Dell PowerConnect W-Airwave 7.2 Sizing Guide
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1. amount of storage per managed device and consumes much less space than a traditional rational database AMP spends much more time writing to the disk subsystem than reading from it Here are some factors which influence storage requirements for your AWMS server How many devices will the server manage How much historical data will the server retain How many wireless clients will the server monitor Will this Server run VisualRF and RAPIDS RAID Configuration Information 200 Devices and Below AWMS 100 and 200 models perform well on a single fast spindle speed disk 500 1 000 Devices RAID configuration requires at least 4 SAS SCSI disk drives in a RAID 10 configuration supplied via a hardware controller with at least 256 MB of cache All disk drives must have 15K RPM spindle speeds Do not use software RAID systems or SATA disk drives 1 000 2 500 Devices RAID configuration requires at least 6 SAS SCSI disk drives in a RAID 10 configuration supplied via a hardware controller with at least 512 MB of cache All disk drives must have 15K RPM spindle speeds 2 500 5 000 Devices Non SSD Drives AWMS 2 500 5 000 device installations require at least 16 SAS SCSI disk drives in a RAID 10 configuration supplied via a hardware controller with at least 1 GB of cache All disk drives must have 15K RPM spindle speeds 2 500 5 000 Devices SSD Drives AWMS 2 500 5 000 device installations with SSDs require two distinct di2. Dell PowerConnect W AirWave 7 2 Sizing Guide Copyright 2011 Dell PowerConnect W Networks Inc Dell PowerConnect W Networks trademarks include lt I NIMWAVE Dell PowerConnect W Networks Dell PowerConnect W Wireless Networks the registered Dell PowerConnect W the Mobile Edge Company logo Dell PowerConnect W Mobility Management System Mobile Edge Architecture People Move Networks Must Follow RFProtect Green Island All rights reserved All other trademarks are the property of their respective owners Dell the Dell logo and PowerConnect are trademarks of Dell Inc Open Source Code Certain Dell PowerConnect W products include Open Source software code developed by third parties including software code subject to the GNU General Public License GPL GNU Lesser General Public License LGPL or other Open Source Licenses The Open Source code used can be found at this site www arubanetworks com open_source Legal Notice The use of Dell PowerConnect W Networks Inc switching platforms and software by all individuals or corporations to terminate other vendors VPN client devices constitutes complete acceptance of liability by that individual or corporation for this action and indemnifies in full Dell PowerConnect W Networks Inc from any and all legal actions that might be taken against it with respect to infringement of copyright on behalf of those vendors Dell PowerConnect W AirWave 7 2 Sizing G
3. S atom senesi TO CO E CE E I CONI CO I CONI CE I CONI ce CSS K NOTE Auditing more than once a day can have a tremendous impact on scalability Table 9 Wired Scalability Test Values Category Value Rearend I EECH EECH Table 10 VisualRF Scalability Test Values Category Value Average floor plan size feet 62 500 Number of access points per floor plan CO I CI ome i 12 Virtualization and Scalability Dell PowerConnect W AirWave 7 2 Sizing Guide Table 10 Visua RF Scalability Test Values Continued Category VELE Rogue location timer minutes Location calculation timer min max number of samples 90 360 3 Dell PowerConnect W AirWave 7 2 Sizing Guide Virtualization and Scalability 13 14 Virtualization and Scalability Dell PowerConnect W AirWave 7 2 Sizing Guide Appendix A Miscellaneous Sizing Information AMD Hardware Table 11 AMD Hardware Matrix Managed Clock Speed Total AWMS RAPIDS VisualRF Devices CED Glass GH2 CPU Cores Memory Memory Memory 4 NOTE Dell does not actively conduct scalability testing for the AMD processor product line These numbers are based on published performance data Dell PowerConnect W AirWave 7 2 Sizing Guide Miscellaneous Sizing Information 15 16 Miscellaneous Sizing Information Dell PowerConnect W AirWave 7 2 Sizing Guide
4. W AirWave 7 2 Sizing Guide Chapter 3 Virtualization and Scalability This chapter includes the following topics Virtualization on page 11 Scalability Assumptions on page 12 Virtualization AWMS can run in a VMWare and Xen virtualized environment To ensure scalability you need to dedicate the processing and memory as described in the table below You must also ensure that the disk subsystem can maintain the IOPS throughput as detailed below Most virtualized environments use a shard disk subsystem assuming that each application will have bursts of I O without a sustained high I O throughput AWMS requires a continuous sustained high data I O rate Table 7 Virtualized Processing and Disk IOPS Matrix Managed Clock Speed Total Max Sustained Devices PED Class GH2 CPUs Cores Memory IOPS 2 500 Hex Core Intel Xeon X5680 48 GB 3 000 NOTE There are always spikes that go beyond the Sustained IOPS numbers stated above A 20 increase buffer is recommended for virtualized environments Ensure you allocate enough extra disk space for the OS and swap when partitioning the virtual disk Dell PowerConnect W AirWave 7 2 Sizing Guide Virtualization and Scalability 11 Scalability Assumptions Scalability is continuously tested based on the following assumptions Deviations from these assumptions can impact overall scalability of your AWMS server Table 8 Wireless Scalability Test Values Category Value CO
5. act Main Website dell com Support Website support dell com Documentation Website support dell com manuals 4 About this Guide Dell PowerConnect W AirWave 7 2 Sizing Guide Chapter 1 Sizing Overview This overview chapter includes the following topics CPU and Memory Matrix on page 5 Storage Matrix on page 6 Your hardware should incorporate margin for WLAN expansion as well as future AWMS features and modules These specifications are formulated to keep AWMS running on the same hardware platform for up to two years Factors which influence the processing requirements for your AWMS server How many devices will the server manage How often will AMP communicate these devices How many wireless clients will the server monitor Will this server run the RAPIDS IDS and WIPS modules Will this server run VisualRF and provide location services CPU and Memory Matrix Table 3 CPU and Memory Managed Clock Speed Total AWMS RAPIDS VisualRF Devices CPU Class GHz ae Cores Memory Memory Memory Pilot 1 25 APs Quad Core Intel 2 4 3 GB 5 GB 5 GB Xeon X3430 Quad Core Intel 2 53 4GB 1 GB 1 GB Xeon X3440 200 Quad Core Intel 2 8 4GB 2 GB 2GB Xeon X3460 Quad Core Intel 2 53 4GB 2 GB 2GB Xeon X5540 Quad Core Intel 2 8 6 GB 3 GB 3 GB Xeon X5560 2 500 Quad Core Intel 2 8 2 16 GB 4 GB 4GB Xeon X5560 2 500 Hex Core Intel 3 33 2 12 24 GB 6 GB 6 GB Xeon X5680 Del
6. de Interleaving Ensure Memory Node Interleaving is enabled on 32 bit operating systems By default most vendors disable this setting in their BIOS 64 bit ensure NUMA is enabled Some vendors BIOS have NUMA Enabled or NUMA Aware OS options Ensure that Power Management is configured for Maximum Performance By default most vendors configure BIOS to an eco friendly setting Ensure that Memory Operating Mode is configured to Optimizer Mode if available AMD Information Scalability numbers are based on published performance data versus the Intel product line See Appendix A Miscellaneous Sizing Information on page 15 for details in the AMD Scalability Matrix Operating System To ensure hardware capability purchase server hardware that is certified by Red Hat Enterprise Linux AWMS includes the CentOS operating system based on Red Hat Enterprise Linux and 1s installed by default You may choose to use Red Hat Enterprise Linux AWMS supports both 32 bit and 64 bit hardware platforms An AWMS server servicing more than 2 500 devices requires 64 bit OS installation coupled with AWMS 7 1 or higher AWMS 7 1 installs 64 bit CentOS by default Dell PowerConnect W AirWave 7 2 Sizing Guide CPU BIOS Operating Systems and Storage 7 Storage AWMS stores most statistical data in special statistical flat files This is a speed improvement over writing to a relational database Additionally it provides for a known fixed
7. ide About this Guide This preface provides an overview of this guide and contact information for Dell and includes the following sections Document Organization on page 3 Note Caution and Warning Icons on page 3 Contacting Support on page 4 Document Organization This document provides guidelines for purchasing new hardware which hosts the Dell PowerConnect W AirWave Wireless Management System AWMS Table 1 Chapter Organization and Purposes Chapter Description Chapter 1 Sizing Overview on Provides an overview of the sizing information page 5 Chapter 2 CPU BIOS Operating Details information about the CPU BIOS Operating systems and storage systems of Systems and Storage on page 7 AWMS Chapter 3 Virtualization and Discusses virtual machines and scaling of AWMS Scalability on page 11 Appendix A Miscellaneous Sizing Includes specifications on AMD Hardware Information on page 15 Note Caution and Warning Icons This document uses the following icons to emphasize advisories for certain actions configurations or concepts K NOTE Indicates helpful suggestions pertinent information and important things to remember CAUTION Indicates a risk of damage to your hardware or loss of data bg WARNING Indicates a risk of personal injury or death Dell PowerConnect W AirWave 7 2 Sizing Guide About this Guide 3 Contacting Support Table 2 Website cont
8. l PowerConnect W AirWave 7 2 VisualRF User Guide Sizing Overview 5 Storage Matrix Table 4 Storage Number of Min AWMS Max AWMS IOPS Devices Storage Storage 2 x random writes to reads 75 GB 75 GB 000 1 Drive 15K RPM Storage System ES emm mn mm Je mn Iepmmgne mm me ae Seene mm es Is mn Ice The 75 GB requirement on the smaller installation 100 500 accounts for the OS and swap overhead and it is very difficult to install a single disk with less than 75 GB capacity 4 NOTE Please ensure the disk subsystem can sustain these random write rates Sustained sequential write rates will not help because AWMS writes are primarily random 6 Sizing Overview Dell PowerConnect W AirWave 7 2 VisualRF User Guide Chapter 2 CPU BIOS Operating Systems and Storage This chapter explains sizing information for the following topics CPU and BIOS on page 7 Operating System on page 7 Storage on page H CPU and BIOS Intel Nehalem and Westmere Architecture Information With the advent of Nehalem Intel now supports NUMA Non Uniform Memory Access In NUMA memory on the same processor board as the CPU local memory is accessed faster than memory on other processor boards shared memory hence the non uniform nomenclature As a result NUMA architecture scales much better to higher numbers of CPUs cores than SMP 32 bit ensure NUMA is disabled Some vendors BIOS refer to non NUMA as Memory No
9. sk partitions The first partition will need 10 SSDs Solid State Disk drives in RAID 10 configuration supplied via a hardware controller with at least 1 GB of cache This partition is the high throughput data storage area var described in the partition table below The second partition will require at least two 2 SAS SCSI drives in a high availability configuration mirrored or RAID supplied via a hardware controller Both drives must have 15K RPM spindle speeds This partition will contain the boot and swap described in the partition tables below NOTE Please contact support dell com when purchasing or configuring any hardware platform servicing more than 2 500 devices K AWMS servers servicing more than 2 500 devices require 64 bit OS and AWMS 7 1 or higher Do not use software RAID systems or SATA disk drives 8 CPU BIOS Operating Systems and Storage Dell PowerConnect W AirWave 7 2 Sizing Guide Disk Partitioning AWMS automatically partitions the disk subsystem upon installation You can override these values Table 5 and Table 6 below list the default partitioning and provides guidance for more advanced scenarios Table 5 Default Partitions Default Partitions Size Table 6 Advanced Partitions Default Partitions Purpose Recommended Size AWMS 25 of total disk space 10 of total disk space 25 of total disk space 25 of total disk space 10 of total disk space NOTE Please ensure the disk subsystem can s
10. uide 0510830 01 April 2011 Contents About this ET TE 3 Mefe tlutc e EZ re nenon ea ENSA ina NENNE annia EESE EEN A ENET ENE SU NAERAA 3 Note Caution and Warning ICONS i 3 COn IV SOUL EE 4 Chapter 1 Sizing At 5 CPU and Memory Matrix E 5 Storage dE rt 6 Chapter 2 CPU BIOS Operating Systems and Storage rrrrrre eee 7 CPU Abi 7 Intel Nehalem and Westmere Architecture JIntformapnon 7 AMENO 7 Operating Sibari 7 SUC IRR CE RE RESTA 8 RAID Configuration Intormapon 8 200 Devices and BeloW cccssesesssscssesssscssssesessesessseecseseeseseesessesecsuseeseseesesaseesaesaesnseses 8 500 1 000 DEVICES 8 1 000 2 500 DEWC CS saiccscsaeveinvsincsvenciesecinseccsdendswatentsanivatdayeesiasinducdsudcvnainisedaediossdnleistenncndesids 8 2 500 5 000 Devices Non SSD DTrIVES 8 2 500 5 000 Devices SSD Dmves cece ceccecccecssecceesceeeceecceeeceeceeeecscesacesaeesaeesnessneesaeeaaes 8 LISCI aa 9 Storage SENTII 9 Chapter 3 Virtualization and SCAlabil sci 11 Virada e 11 Scalability ASSUMPTIONS cccccescscssssesssessesssesecscsessesesececseseesesecessusesaesesessusesacsusecatsesesausesansesasenes 12 Appendix A Miscellaneous Sizing Information ssessssssesessessesesesesseeeeesrsesseesarsesteeransesneeeanss 15 ACCC ne E O EAEE EEEE AAEE 15 Dell PowerConnect W AirWave 7 2 VisualRF User Guide 1 2 Dell PowerConnect W AirWave 7 2 VisualRF User Gu
11. ustain these random write rates Sustained sequential write rates will not help because AWMS writes are primarily random For platforms servicing more than 2 500 devices all var partitions should be located K on SSDs You may experience upgrade or installation issues when manually partitioning your disk subsystem Symbolic links are not recommended when configuring disk subsystem because of backup and restoration issues Storage System Tuning For RAID 10 Ensure that all disks are configured to One Virtual Disk If the RAID controller has battery backed cache ensure the Write Policy is configured to Write Back otherwise ensure it is configured to Write Through CentOS and RH Linux include four custom schedulers to handle I O CFO Completely Fair Queuing is the default algorithm Deadline elevator uses a deadline algorithm to minimize I O latency NOOP scheduler a simple FIFO Anticipatory elevator introduces a small delay before dispatching the I O Dell PowerConnect W AirWave 7 2 Sizing Guide CPU BIOS Operating Systems and Storage 9 While CFO works well in most installations Dell has found changing scheduler to NOOP and allowing the hardware RAID controller to handle I O queuing has produce significant I O improvements This is set via sys block lt device gt queue scheduler K NOTE Contact support dell com prior to changing this setting 10 CPU BIOS Operating Systems and Storage Dell PowerConnect
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