Peer Motion on HP LeftHand Storage
Contents
1. e Multi Site Stretched Cluster Replication The LeftHand OS provides all features and management services to e Aggregate physical storage nodes into a scalable pool of clustered resources e Turn raw disk capacity into a fully virtualized iSCSI SAN solution e Provide seamless data mobility services e Scale all available capacity and performance linearly within a cluster LeftHand storage clustering technology provides a grow on demand architecture where storage systems can be added to the cluster as needed without application disruption Clustering features within the LettHand OS include but are not limited to e Addition and removal of storage systems within the cluster e Swapping of all storage systems within a cluster cluster swap e Movement of volumes between clusters e High availability and fault tolerant characteristics of the storage cluster e Automatic restriping of data within storage volumes e Automatic management of iSCSI storage sessions An industry first feature of the LeftHand OS is its Network RAID technology Network RAID delivers volume level data protection which supports high availability and fault tolerance of iSCSI storage volumes This feature also provides builtin synchronous data protection for standard and multi site storage clusters The HP LeftHand Centralized Management Console CMC provides SAN administrators with a single pane of glass dashboard to control and monitor all SAN activities including2. Cluster1 with two P4500 systems added to Cluster1 Swapped This example uses two nodes however up to 16 nodes can be swapped within a single cluster For information about creating clusters and volumes see the HP LeftHand Storage Solution User Manual The example below assumes the HP LeftHand SAN administrator is knowledgeable of LeftHand software and design standards and has experience using the CMC First step is to login to the management group and make certain all storage nodes used during the cluster swap reside in the Managementlest group as depicted in the following use case Cluster Swap Example Step 1 Using the CMC expand the tree and browse down the left hand side of the CMC to the cluster named Cluster1 Select Cluster Right click on Cluster Select Edit Cluster from the pop up window After selecting Edit Cluster select Swap Storage Systems from the popup menu as shown in Figure 6 below Figure 6 Edit Cluster Task Window Fe HP P4000 Centralized Management Console PX File Find Tasks Help Check for Upgrades ag P4500 54 ry x Diagnostics j System Use Remote Snapshots iSCSI Sessions iSCSI Map View T Storage fs Details Use Summary Volume Use a TCPAP Network Cluster Sa ManagementTest s J BES Events Name Clustert F Servers 0 h 3 Administration aa ceca B Sit
3. e Movement of data volumes from mid line or serial attached SCSI SAS to solid state disk SSD storage systems yielding higher input output per second IOPS and smaller data center footprint lower power cooling and real estate while delivering higher O storage system performance How to Perform a Volume Migration Volume migration in HP LeftHand Storage is the process of moving a volume from one LeftHand cluster to another LeftHand cluster a Peer Motion federated concept The movement of a volume between clusters in a LeftHand system requires adding the virtual IP address VIP of the target cluster to the list of target portals on each iSCSI initiator with an iSCSI connection to the volume For Microsoft Windows the virtual IP address should be added to the Microsoft iSCSI Software Initiator portal list prior to moving volumes between clusters to make certain volume migration services are transparent and non disruptive to applications on to be migrated volumes The target portal list on the iSCSI initiator should include at least two VIP addresses e Virtual IP address of source cluster that currently owns the volume s Cluster 1 e Virtual IP address of the target cluster where the volumes are migrated too Cluster2 LettHand volume migration feature is initiated via the Edit Volume menu task in the CMC This feature can be executed with just a few clicks after selecting the volume that will be migrated Figure 1 illustrates th
4. real time execution of Peer Motion features such as volume migration and cluster swap HP Delivers Federated Storage Technology with Peer Motion The concept of federated storage expands the benefits of shared virtualized storage beyond a single disk array to span the entire datacenter and beyond Storage federation eliminates the constraints associated with traditional architectures where data is trapped within the silo of a single monolithic storage array HP LeftHand federated storage allows administrators to manage workloads dynamically providing the flexibility demanded by today s virtualized environments Compared to traditional architectures HP LeftHand federated storage offers the agility to handle performance bottlenecks and capacity crunches associated with the rapidly changing challenges of today s IT infrastructures Storage federation from HP allows administrators to pool resources across the datacenter to optimize ROI from storage technology and drive maximum efficiency from storage resources Peer Motion in HP LeftHand Storage Peer Motion is a data migration technology which offers LeftHand customers two simple and flexible methods of moving data volumes within their LeftHand environment The two methods are e Volume migration e Cluster swap Volume migration and cluster swap employ peer to peer storage federation concepts to seamlessly move application workloads between tiers of data storage or storage clusters within a Le
5. 0 Y Peer Motion and LeftHand VSA Software In federated storage environments infrastructures can be comprised of multiple pools of storage resources and administrators have the agility to move data and workloads across these pools seamlessly With HP Peer Motion LettHand users can create federated storage environments containing a variety of LeftHand plattorms each offering ditferent levels of performance and capacity and have the flexibility to migrate data between all of these resources In many cases this capability can be taken a step further to include other storage platforms by incorporating the HP LeftHand VSA software The VSA software is the LeftHand Virtual SAN Appliance a fully featured version of the LeftHand OS storage software that runs in a VMware vSphere or Microsoft Hyper V virtual machine With the LeftHand VSA administrators can annex non LeftHand storage arrays any block storage device supported by the hypervisor and add these resources to their LeftHand storage federation Most often this is done to allow administrators to repurpose older storage capacity for use as lower tier storage within a LeftHand federation Once a storage resource has been annexed Peer Motion can be used to move data to and from other resources within the environment Similarly cluster swap can be used if the administrator chooses to move data off a cluster of VSAs onto physical LeftHand devices at a later time Keep in mind that data m
6. 2 Volumes 1 and Snapshots 0 RES lov slume 1 0 What is Cluster Swap Cluster swap enables the on line replacement of all storage systems in a LeftHand cluster with another set of storage systems A cluster swap replaces the physical components of a LeftHand cluster while maintaining the logical cluster and the data therein Cluster swap offers LeftHand customers non disruptive builtin and flexible data mobility services With Cluster Swap technology refresh of LeftHand storage can be accomplished with just a few simple steps and no downtime maintenance windows or complex planning Benetits of Cluster Swap A highlighted benefit of cluster swap is the seamless movement of data volumes without disruption to users and or application processing Volume migrations are performed without required changes to network mount points or changes to logical drive mappings eliminating the need for end user reconfiguration Other benefits are e Migration of data volumes from any LeftHand system with a few simple clicks within the CMC e Reduce complex planning and eliminate application I O downtime during storage system consolidations and technology refresh initiatives e Right size LeftHand storage clusters atwill while preserving application service levels When to use Cluster Swap Use the cluster swap feature to seamlessly swap out all LeftHand nodes in a cluster at once Common use cases for cluster swap are e Refresh storage te
7. Laas ED i TCPAP Network el Ha Volumes 3 and Snapshots 0 zji mr After selecting the OK button in Step 5 the program returns to the main CMC The left side of the CMC navigation window now shows Cluster1 with two P4500 nodes The P4300 nodes P4300 S1 and P4300 S2 still reside in the ManagementTest group but are not associated with Cluster1 as shown in Figure 11 below Figure 11 Storage Systems Window Fe HP P4000 Centralized Management Console ax File Find Tasks Help Check for Upgrades gt Configuration Summary re FH Available Systems 2 Storage Systems 2 Ee P4500 S3 a gt gt a ae as T 7 HA Diagnostics i Name IPAddress Model Manager Special Manager RAID Status RA iJ Storage P4500 52 192 168 113 51 P4500G2 Normal Normal R OS TCPAFP Network amp P4500 S1 192 168113 50 P4500G2 Normal Normal R E P4500 54 fre Diagnostics g Storage TCPAP Network Hi ManagenentTest HH P4300 S2 H P4300 51 HE Events 4 m fis Servers 0 g gt S Administration L Sites Storage System Tasks He P4300 53 Alarms 0 S Clusteri me Performance Monitor Status Normal Fitter Alarms FH Storage Systems 2 Hee P4500 52 Severity Y Date Time Event Message Type Name ae initial Alarm Tasks Hae Volumes 3 and Snapshots
8. S1 and P4500 S2 and then click the OK button 11 12 Figure 9 Add Storage Systems to Swap Window FHP P4000 Centralized Management Console File Find Tasksy Help Check for Upgrades e P4500 S4 ra Fe Add Storage Systems to Swap Ed in Diagnostics r 5 i Storage Add storage systems to swap into the cluster gia TCP IP Network Select storage system s to swap into the cluster You must add the same number of storage systems to each site in Multi Site EA ManagementTest clusters Seic 0 Name J IP Address Model Manager Special Manager RAID Status Se Administration P4300 53 192 168 113 776 P4300G2 Normal Normal Sites P4500 S1 192 168 11350 P4500G2 lt Normal Normal p4500 S2 4192168 113 51 P4500G2 Normal Normal P4500 S1 P4300 51 19216811387 P4300G2 Normal Normal ae P4300 S4 r4300 S2 19216811384 P4B00G2 Normal Normal Clusteri Performance Monitor Storage Systems 2 Ee P4300 S2 TE Diagnostics I Storage TCPAP Network P4300 S1 m Diagnostics TI Storage A TCP IP Network H Volumes 3 and Snapshots 0 v IIll Note The list above includes P4300 and P4500 systems A HP LeftHand best practice is to group systems within the same P4000 platform same capacity and disk technology when adding systems to a cluster In our example we selected two P4500 systems The P4300 nodes removed from Cluster1 in Step 2 are available systems in th
9. Technical white paper Peer Motion on HP LeftHand Storage Table of contents An Introd ction to HP LefHand IORI 6 sic 8 ace cas eee aes oe naere eee ebaceh ded ennai esaia 2 HP Delivers Federated Storage Technology with Peer Motion cccccccceessseeeeeceeeeeesseeeeeeeseesssaeeseeeeees 3 Peer Motion in HP LeftHand Storage ascnsse lt sccenume vaceseasacsacennaondsd aneneccauesagesanagandaeeseactoateradenioesnsadaveress 3 Peer Motion Benefis scene cried acon tete oiri E E A E a i 3 What is Volume Migration ecrs tracts cteusesnaersaancweredeisndanunanswbcthsaenueae asec dinsine sin evotroncuadaabenieiesuesteaturcseresaened 4 Benefits of Volume IVIQMAIION sgs ctshaatenenscdtessebacdoateadacce lt tanctateeiobseloatsndestastahaatapensctoesnaadentartasactentebsa 4 When to Use Volume Migrations ae2s tac cadeas sedeonadisaunaasoncuadsanseuinewssaqaetagaedcnndadee cenaeensitedneneacenbedcences 4 How to Perform a Volume Migration ccccceeeeccccccceeeeeeeeeessseeeeeeeeeeeeeeeeeeseeeeeaasssaaeeeeeseeeeeeeeess 5 What is Cluster SWOOP isoset na iE E ii 8 Been S Or CCS o WOD eea E E tose aces amneaameaconeeee eis acctaatsaamens 8 When touse Cluster SWOD ae ane Aneto enn fe nan ete eet ae me eee eee ne ene eer 8 How to Feror a UWS eh Swappers ere ten tee eee mers ssear rE T EEE 9 CISION WENO 8 SKS ae E E EE E E REE EE E 9 Working Example of GlOsien Wap errer aaa E E AEN 10 Cluster Swap Example scncAcsrasinorsacene apensoueeeounnencneserasiat
10. chnology of any LeftHand platform e Upgrade all storage systems in a cluster to a higher performing or capacity storage tier e Downgrade all storage systems in a cluster to a less expensive storage tier How to Perform a Cluster Swap Cluster swap a Peer Motion feature can be executed in as few as six clicks starting with the Edit Cluster menu option within the CMC after selecting the cluster of choice within the appropriate management group The cluster swap operation should be used by customers when they want to upgrade and or replace all storage systems within a cluster with a new set of systems Volumes striped across all storage systems within the selected cluster are seamlessly migrated to new storage systems added during the cluster swap operation The LeftHand OS maintains data volume consistency while restriping data blocks from current storage systems to the new At the time the cluster swap is initiated all iSCSI sessions as well as the cluster Virtual IP address VIP are migrated to the new nodes Client read and writes operations are handled transparently by the LeftHand OS during the swap operation Read I Os are processed by the old or new storage nodes depending on whether the particular data blocks have been migrated write I Os are processed by newly added storage nodes The cluster swap operation automatically removes the old storage systems from the cluster thus allowing these systems to be repurposed immediately after the
11. cluster swap operation finishes Steps below describe CMC tasks required to execute a cluster swap Cluster Swap Tasks Select the cluster of choice from the navigation window as shown earlier 2 Click Cluster Tasks next select Edit Cluster and then select Swap Storage Systems A Swap Cluster Storage Systems popup window appears 3 Select all the storage systems listed in the Swap Cluster Storage Systems popup window next click the Remove Storage Systems button The selected storage systems are removed from the list 4 Next click Add Storage Systems The Add Storage Systems window opens with all the available storage systems in the management group 5 Select the storage systems to swap into the cluster and click OK 6 Next click OK again within this window to complete the swap The cluster swap operation varies in time and has a dependency upon but not limited to e Network RAID level of each data volume migrated e Amount of data required to be restriped e O workload number of users actively reading and writing data from volumes e Network throughput available bandwidth for iSCSI traffic within the local storage network as well as interconnects for multi site cluster swaps e Bandwidth priority value set within the management group This setting is use to determine the maximum bandwidth allocated to the cluster swap versus application processes this may be adjusted at any time to speed up or slow down the cluster swap ope
12. e Add Storage Systems to Swap list The P4300 nodes removed during Step 2 should not be selected during the Cluster Swap operation Step 5 The pop up window below is asking for confirmation of the nodes selected in the window below Select the OK button to complete the Cluster Swap activity or select the Cancel button to cancel the Cluster Swap activity and return to the last known state of Cluster1 Figure 10 Swap Cluster Storage Systems Window FHP P4008 Centralized Management Console BE Filey Find Tasksy Help Check for Upgrades Se Fis00 s4 Seap Clusterstoragesystems ga Diagnostics 1J Storage s TCPAP Network ee ManagementTest Swap storage systems in the cluster for available storage systems B Events Remove storage systems from the cluster by selecting storage systems from the table below and then clicking Remove mial Servers 0 Storage Systems Add storage systems to the cluster by clicking Add Storage Systems and then selecting storage Administration systems that are available in the management group E Sites 3 p4500 S2 Name IP Address Model Manager Special Manager RAID Status a P4500 51 P4500 S2 192 168 113 51 P4500G2 Normal Normal eas P4500 51 192 168 113 50 P4500G2 Normal Normal E S Clusteri 2 Performance Monitor H Storage Systems 2 He P4300 S2 q Diagnostics K II Storage a TCP IP Network Ee P4300 S1 E i Ca Diagnostics
13. e and enterprise customers dynamic resource leveling capabilities across LeftHand platforms These capabilities offer users a scalable means of matching shifting application demands to the appropriate performance and capacity resources of federated LeftHand storage Volume Migration is an HP Peer Motion technology built in to every LeftHand storage system to deliver e Ease of use dynamic volume tiering Flexibility on line movement of volumes between clusters Scalability rebalancing of data volumes to higher performance or capacity storage tier and vice versa Agility resilient storage infrastructure as easy as choosing the site cluster and platform to tier to High availability offers continuous online volume access for both standard and multi site LeftHand clusters When to Use Volume Migrations Practical use cases for resource leveling utilizing volume migration features are described and categorized below Capacity use case e Movement of volumes from an over provisioned LeftHand storage cluster to a higher capacity LeftHand peer cluster e Movement of data volumes to larger capacity storage systems such as LeftHand P4800 storage thus enabling linear scale out of compute and storage within HP BladeSystem environment Performance use case e Alignment of data volumes to accommodate the input output I O usage requirements of applications movement of data to any LeftHand cluster capable of higher performance as needed
14. e bandwidth priority setting See figure 12 below controls the duration and performance impact of the restripe associated with the cluster swap The restripe process may take several hours or days depending on the amount of data required to restripe and the amount of bandwidth allocated to restripe activity Setting the bandwidth priority control setting greater than 40 MB megabytes per second may impact volume availability Figure 12 Bandwidth Priority Setting Control Window Fre Edit Management Group Group Name ManagementTest Group Mode Normal Mode Local Bandwidth Priority Bandwidth Priority 16 MB sec How Do Set My Bandwidth Priority 0 25 10 16 20 30 Application Data Rebuild Access Remote Copy Targets Remote copies from this management group ManagementTest go to the remote management groups listed in the table Management Group Remote Bandwidth Connected e If using the HP LeftHand DSM for Windows MPIO there needs to be at least one storage system in the management group that is not assigned to the cluster If there are no other nodes in the management group users may add an HP LeftHand VSA to serve this purpose The VSA can be downloaded free of charge at www hp com go tryvsa VSAs used for this purpose should be removed from the management group when the cluster swap is complete Summary Peer Motion is a builtin data mobility feature provided at no extra cost within the all inclusi
15. e ease of using the graphical user interface of the CMC to select a volume Volume 1 to migrate from Cluster to Cluster2 within the same management group Figure 1 Edit Volume Menu Fe HP P4000 Centralized Management Console File Findy Tasks Hepy Check for Upgrades EH ManagementTest eE Events Details Snapshots Remote Snapshots _ Schedules _ Assigned Servers _ iSCSI Sessions _ Map View Es Servers 0 Volume g Administration Sites Name Bio Volume 1 S Cluster a Performance Monitoi FH l Storage Systems 2 Cluster Cluster EH P4300 51 FA Diagnostics UJ Storage Server a TCPAP Network P4300 S2 r Type Primary Description Status Normal p Piagnosiiks Reported Size 100 GB Wg 8 Storage L TCPAP Network Data Protection Level Network RAID 10 2 Way Mirror EH Volumes 3 and Snapshots 0 Bho Volup o gin Vol New Snapshot Provisioning Full Created 3 9 12 8 36 56 PM GMT Consumed Space 200 00 GB Created by Manual fio Volul New Schedule to Snapshot a Volume LS Performance New Schedule to Remote Snapshot a Volume Storage Sys H P4500 5 e P4500 9 Assign and Unassign Servers Qantas Alarm Tasks Volumes 0 Edit Volume S Cluster2 New Remote Snapshot a Alarms 0 New SmartClone Volumes Status Normal Fitter Alarms Delete Volume Listed below are the necessar
16. eaaosa outa dneseocnouastuuhonieteebedeussueaasweteebeesanen s 10 Peer Motion and LeftHand VSA Software cccccccsccccccccceeeeeeeeeesseeeeeeeeeeeeeeeeeeeeeeesssaaaeeeseeeeeeeeeeess 13 VSA annexing USC COSC usurintei senkon annua set EE ENE na E e Ea aE bea a aana EAE 13 Benefits of VSA CNMC IG ee cesecaeecasameuacessoceepanescedeerasncendarsoctunanascedaterasaeandianetesmoneedssaenodeestianctaeead 13 Best Practices for Peer Molon asec caecage rt eeat dae i osc fanbe ed dace E E a SA E 14 INO a E E A T E E EE E E E T 15 Frequently asked questions ssonnnnnnesssessnnnnnnsssssteeeerssstrinrsssssrrrenersssssrrrerrsssssrrensssssrrrrersssssrererno 16 An Introduction to HP LeftHand Storage HP LeftHand Storage is a highly scalable highly available iSCSI storage solution LeftHand s scale out architecture allows customers to consolidate storage nodes into pools of shared storage clusters All available capacity and performance is aggregated and available to every volume in the cluster The LeftHand operating system LeftHand OS has built in disaster recovery and high availability clustering features HP combines the intelligence of the LeftHand OS with industry leading ProLiant servers to deliver a full featured all inclusive enterprise iSCSI SAN solution Enterprise features of the LeftHand OS are e Storage Clustering e Network RAID e Thin Provisioning e Snapshots and Clones e Disaster Recovery e Centralized Management
17. es Status Normal Ha P4500 S2 P4500 51 Type Standard to eax Best Practice amp 0 4 T p New Volume Disk RAID Consistency gt EH S Edit Cluster p Edit Cluster Properties Cluster Level Data Protection Delete Cluster Add Storage Systems D Remove Storage Systems Seren orerage _ Alarms 0 ae amp TOPAP Netw Exchange Storage Systems E p4a00 51 Swap Storage Systems Status Normal Fiter Alarms TE Diagnostics Reorder Storage Systems igd Storage Egit Wirtual IP Addresses Severity Date Time Event Message Tve Name is TCRAP Netw Edit iSNS Servers Alarm Tasks HH Volumes 3 and Sna parorsto Step 2 Using the Swap Cluster Storage Systems pop up window select all HP LeftHand P4300 storage systems in the list After selecting all nodes in the list click the Remove Storage Systems button o nmm d em ndex Figure 7 Swap Cluster Storage Systems Window Fe HP 4000 Centralized Management Console File Find Tasks Help Check for Upgrades a P4500 S4 Fe Swap Cluster Storage Systems BS fx FA Diagnostics Storage TCPAP Network Swap storage systems in the cluster for available storage systems oy ManagementTest As Events Remove storage systems from the cluster by selecting storage systems from the table below and then clicking Remove Storage i Serverg 0 Systems Add storage systems to the cluster by clicking Add Storage S
18. ftHand environment Peer Motion in HP LeftHand supports all LeftHand platforms ranging from the VSA to the midrange and high performance storage systems Peer Motion enables dynamic resource leveling of LeftHand storage volumes without storage downtime or maintenance window outage Resource leveling for LeftHand systems is quick easy and executed within a few simple steps thus helping to reduce the need for long term storage planning and complicated budget forecasting Peer Motion Benefits e Offers data and workload movement between storage clusters to address performance and capacity requirements e Enables seamless LeftHand storage technology refreshes eliminating downtime and or service interruption during migration upgrade activities e Promotes federated asset management by moving data from retiring storage arrays to new storage systems non disruptively e Allows flexible migration of data volumes between multi site clusters to align with the growing demand for cloud based storage e Enables clients to transparently move application workloads between storage tiers in virtualized and cloud computing environments e Increases return on investment by combining HP thin provisioning and volume migration technology Peer Motion supports volume migration for full and thinly provisioned LeftHand volumes Peer Motion preserves the provisioning method full or thin associated with existing volumes during data migration services and su
19. grated volume Figure 4 Edit Volume Menu with Warning f w Edit Yolum f HP P4000 Centralized Management ons e L Ta anida aL Centralized Management Console WARNING Migrating volume Volume 1 to cluster Cluster2 may require that you modify the Virtual IP VIP and or the iSCSI initiator IP address information associated with this volume After migrating ensure that these settings are correct for your new configuration Are you sure you want to migrate this volume To continue with the operation click OK To exit the operation without making changes click Cancel EZ i 7 Sending command edit a volume to manage After selecting OK in Step 6 the program returns to the main CMC The restriping status of the migrated volume is shown in Figure 5 below The Details Tab of a selected volume provides status information Figure 5 Volume Property Menu Fe HP P4000 Centralized Management Console Filey Find Tasks Help Check for Upgrades Getting Started St configuration Summary Available Systems 6 P4300 S11 P4300 S12 fig Volume 1 P4300 S3 P4300 S4 VSA1 Cluster2 oe Restriping 45 63 seconds remaining Restripe pending because of cluster edit or migration te 192 168 113 100 Servers 1 S Administration Primary lt 2 Performance Monitor Storage Systems 2 a Volumes 2 and Snapshots 0 Gio Volume 2 0 ig Volume 3 0 Cluster2 2 Performance Monitor tHe Storage Systems
20. nagement group as shown in Figure 2 Step 5 Select the name of the cluster i e Cluster2 where the volume will be migrated to then click OK as illustrated in Figure 3 Figure 3 Edit Volume Menu Advance Tab FHP 24000 Centralized Management Console lolx j 7 Eile Find Tasks Help Check for Upgrades Advanced D Chintor a Data Protection Level Network RAID 10 2 Way Mirror x nd Spas Provisioning are Full 144212 11 11 19 Type Primary Remote B Full 10242 11 19 12 Thin 1242 11 19 46 Basic f SAN Status Page Getting Started Ost Configuration Summary Available Systems 2 oH ManagementTest a Events SA Servers 0 w Administration e Sites P4300 53 Cluster1 Performance Monitor Ebi Storage Systems 2 P4500 S2 P4500 S1 L Volumes 3 and Snapshots 0 Bio Volume 1 0 Bo Volume 2 0 Bio Volume 3 0 SS Cluster2 Provisioning Full Thin li Type Hame Component ER A sll a wes Step 6 A popup window with a warning message appears click OK again within this window to complete the last CMC task for this volume migration process If necessary repeat steps 1 6 above to migrate additional volumes to the target cluster Warning Message After the volume migration has completed check client iSCSI setting to make certain the data volumes are properly mapped to appropriate cluster that owns the mi
21. pports migration of data within e Volumes e Snapshots e SmartClone volumes What is Volume Migration HP s Peer Motion volume migration service is the online movement of any LeftHand volume between different tiers of storage systems and or clusters Volume migration enables the movement of data volumes between LeftHand storage clusters while preserving application access to the storage iSCSI sessions are automatically redirected to the new cluster when the migration is initiated and application access is maintained throughout the process The data restripe rate rate at which data is moved to the new cluster can be managed by the administrator to control the resources allocated to data migration and limit any potential impact on performance Peer Motion volume migration provides customers a scalable tiered solution to align virtualized and cloud based compute requirements with customer s most appropriate and cost effective storage resources Benefits of Volume Migration Peer Motion volume migration allows administrators to rapidly respond to changing workload and capacity requirements by seamlessly moving an application to a tier of storage with a higher performance profile or a cluster with more available capacity In contrast to legacy storage designs these migrations can be performed online without downtime or complex planning activities Combined with the LeftHand scale out architecture volume migration offers small midsiz
22. ration Adding storage systems using cluster swap feature is not the same as adding or removing new storage systems to expand or reduce the storage capacity of a cluster Cluster swap is used as a means to replace all LeftHand storage systems residing in the cluster at one time using the remove and add functions of the swap storage systems menu option NOTE Adding new storage systems to a cluster swap causes a restripe of all data volumes in that cluster The restripe process is transparent to the end user and may take several hours or days depending on the amount of data required to restripe Swapped storage systems cannot be removed from the management group until the restripe process is complete 10 Working Example of Cluster Swap To illustrate how Cluster Swap works we will walk through an example of moving all data volumes from a LeftHand P4300 storage cluster to a higher performance cluster All storage nodes in this example are running the latest version of LeftHand software and reside in the same management group The name of the management group is Managementlest In this example the two P4300 storage systems are members of a standard cluster configuration The cluster s name is Cluster1 A failover manager is used in this 2 node cluster and has been added to the Managementlest group to serve the role of quorum tie breaking manager The following figures illustrate the replacement of two P4300 storage systems in
23. storage system to another varies The variance in time depends on the size and capacity of data volumes the amount of application workload shared in concert with volume migration activities and network bandwidth Refer HP technical white paper titled the Architectural Advantages of HP P4000 SANs for guidance on LeftHand network best practices What is the minimum number of nodes supported for a cluster swap A two node cluster is the minimum redundant cluster swap configuration plus a failover manager running on a separate server Is cluster swap supported on VSA software appliances Yes It is support across all HP LeftHand Storage platforms Is cluster swap supported on mixed VSAs and physical LeftHand storage system clusters Mixing of VSAs and physical platforms is not a best practice or supported LeftHand design A cluster swap of heterogeneous LeftHand nodes yields unpredictable performance results in a mixed cluster scenario performance is an average of all storage systems within the cluster What happens to the storage systems that were removed from the cluster during the cluster swap operation The prior storage systems are removed from the cluster however remain in the same management group These nodes can be reused after all data volumes have been migrated to the new cluster completing the cluster swap Is the HP Device Specific Module for Multipath 1 O MPIO supported with Peer Motion Yes the DSM is supported with Peer Mo
24. tion As noted in the Best Practices section above when performing a cluster swap with DSM it is required to have at least one additional node in the management group that is not participating in the swap hp com go getconnected Current HP driver support and security alerts delivered directly to your desktop Copyright 2012 Hewlett Packard Development Company L P The information contained herein is subject to change without notice The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services Nothing herein should be construed as constituting an additional warranty HP shall not be liable for technical or editorial errors or omissions contained herein 4AA4 0304ENW Created April 2012
25. ucture 13 14 Best Practices for Peer Motion The section to follow provides best practice considerations for planning design and implementing a LeftHand standard or multi site cluster swap Considerations are Make certain storage nodes added to the cluster during a cluster swap adhere to HP LeftHand software and hardware prerequisites Cluster Swap prerequisites are the same LeftHand prerequisites that one would consider when adding removing or exchanging storage nodes within an existing standard or multisite cluster Reference the P4000 SAN Solution User Manual to guide standard and multi site cluster configuration prerequisites Storage nodes added to a cluster during a cluster swap must be running the same version of the LeftHand OS as the storage nodes currently residing in the cluster Check that the storage systems clusters are in a good state with no critical events Run hardware diagnostics in the LeftHand CMC for all nodes that will be participating in the cluster swap All storage nodes participating in a cluster swap need to be assigned to the same management group and appropriate site Make certain your cluster swap adheres to the recommended number and type of running configuration managers The end state of a cluster swap requires a minimum of two storage systems and three running configuration managers For storage nodes less than 3 use a failover manager The failover manager serves as a quorum tie breaker Systems
26. ust be deleted or migrated off of the external storage before the VSA can make use of the capacity Also performance of a disk system or array annexed by VSA may not be equivalent to the native performance of that system or array VSA annexing use case e Repurpose legacy and or disparate storage arrays to HP LeftHand Storage e Consolidate disparate storage arrays under a single management console LeftHand CMC e Create a DR site by installing VSA on a legacy array at a DR location and replicating to it from primary LeftHand array using LeftHand Remote Copy e Manage and unify different storage transports like iSCSI FC SAS from legacy and third party storage systems to the iSCSI technology of HP LeftHand Storage Benefits of VSA annexing An industry leading benefit of VSA Annexing is the means to repurpose aggregate and virtualize storage capacity of heterogeneous storage systems arrays together into shared pools of LeftHand storage Other benefits are e Repurpose retired aging storage systems into new storage tier reducing CAPEX cost e Convert retired storage systems into a virtualized storage tier for test and development environments Eliminate volume migration boundaries between LeftHand and other third party storage systems Create federated storage using Peer Motion on LeftHand to seamlessly move VSA connected volumes to any physical LeftHand platform thus enabling a resilient flexible and agile virtualized SAN infrastr
27. ve LeftHand software suite Key features of Peer Motion are volume migration and cluster swap These features have been enhanced throughout HP LettHand s product lifecycle offering customers the simplicity and agility needed to architect and design a flexible federated SAN solution Through features such as Peer Motion customers have better storage resource alignment with their business and application needs while enabling data mobility to support convergence federation and cloud based storage solutions and creating the building blocks of the next generation IT as a Service model Peer Motion software delivers non stop availability for small mid range and enterprise customers desiring a scalable SAN architecture that is flexible resilient and easy to manage la Get connected Frequently asked questions Can one use the cluster swap task to exchange storage nodes within a cluster Yes The option can be used to add or remove individual storage systems within a cluster however a Cluster Swap implies the replacement of all nodes within the cluster A best practice recommendation is to use the appropriate option which is the Exchange Storage System task to add or remove exchange individual storage systems within a cluster How much time does it take for HP LeftHand Storage to complete a cluster swap operation The cluster swap operation can be completed in a few minutes However the time required to migrate all volumes from one
28. within a cluster should be from the same LeftHand platform as well as populated with a homogenous group of disk drives The storage capacity of a cluster is derived using the drive capacity of the smallest disk within the storage systems cluster Storage systems added to a management group inherit all characteristics and attributes of that management group including Domain Name Services DNS Simple Mail Transport Protocol SMTP Network Time Protocol NTP and more Inheriting these attributes promotes a non disruptive and seamless migration of data volumes without loss of user and or application connectivity Make certain storage systems swapped during the cluster swap process are sized properly to accommodate the capacity and Network RAID levels of all data volumes to be migrated Check that all storage systems participating in the cluster swap are reachable via the IP network Ensure that the hardware disk RAID settings network properties frame size and flow control and network bonding settings are properly configured on all nodes before initiating a cluster swap Keep in mind volume migration during a cluster swap requires restriping of all block data onto newly added storage systems Consider using the local Management Group bandwidth setting within CMC to control bandwidth during data migration activities This setting is used to determine the maximum rate per second allocated to non application processing tasks such as data restripe Th
29. y steps to move a volume from one cluster representing one tier of storage to another cluster using the LeftHand CMC Moving a volume between clusters is executed in as few as six easy steps Step 1 Select the volume of choice from the right navigation window as illustrated in Figure 1 above Step 2 Right click and then select Edit Volume from the menu option The Edit Volume menu popup window is displayed as shown in Figure 2 below Figure 2 Edit Volume Menu FHP P4000 Centralized Management Console fw Edit Volume gt mia x Filey Find Tasks Help Check for Upgrades Basic Advanced eee tut SAN Status Page 2 E bats Sete Cluster c Configuration Summary Cluster1 ed Spa Provisioning Created f Available Systems 2 Data Protection Level x Full qn2n24444 49 ManagementTest ap a Fa ats Type t Primary Remote BB Full 14242 11 19 12 ea pK Thim 14242 11 19 46 j Ser paa 0 Provisioning Full Thin H S Clusteri Performance Monitor H Storage Systems 2 P4500 S2 P4500 51 _ amp Volumes 3 and Snapshots 0 Bio Volume 1 0 Bio Volume 2 0 Bio Volume 3 0 Sta rite Cluster2 p E Tve Name Component 4 Iii Step 3 Select the tab titled Advanced from the Edit Volume popup window as shown Figure 2 Step 4 Next select the Cluster drop down list The list includes all available storage clusters within the same ma
30. ystems and then selecting storage systems that are available in the management group Storage Systems 2 P4300 S2 Diagnostics 1 Storage TCPAP Network P4300 S1 Diagnostics Storage TCPAP Network Volumes 3 and Snapshots 0 Step 3 After clicking the Remove Storage Systems button a pop up window displays with an empty list Next select the Add Storage Systems button Figure 8 Swap Cluster Storage Systems Window HP P3000 Centralized Management Console File Find Tasks Help Check for Upgrades P4500 54 Fx Swap Cluster Storage Systems Diagnostics Storage TCP IP Network aw ManagementTest Swap storage systems in the cluster for available storage systems Remove storage systems fromthe cluster by selecting storage systems from the table below and then clicking Remove Storage Systems Add storage systems to the cluster by clicking Add Storage Systems and then selecting storage systems that are available in the management group IP Address Manager Special Manager RAID Status Performance Monitor Storage Systems 2 Fy Di 52 gore poe TCPAP Network P4300 S1 3 Diagnostics ip TCPAP Network tH l Volumes 3 and Snapshots 0 Ae Storaje Systeme Step 4 The Add Storage Systems to Swap pop up window appears with a list of all storage systems available to be swapped into Cluster1 In this example we selected two nodes P4500
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