Compaq Computer Corporation
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1. Compag Computer Corporation Project Audience Project Specifications Personal Responsibilities Attached Sample At Compaq Computer again created documentation for two Storage Network Products The Compaq Array Controller Software Solution kit enables the user to define set up and manage large storage systems Secure Path is a server based software product that provides path management from server to storage system Its main feature is that it routes I O from failed path to active or passive paths This intended audience for these documents was individuals responsible for installing and configuring Compaq Storage Network products created the following documents during my contract with Compaq StorageWorks e For the Compag Array Controller Software Solution kit created 18 Installation Guides and 18 Application Notes for two controllers and nine operating systems Using FrameMakers conditionalized text feature worked with only two source files one for each controller for each document Each Installation Guide was approximately 200 pages Each Application Note was approximately 50 pages e For Secure Path created 9 Installation Guides and 9 Application Notes again using FrameMaker s conditionalized text feature Each Installation Guide was approximately 100 pages Each Application Note was approximately 30 pages e For Secure Path created a documentation plan that contained scheduling and other d2. O and detecting path failures Secure Path Manager SPM is a web based management utility capable of cross platform Secure Path configurations This utility displays a graphical representation GUI of multiple path configurations indicating status of a user defined set of hosts storage systems and paths SPM coexists with other Compaq utilities such as Compaq Insight Manager StorageWorks Command Console and Enterprise Volume Manager EVM SPM enables you to efficiently manage your storage systems in the following ways Displaying all current path states Providing remote notification of critical events via paging or email Secure Path Agent is a Windows service that communicates with the RaiDisk filter driver on the host server and Secure Path Manager on the client side using the TCP IP protocol and WinSock API The agent installs on the host server along with the RaiDisk driver To minimize network traffic display information is relayed from the Secure Path Agent to the Secure Path Manager only when the RaiDisk driver detects changes in the configuration The Secure Path Agent also notifies StorageWorks Command Console SWCC clients when RaiDisk performs path failover or auto failback operations Secure Path Setup supports driver and application installation and de installation with Windows NT 4 0 and Windows 2000 Secure Path Version 4 0 for Windows Installation Guide 1 3 Secure Path Technology Configuration L
3. e Preferred path becomes Active Path Management Behavior Summary Table 1 1 provides a summary of path management behavior conditioned by the optional features of Secure Path Table 1 1 Path Management Behavior Summary Behavior Action The path to the controller on which the LUN is online is marked preferred active The path to the other controller is marked alternate available If no online path is found an available path online is marked as preferred active and the other path is marked alternate available Active Path Path marked preferred or alternate failed and fails to Failure alternate available path Alternate available path used is marked alternate active Behavior is the same with I O or background path verification If LUN is reserved mark path failed but do not fail to other path on nonowning node 1 12 Secure Path Version 4 0 for Windows Installation Guide 2 Hardware Setup This chapter provides the following Secure Path hardware setup information e Fibre Channel Configuration Installation Prerequisites e Installing a New RA8000 ESA12000 Secure Path Configuration e Adding Secure Path to an Existing RA8000 ESA12000 Configuration Fibre Channel Configuration Installation Prerequisites Before installing Secure Path on a new or existing Fibre Channel FC configuration first review the RA8000 ESA12000 High Availability Application Notes found on the Compaq web site They will famil
4. e Path SANworks Secure Path v3 1 Enterprise Edition for Microsoft Software Kit Windows QB 669AD SA RAID Storage StorageWorks dual redundant RA8000 ESA12000 FC System s Solution Software Kit StorageWorks Command Console Host Bus Adapter s and adapter driver FC Interconnect StorageWorks Solution Software V8 6 for Windows NT QB 65RAE SA Storage management software Supported model for Windows NT Intel StorageWorks KGPSA FC hubs switches and connection hardware as required Hardware Application Notes provide detailed equipment part numbers Service Tools Appropriate tools to service the equipment Technical The reference guides for the RAID system the host server Documentation and the Microsoft Windows software 2 2 Secure Path Version 3 2 for Windows Installation and Reference Guide Hardware Setup Installing a New RA8000 ESA12000 Secure Path Configuration This section provides procedures to install and configure a Secure Path topology for new FC RA8000 ESA12000 Secure Path configuration It contains the following major steps Install and check status of hardware Configure the RAID system for Secure Path operation Install server software Shutdown restart and hardware applications Check for successful restart Install and Check Status of Hardware 1 Install all of the new RAID storage system and FC interconnect hardware hubs switches and cabling according to the instructions pr
5. ginal NOTE MSA1000 is the only controller that uses the active passive model e Active active In the active active model I O processing may be routed through both controllers simultaneously providing better performance in addition to high availability The RAID Arrays supported by Secure Path implement a modified version of the active active model While I O can be processed simultaneously by both controllers any given storageset is owned or online to a host through only one controller Ownership of a storageset may be transferred to the other controller at any time through a host initiated command sequence 1 4 Secure Path Version 4 0 for Windows Installation Guide Secure Path Technology Path Verification When enabled with the Secure Path Manager Path Verification causes Secure Path to periodically test the viability of all paths to all storagesets for paths marked Available Failed or Active Path Verification does not test paths that are in a offline mode Path Verification is useful for detecting failures that affect overall path redundancy before they affect failover capability e Ifa Preferred path fails path verification failover occurs e Ifan Alternate path fails path verification its state will change from Available to Failed e Ifa path marked Failed passes path verification the Path State is set to Available If auto failback is enabled th
6. iarize you with various high availability connection layouts for FC devices and cabling The application notes present a topological layout of several high availability options They also list part numbers related reference documentation and discuss restrictions that apply when Secure Path co exists with MSCS software and FC hardware devices The High Availability Application Notes for FC installations are RA8000 ESA12000 FC AL High Availability AA RHOSE TE Configurations for Windows NT Intel RA8000 MA6000 MA8000 ESA12000 and AA RHH6D TE EMA 12000 FC Switch High Availability Configurations for Windows NT Intel NOTE For the most current Application Notes visit the Compaq website at www compaq com products storageworks Secure Path Version 3 2 for Windows Installation and Reference Guide 2 1 Hardware Setup Components Required for RA8000 MA6000 MA8000 ESA12000 and EMA12000 Fibre Channel Installation Verify receipt of the Secure Path software kit and the FC hardware ordered for the installation If you are missing any component please contact the account representative or call the Compaq Customer Services Hotline at 800 354 9000 The basic requirements for Secure Path operation are listed in Table 2 1 Table 2 1 Secure Path FC Installation Prerequisites Host Feature Requirement Platform Intel Operating System Windows NT Enterprise Edition Version 4 0 Windows 2000 Advanced Server Edition Secur
7. imitations Secure Path Manager uses the concept of profile to express a working configuration limit Large configurations can be managed through a single instance of the Secure Path Manager However there are certain practical limitations on the configuration size that can be displayed and managed in a single graphical window The Secure Path Manager profile limits are e A maximum of 128 servers host systems e Connected to and sharing up to 128 storage systems e Configured for multiple bus failover mode Secure Path does not provide any mechanism for synchronizing access to or guaranteeing the data integrity of storagesets shared across multiple standalone hosts or clusters Access to storagesets is restricted to a single standalone server or a single clustered host set The Secure Path Manager enables you to create multiple profiles stored as separate files in the same directory Any given server cluster or storage system may exist in multiple profiles as long as the profile configuration rules described above are followed Controller Ownership Storage systems that are multiple bus capable generally contain a pair of redundant controllers and support one of the following basic operational models e Active passive In the active passive model all storagesets are assigned ownership to one controller of the pair for I O processing The other controller is inactive but available as a substitute in case of failure on the ori
8. lowing host operating systems e Windows NT Server 4 0 and Enterprise Edition e Windows 2000 Server and Advanced Server e Windows 2000 Datacenter Advanced Server SANworks Secure Path for Microsoft Windows provides support for the following storage systems e Enterprise V1 0 e RA MA8000 Secure Path Version 4 0 for Windows Installation Guide 1 1 Secure Path Technology ESA EMA12000 MSA1000 MA6000 Use the SANworks Secure Path software with StorageWorks RAID Arrays configured to operate in any of the following high availability environments Windows NT 4 0 operating systems using Intel based platforms Windows 2000 operating systems using a single host server Microsoft Cluster Server MSCS Oracle Parallel Server OPS Features Secure Path provides the following features Allows StorageWorks dual controller RAID systems and host servers equipped with multiple HBA redundant physical connectivity to operate along independent Fibre Channel Arbitrated Loop FC AL or SAN switched fabric paths Monitors each path and automatically re routes I O to a functioning alternate path if an HBA cable switch or controller failure occurs Determines the status of physical paths through the implementation of path verification diagnostics Monitors and identifies failed paths and failed over storage units Automatically restores failed over storage units to repaired paths with auto failback capability enabled Continuously moni
9. ocumentation information for the project jumped into the Compag Array Controller Software Solution software project knowing very little about the product Within a short period of time was required to create 36 documents For accomplishing this feat was giving an employee excellence award For the Secure Path project was not only responsible for creating the documents but also attended team leaders meetings and created document schedules which were constantly being adjusted The attached sample is an overview of the Secure Path technology It includes features and operation summaries 1 Secure Path Technology Compaq SANworks Secure Path is a server based software product that enhances StorageWorks RAID Array storage systems by providing automatic path management from server to storage systems during connection failures Secure Path supports multiple I O paths between host and storage which improves overall data availability If any component in a path between host and storage fails Secure Path redirects pending and subsequent I O requests to an alternate path This chapter provides the following Secure Path information e Features e Software Components e Configuration Limitations e Path Status e Failover Operation e Path Management Behavior Summary Overview Compaq SANworks Secure Path for Microsoft Windows is a high availability software product that manages and maintains continuous data access to the fol
10. ovided with the installation documentation shipped with the FC equipment Establish a serial link to the RAID system using a serial line connection from the host server or from any PC workstation Obtain RAID controller status using the StorageWorks Command Console SWCC Command Line Interface CLD or a terminal emulation program such as HyperTerminal Configure the RAID System for Secure Path Operation 4 Using the CLI complete one of the following substeps to configure the RAID system for Secure Path operation a For FC AL configurations set the Arbitrated Loop Physical Address ALPA for HSG80 controllers in the RAID system using the following commands HSG80 gt set this_controller port_1_topology offline HSG80 gt set other_controller port_1_topology offline HSG80 gt set this_controller port_1_al_pa n 7 HSG80 gt set other_controller port_1_al_pa n 7 Secure Path Version 3 2 for Windows Installation and Reference Guide 2 3 Hardware Setup Where n 1 is an available ALPA address selected from the table in Appendix C HSG80 gt set this_controller port_1_topology loop_hard HSG80 gt set other_coniroller port_1_topology loop_hard HSG80 gt set this_controller port_2_topology offline HSG80 gt set other_controller port_2_topology offline HSG80 gt set this_controller port_2_al_pa n HSG80 gt set other_controller port_2_al_pa n Where n is an available ALPA address selected from the table in Appendix C HSG80 gt
11. set this_controller port_2_topology loop_hard HSG80 gt set other_controller port_2_topology loop_hard For FC Switched Fabric configurations enter the following commands HSG80 gt set this_controller port_1_topology fabric HSG80 gt set other_controller port_1_topology fabric HSG80 gt set this_controller port_2_topology fabric HSG80 gt set other_controller port_2_topology fabric 5 Configure the RAID system controllers for multiple bus failover mode by entering the following commands HSG80 gt set nofailover IMPORTANT The other controller will shutdown and must be manually restarted by momentarily depressing the reset button on the controller s front panel Wait for two minutes for the controller to boot before proceeding HSG80 gt set multibus copy this The controllers will restart in multiple bus mode 6 After the other controller has restarted verify that both controllers are configured for multiple bus mode by issuing the following command HSG80 gt show this 7 Verify that the data returned to this command includes the statement that the controller is in a multiple bus dual redundant configuration 2 4 Secure Path Version 3 2 for Windows Installation and Reference Guide
12. tors and prevents failover failback ping pong effects caused by marginal or intermittent conditions Provides a choice of user selectable load balancing algorithms which optimize system workload performance Detects failures reliably without inducing false or unnecessary failovers Implements failover failback actions transparently without disrupting applications Provides client server web based management capability and multiple storage system support 1 2 Secure Path Version 4 0 for Windows Installation Guide Secure Path Technology Software Components The Secure Path Software kit for Windows includes the following software components HszDisk sys is a Windows NT class driver that provides unique error handling features and performance enhancements unavailable in the native Windows NT disk class driver It works with StorageWorks RAID Array controllers to enhance on line storage availability and fault tolerance HszDisk works in single host and cluster environments to maintain optimum subsystem performance during controller and storageset recovery operations In Windows 2000 the features provided by HszDisk have been integrated in RaiDisk obviating the need for this driver RaiDisk sys is a Windows filter driver that provides the primary failover capability in the Secure Path product RaiDisk supports StorageWorks RAID array multiple bus mode multiple path access and provides all functions required for monitoring I
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