Dell PowerConnect W-Airwave 7.5 Sizing Guide
Contents
1. Table 7 VisualRF Scalability Test Values Average floor plan size feet 62 500 Number of access points per floor plan 20 Number of clients per floor plan 100 Number of attenuation grid cells per floor plan 2 500 Number Rogue devices per floor plan 20 AirWave Synchronization timer minutes 15 Rogue location timer minutes 30 Location calculation timer min max number of samples 90 360 3 10 Virtualization and Scalability Dell PowerConnect W AirWave 7 5 Server Sizing Guide Appendix A Sizing a Master Console and Failover Server Master Console Table 8 Master Console Specifications Environment Clock Total CPU Class Speed CPUs Memory Disk Subsystem Size Cores GHz Small 2 3 Quad Core Intel 3 6 1 4 12 GB 4 73GB 15K RPM RAID 1 0 146 servers Xeon X5687 GB of usable disk space Large gt 3 Quad Core Intel 3 6 2 8 24 GB 6 146GB 15K RPM RAID 1 0 438 servers Xeon X5687 GB of usable disk space Failover Server The Failover server should be as powerful as the most powerful AirWave server that it monitors to ensure smooth operation in a failover situation Dell PowerConnect W AirWave 7 5 Server Sizing Guide Sizing a Master Console and Failover Server 11 12 Sizing a Master Console and Failover Server Dell PowerConnect W AirWave 7 5 Server Sizing Guide2. Document Organization on page 1 Notice Icons on page 1 Contacting Support on page 2 Document Organization This document provides guidelines for purchasing new hardware that hosts AirWave Table 1 Document Organization and Purposes Chapter Description Chapter 1 Selecting Your Hardware Provides an overview of the sizing information Components on page 3 Chapter 2 Configuring Your Hardware on Details information about the CPU Disk and file system configuration of page7 AirWave Chapter 3 Virtualization and Scalability on Discusses virtual machines and scaling of AirWave page 9 Appendix A Sizing a Master Console and Includes specifications for Master Console and Failover Failover Server on page 11 Notice Icons This document uses the following notice icons to emphasize advisories for certain actions configurations or concepts NOTE Indicates helpful suggestions pertinent information and important things to remember CAUTION Indicates a risk of damage to your hardware or loss of data WARNING Indicates a risk of personal injury or death Dell PowerConnect W AirWave Server Sizing Guide Preface 1 Contacting Support Web Site Support Main Website dell com Support Website support dell com Documentation Website support dell com manuals 2 Preface Dell PowerConnect W AirWave Server Sizing Guide
3. E NOTE If you choose to install RHEL instead of the supplied CentOS you will need to purchase your own RHEL license and support separately Your hardware should incorporate margin for WLAN expansion as well as future AirWave features and modules These recommended specifications are formulated to keep AirWave running on the same hardware platform for up to three years Factors which influence the processing requirements for your AirWave server How many devices will the server manage How often will AirWave communicate with these devices E NOTE To ensure hardware capability purchase server hardware that is certified to be compatible with Red Hat Enterprise Linux 5 RHELS5 Choosing Your CPU For most AirWave installations Dell recommends selecting high performance Xeon X or W series based CPUs Dell performs scalability testing using Intel based hardware at this time See Table 2 for recommendations on CPU selection based on clock speed and core type Choosing Your Memory AirWave s memory recommendations scale linearly with the managed device count 4 Selecting Your Hardware Components Dell PowerConnect W AirWave 7 5 Server Sizing Guide With AirWave servers running at full load for those device counts with a large number of floorplans the recommended memory usually results in best overall performance Best performance is defined by minimal disk reads due to sufficient caching thus allowing for maximum disk
4. Chapter 1 Selecting Your Hardware Components This overview chapter includes the following topics CPU Memory and Storage Matrix on page 3 Choosing Your CPU on page 4 Choosing Your Memory on page 4 Choosing Your RAID Controller on page 5 Choosing Your Hard Drives on page 6 CPU Memory and Storage Matrix The following table lists the recommended specifications for optimum AirWave server performance Table 2 Recommended CPU Memory and Storage Sustained IOPs Min Disk nae CPU Class See CPUs dici poi Performance Configura P ry g 4KB random write tion Pilot 1 25 Single Quad Core 3 1 1 8 GB 75 GB 30 1 15K SAS APs Intel Xeon 13 2100 100 Single Quad Core 3 1 1 8GB 75 GB 60 1 15K SAS Intel Xeon E3 1220 200 Single Quad Core 3 3 1 8 GB 75 GB 120 1 15K SAS Intel Xeon E3 1240 500 Single Quad Core 3 2 1 12 GB 75 GB 300 4 15K SAS in Intel Xeon W3670 RAID 1 0 1 000 Single Quad Core 3 6 1 16 GB 187 GB 600 6 15K SAS in Intel Xeon X5687 RAID 1 0 1 750 Single Quad Core 3 6 1 24 GB 275 GB 1 000 8 15K SAS in Intel Xeon X5687 RAID 1 0 2 500 Dual Quad Core Intel 3 6 2 32 GB 36 GB 375 GB 1 500 8 15K SAS in Xeon X5687 optimized RAID 1 0 5 000 Dual Hex Core Intel 3 46 2 64 GB 72 GB 600 GB 3 000 16 15K SAS Xeon X5690 optimized in RAID 1 0 Optimized memory can vary depending on the vendor configuration Contact Dell support at
5. support dell com for more information E NOTE Ensure that the disk subsystem can sustain these 4KB random write rates Sustained sequential write rates will not help because AirWave writes are primarily random Dell PowerConnect W AirWave 7 5 Server Sizing Guide Selecting Your Hardware Components 3 The following table lists the minimum specifications required to run AirWave Table 3 Minimum CPU Memory and Storage i Min Disk Managed Min Clock AirWave AirWave SUStained I0Ps 3 Devi CPU Class Speed GHz Memor storage Performance Configura vices pee Z Y g 4KB random write tion Pilot 1 25 Single Quad Core 3 1 1 4GB 75 GB 30 1 15K SAS APs Intel Xeon 13 2100 100 Single Quad Core 3 1 1 6 GB 75 GB 60 1 15K SAS Intel Xeon E3 1220 200 Single Quad Core 3 3 1 6 GB 75 GB 120 1 15K SAS Intel Xeon E3 1240 500 Single Quad Core 3 2 1 8 GB 75 GB 300 4 15K SAS in Intel Xeon W3670 RAID 1 0 1 000 Single Quad Core 3 6 1 12 GB 150 GB 600 4 15K SAS in Intel Xeon X5687 RAID 1 0 1 750 Single Quad Core 3 6 1 18 GB 225 GB 1 000 6 15K SAS in Intel Xeon X5687 RAID 1 0 2 500 Dual Quad Core Intel 3 6 2 24GB 300 GB 1 500 6 15K SAS in Xeon X5687 RAID 1 0 5 000 Dual Hex Core Intel 3 46 2 48 GB 450 GB 3 000 16 15K SAS in Xeon X5690 RAID 1 0 AirWave includes the 64 bit CentOS operating system based on Red Hat Enterprise Linux RHEL and is installed by default
6. write performance and minimal CPU I O wait time Choosing Your RAID Controller RAID 1 0 is the ONLY supported RAID configuration for AirWave NOTE Software RAID and SATA drives are NOT SUPPORTED for any configuration of AirWave RAID Configuration Information For RAID 1 0 Dedicated Hardware RAID controller with caching and battery backup or non volatile NV cache RAID controller should be configured for Write Back caching with battery backup unless NVcache is selected then Force Write Back without Battery backup is recommended Individual Drive Caching should be enabled Ensure that all disks are assigned and configured to a single volume K NOTE Improper RAID configuration can result in drastically reduced server performance 200 Devices and Below AirWave 100 and 200 models perform well on a single fast spindle speed disk 500 Devices RAID 1 0 configuration of four 4 or more 15K SAS drives in a single volume with dedicated Hardware RAID controller with minimum 256MB of cache and battery backup 1 000 Devices RAID 1 0 configuration of four 4 or more 15K SAS drives in a single volume with dedicated Hardware RAID controller with minimum 256MB of cache and battery backup 1 750 Devices RAID 1 0 configuration of six to eight 6 8 or more 15K SAS drives in a single volume with dedicated Hardware RAID controller with minimum 512MB of cache and battery backup 2 500 Devices RAID 1 0 configuration of s
7. 0 increase buffer for virtualized environments Ensure you allocate enough extra disk space for the OS and swap when partitioning the virtual disk Scalability Assumptions Using the specifications outlined in Table 2 Dell continually tests scalability based on the following assumptions Deviations from these assumptions can impact overall scalability of your AirWave server Table 5 Wireless Scalability Test Values Category Value Average density of client devices per access point 5 Device configuration auditing interval Daily Up Down status polling period minutes 5 User data polling period minutes 10 Thin AP discovery period minutes 15 Device to device link polling period minutes 20 Device bandwidth polling period minutes 10 802 11 counters polling period minutes 15 Rogue AP and device location data polling period minutes 30 CDP neighbor data polling period minutes 60 NOTE Auditing more than once a day can have a tremendous impact on scalability Dell PowerConnect W AirWave 7 5 Server Sizing Guide Virtualization and Scalability 9 Table 6 Wired Scalability Test Values Category Value Ratio of switches routers to access points 20 Average port density of switches routers 36 Read ARP polling period hours 8 Read CDP table for device discovery polling period hours 8 Read bridge forwarding table polling period hours 8 Interface polling period minutes 20
8. Dell PowerConnect W AirWave 7 5 Server Sizing Guide Copyright 2012 Aruba Networks Inc Aruba Networks trademarks include CP Air WaVE Aruba Networks Aruba Wireless Networks the registered Aruba the Mobile Edge Company logo and Aruba Mobility Management System Dell the DELL logo and PowerConnect are trademarks of Dell Inc All rights reserved Specifications in this manual are subject to change without notice Originated in the USA All other trademarks are the property of their respective owners Open Source Code Certain Aruba 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 Includes software from Litech Systems Design The IF MAP client library copyright 2011 Infoblox Inc All rights reserved This product includes software developed by Lars Fenneberg et al The Open Source code used can be found at this site http www arubanetworks com open_source Legal Notice The use of Aruba 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 Aruba Networks Inc from any and all legal actions that might be taken against it with respect to infringement of copyri
9. SSDs that their offerings are appropriate for a 24 7 sustained high random write database server and are not a consumer grade SSD In general RAID 1 0 is still recommended for SSD deployments to allow for the best overall redundancy and performance Any parity based RAID 5 6 etc is not recommended For additional information please contact Dell support at support dell com 6 Selecting Your Hardware Components Dell PowerConnect W AirWave 7 5 Server Sizing Guide Chapter 2 Configuring Your Hardware This chapter explains sizing information for the following topics CPU Configuration on page 7 Disk Partitioning on page 7 Filesystem Configuration on page 7 CPU Configuration 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 Disk Partitioning AirWave automatically partitions the disk subsystem upon installation You can override these values Table 4 below lists the default partitioning and provides guidance for more advanced scenarios Table 4 Default Partitions Default Partitions Size boot 100 MB swap 4GB Remainder of disk space Filesystem Configuration For AirWave the NOOP File I O scheduler provides the best random write performance If you are running AirWave 7 2 or later AirWave should automatically manage th
10. ght on behalf of those vendors Dell PowerConnect W AirWave 7 5 Server Sizing Guide 0510830 04 Aug 2012 Contents POR Eeer 1 Document Organization 1 Notice ICONS eeneg Eege aan alla ae 1 Contacting SUPporti ancient 2 Chapter 1 Selecting Your Hardware Components iii 3 CPU Memory and Storage MatriX e 3 Nudelen EE 4 Choosing Your Memory ENEE 4 Choosing Your RAID Controller ENEE 5 RAID Configuration Intormaton EE 5 200 Devices and Below ecccsesessssssssssssescsesesscsescssesessssesseseseessseeseasseeasseecessseessseesesanes 5 BOO DEVICES E 5 WOOO DOVIC TEE 5 UC ANNETTE 5 2500 DEVICES 5 5 000 Devices NOn SSD Drves ENEE 5 5 000 Devices SSD Drive 6 Choosing Your Hard Drives ENEE 6 NET 6 Chapter 2 Configuring Your Hardware egene enee 7 CPU COMPiQuratio ns cceisssiccasceisvazedaracedscatice erdisiscacceerassdarcceusen cde chassdecanceWersdelavascdseaterdavissitesscdseaterterusn 7 Disk Partita rath Gh BEE 7 Filesystem Configuration ENEE 7 Chapter 3 Virtualization and SERlRIlI snc 9 Virtualization ela 9 Scalability ASSUMPTIONS ENEE 9 Appendix A Sizing a Master Console and Failover Server iii 11 Master Console 11 Failover TE 11 Dell PowerConnect W AirWave 7 5 Server Sizing Guide Contents iii iv Contents Dell PowerConnect W AirWave 7 5 Server Sizing Guide Preface This preface provides an overview of this guide and includes the following sections
11. is setting for you To check the currently assigned scheduler if sda is not your device name please replace with the correct device name cat sys block sda queue scheduler noop anticipatory deadline cfq Sample Output To configure noop as your preferred scheduler echo noop gt sys block sda queue scheduler And confirm that your change has been applied cat sys block sda queue scheduler noop anticipatory deadline cfq Expected Output Dell PowerConnect W AirWave 7 5 Server Sizing Guide Configuring Your Hardware 7 8 Configuring Your Hardware Dell PowerConnect W AirWave 7 5 Server Sizing Guide Chapter 3 Virtualization and Scalability This chapter includes the following topics Virtualization on page 9 Scalability Assumptions on page 9 Virtualization AirWave can run in a VMware and Xen virtualized environment To ensure scalability dedicate the processing and memory You must also ensure that the disk subsystem can maintain the IOPS throughput as detailed below Most virtualized environments use a shared disk subsystem assuming that each application will have bursts of I O without a sustained high I O throughput AirWave requires a continuous sustained high data I O rate For virtualized environment use dedicated hardware If you are using the specifications outlined in Table 2 the hardware for virtualization should exceed these specifications by 20 E NOTE Dell recommends a 2
12. ix to eight 6 8 or more 15K SAS drives in a single volume with dedicated Hardware RAID controller with minimum 1GB of cache and battery backup 5 000 Devices Non SSD Drives RAID 1 0 configuration of sixteen 16 or more 15K SAS drives in a single volume with dedicated Hardware RAID controller with minimum 1GB of cache and battery backup Dell PowerConnect W AirWave 7 5 Server Sizing Guide Selecting Your Hardware Components 5 5 000 Devices SSD Drives AWMS 2 500 5 000 device installations with SSDs require Single Level Cell SLC Enterprise class SSD drives E NOTE Do not use Multi Level Cell MLC Consumer class drives Use of MLC drives can result in drastically reduced SSD drive lifespan and data loss volume failure due to write exhaustion A minimum of six 6 Enterprise SSDs in a RAID 1 0 configuration are required Please see CPU Memory and Storage Matrix on page 3 for minimum needed storage capacity information Eight 8 or more SSDs in a RAID 1 0 configuration are recommended The target random write 4KB IOP Performance is at minimum 3 000 sustained IOPS for 5 000 device monitoring The actual disk IOP requirement can vary depending on the configuration of the AirWave server K NOTE If you have any questions regarding hardware compatibility or selection contact Dell support at support dell com E NOTE AirWave servers servicing more than 2 500 devices require 64 bit OS and AirWave 7 1 or highe
13. r Do not use software RAID systems or SATA disk drives Choosing Your Hard Drives 15K SAS drives are the highest performance spinning platter drives available today Serial ATA and 10K SAS are vastly outperformed by 15K SAS and should not be used in an AirWave server You will need to select the appropriately sized hard drive to meet your desired storage volume after taking into account RAID 1 0 reduction on overall storage capacity RAID 1 0 reduces your single volume available drive space by 1 2 because of the redundancy introduced An example would be 16x 146GB 15K SAS hard drives in a RAID 1 0 volume will result in approximately 1 1 TB of storage space 16 146GB 2 SSDs vs 15K SAS Solid State Drives are becoming more affordable and are being offered as a high performance drive option by many vendors SSDs offer performance that far outstrips 15K SAS but at a significant cost premium AirWave supports deployment on SSD based storage arrays and can take advantage of the high speed disk access and stellar random write performance To select an appropriate SSD you ll want to ensure that the SSD is classified as Enterprise class This generally indicates a drive that uses Single Level Cell SLC technology versus Multi Level Cell MLC technology SLC technology is required for an AirWave server to avoid unexpected write exhaustion and or poor performance due to write amplification Confirm with your vendor prior to purchasing
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