Dell PowerConnect W-Airwave 7.4 Sizing Guide

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Dell PowerConnect W-Airwave 7.4 Sizing Guide | Manualzz

Dell PowerConnect W-

AirWave 7.4

Server Sizing Guide

Copyright

© 2011 Aruba Networks, Inc. Aruba Networks trademarks include registered Aruba the Mobile Edge Company logo, and Aruba Mobility Management System trademarks of Dell Inc.

, Aruba Networks

®

® , Aruba Wireless Networks ® , the

. Dell™, the DELL™ logo, and PowerConnect™ are

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. 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 copyright on behalf of those vendors.

Dell PowerConnect W-AirWave 7.4 | Server Sizing Guide 0510830-03 | December 2011

Contents

Preface....................................................................................................................................................................... 5

Document Organization ..................................................................................................................... 5

Note, Caution, and Warning Icons .................................................................................................. 5

Contacting Support ............................................................................................................................ 6

Chapter 1

Chapter 2

Selecting Your Hardware Components ........................................................................... 7

CPU, Memory, and Storage Matrix.................................................................................................. 7

Choosing Your CPU ............................................................................................................................ 8

Choosing Your Memory ..................................................................................................................... 9

Choosing Your RAID Controller ........................................................................................................ 9

RAID Configuration Information............................................................................................... 9

200 Devices and Below ..................................................................................................... 9

500 Devices ......................................................................................................................... 9

1,000 Devices ...................................................................................................................... 9

1,750 Devices ...................................................................................................................... 9

2,500 Devices ...................................................................................................................... 9

5,000 Devices - Non-SSD Drives...................................................................................... 9

5,000 Devices - SSD Drives............................................................................................. 10

Choosing Your Hard Drives ............................................................................................................. 10

SSDs vs 15K SAS ...................................................................................................................... 10

Configuring Your Hardware............................................................................................. 11

CPU Configuration ............................................................................................................................ 11

Disk Partitioning................................................................................................................................ 11

Filesystem Configuration ................................................................................................................. 11

Chapter 3

Appendix A

Virtualization and Scalability........................................................................................... 13

Virtualization...................................................................................................................................... 13

Scalability Assumptions .................................................................................................................. 13

Sizing a Master Console And Failover........................................................................... 15

Master Console................................................................................................................................. 15

Failover Server .................................................................................................................................. 15

Dell PowerConnect W-AirWave | Server Sizing Guide

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4 | Dell PowerConnect W-AirWave | Server Sizing Guide

Preface

This preface provides an overview of this guide, a list of all documentation available for AirWave 7.4, including contact information for Dell, and includes the following sections:

“Document Organization” on page 5

“Note, Caution, and Warning Icons” on page 5

“Contacting Support” on page 6

Document Organization

This document provides guidelines for purchasing new hardware which hosts AirWave.

NOTE: Dell PowerConnect W-Series AirWave Wireless Management Suite (AWMS), AirWave, and AirWave Management

Platform (AMP) refer to the same product set and are used interchangeably.

Table 1

Document Organization and Purposes

Chapter Description

Chapter 1, “Selecting Your Hardware

Components” on page 7

Chapter 2, “Configuring Your Hardware” on page 11

Chapter 3, “Virtualization and Scalability” on page 13

Appendix A, “Sizing a Master Console And

Failover” on page 15

Provides an overview of the sizing information.

Details information about the CPU, Disk, and file system configuration of

AirWave.

Discusses virtual machines and scaling of AirWave.

Includes specifications for Master Console and Failover.

Note, Caution, and Warning Icons

This document uses the following note, caution, and warning 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 7.4 | Server Sizing Guide

Preface |

5

Contacting Support

Table 2

Web Support

Web Support

Main Website

Support Website

Documentation Website dell.com

support.dell.com

support.dell.com/manuals

6 | Preface Dell PowerConnect W-AirWave 7.4 | Server Sizing Guide

Chapter 1

Selecting Your Hardware Components

This overview chapter includes the following topics:

“CPU, Memory, and Storage Matrix” on page 7

“Choosing Your CPU” on page 8

“Choosing Your Memory” on page 9

“Choosing Your RAID Controller” on page 9

“Choosing Your Hard Drives” on page 10

CPU, Memory, and Storage Matrix

The following table lists the recommended specifications for optimum Dell PowerConnect W-AirWave server performance.

Table 3

Recommended CPU, Memory, and Storage

Managed

Devices

CPU Class

Min. Clock

Speed

(GHz)

AirWave

Storage

Sustained

IOPs

Performance

4KB random write

Min. Disk

Configuration

Pilot 1-25

APs

100

1

1

8 GB

8 GB

75 GB

75 GB

30

60

(1) 15K SAS

(1) 15K SAS

200

500

1,000

1,750

2,500

5,000

Single Quad Core

Intel® Xeon I3-2100

Single Quad Core

Intel® Xeon E3-1220

Single Quad Core

Intel® Xeon E3-1240

3.1

3.1

3.3

3.2

Single Quad Core

Intel® Xeon W3670

Single Quad Core

Intel® Xeon X5687

Single Quad Core

Intel® Xeon X5687

3.6

3.6

Dual Quad Core

Intel® Xeon X5687

3.6

Dual Hex Core Intel®

Xeon X5690

3.46

1

1

1

1

2

2

8 GB

12 GB

16 GB

24 GB

32 GB (36 GB optimized**)

64 GB (72 GB optimized**)

75 GB

75 GB

187 GB

275 GB

375 GB

600 GB

120

300

600

1,000

1,500

3,000

(1) 15K SAS

(4) 15K SAS in

RAID 1+0

(6) 15K SAS in

RAID 1+0

(8) 15K SAS in

RAID 1+0

(8) 15K SAS in

RAID 1+0

(16) 15K SAS in RAID 1+0

** Optimized memory can vary depending on the vendor configuration. For more information, contact Dell support at support.dell.com

.

NOTE: Ensure that the disk subsystem can sustain these 4KB random write rates. Sustained sequential write rates will not help because Dell PowerConnect W-AirWave writes are primarily random.

Dell PowerConnect W-AirWave 7.4 | Server Sizing Guide

Selecting Your Hardware Components |

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The following table lists the minimum specifications required to run AirWave.

Table 4

Minimum CPU, Memory, and Storage

Managed

Devices

CPU Class

Min. Clock

Speed (GHz) CPUs

AirWave

Memory

AirWave

Storage

Sustained

IOPs

Performance

4KB random write

Min. Disk

Configuration

Pilot 1-25

APs

100

200

500

1,000

1,750

2,500

5,000

Single Quad Core

Intel® Xeon I3-2100

3.1

Single Quad Core

Intel® Xeon E3-1220

3.1

Single Quad Core

Intel® Xeon E3-1240

3.3

3.2

Single Quad Core

Intel® Xeon W3670

Single Quad Core

Intel® Xeon X5687

Single Quad Core

Intel® Xeon X5687

Dual Quad Core

Intel® Xeon X5687

Dual Hex Core

Intel® Xeon X5690

3.6

3.6

3.6

3.46

1

1

1

1

1

1

2

2

4 GB

6 GB

6 GB

8 GB

12 GB

18 GB

24 GB

48 GB

75 GB

75 GB

75 GB

75 GB

150 GB

225 GB

300 GB

450 GB

30

60

120

300

600

1,000

1,500

3,000

(1) 15K SAS

(1) 15K SAS

(1) 15K SAS

(4) 15K SAS in

RAID 1+0

(4) 15K SAS in

RAID 1+0

(6) 15K SAS in

RAID 1+0

(6) 15K SAS in

RAID 1+0

(16) 15K SAS in

RAID 1+0

Dell PowerConnect W-AirWave includes the 64-bit CentOS operating system based on Red Hat Enterprise

Linux (RHEL) and is installed by default.

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 AMP communicate with these devices?

NOTE: To ensure hardware capability, purchase server hardware that is certified to be compatible with Red Hat Enterprise Linux 5

(RHEL5).

Choosing Your CPU

For most Dell PowerConnect W-AirWave installations, select high-performance Xeon X or W-series based

CPUs.

Scalability testing uses Intel based hardware at this time. See

Table 3

for recommendations on CPU selection based on clock speed and core type.

8 | Selecting Your Hardware Components Dell PowerConnect W-AirWave 7.4 | Server Sizing Guide

Choosing Your Memory

Dell PowerConnect W-AirWave's memory recommendations scale linearly with the managed device count.

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 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.

CAUTION: 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 six 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 7.4 | Server Sizing Guide

Selecting Your Hardware Components |

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5,000 Devices - SSD Drives

AWMS 2,500 - 5,000 device installations with SSDs require Single Level Cell (SLC) Enterprise class SSD drives.

CAUTION: 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 7 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.

NOTE: If you have any questions regarding hardware compatibility or selection, contact Dell support at support.dell.com

.

NOTE: AirWave servers servicing more than 2,500 devices require 64-bit OS and AirWave 7.1 or higher. 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 ½ 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.

Dell PowerConnect W-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 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 redudancy and performance. Any parity based RAID (5/6/etc) is not recommended.

For additional information, please contact Dell support at support.dell.com

.

10 | Selecting Your Hardware Components Dell PowerConnect W-AirWave 7.4 | Server Sizing Guide

Chapter 2

Configuring Your Hardware

This chapter explains sizing information for the following topics:

“CPU Configuration” on page 11

“Disk Partitioning” on page 11

“Filesystem Configuration” on page 11

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

Dell PowerConnect W-AirWave 7.4 automatically partitions the disk subsystem upon installation. You can override these values.

Table 5 below lists the default partitioning and provides guidance for more advanced

scenarios.

Table 5

Default Partitions

Default Partitions Size

boot

/ swap

100 MB

4 GB

Remainder of disk space

Filesystem Configuration

For Dell PowerConnect W-AirWave 7.4, the NOOP File I/O scheduler provides the best random write performance. If you are running Airwave 7.2 or newer, Airwave should automatically manage this 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 > /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 7.4 | Server Sizing Guide

Configuring Your Hardware |

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12 | Configuring Your Hardware Dell PowerConnect W-AirWave 7.4 | Server Sizing Guide

Chapter 3

Virtualization and Scalability

This chapter includes the following topics:

“Virtualization” on page 13

“Scalability Assumptions” on page 13

Virtualization

Dell PowerConnect W-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 3 , the

hardware for virtualization should exceed these specifications by 20%.

NOTE: 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.

Scalability Assumptions

Using the specs outlined in

Table 3 , scalability tests are based on the following assumptions. Deviations from

these assumptions can impact overall scalability of your AirWave server.

Table 6

Wireless Scalability Test Values

Category Value

Average density of client devices per access point

Device configuration auditing interval

Up/Down status polling period (minutes)

User data polling period (minutes)

Thin AP discovery period (minutes)

Device-to-device link polling period (minutes)

Device bandwidth polling period (minutes)

802.11 counters polling period (minutes)

Rogue AP and device location data polling period (minutes)

CDP neighbor data polling period (minutes)

10

15

15

20

30

60

5

10

5

Daily

NOTE: Auditing more than once a day can have a tremendous impact on scalability.

Dell PowerConnect W-AirWave 7.4 | Server Sizing Guide

Virtualization and Scalability |

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Table 7

Wired Scalability Test Values

Category

Ratio of switches/routers to access points

Average port density of switches/routers

Read ARP polling period (hours)

Read CDP table for device discovery polling period (hours)

Read bridge forwarding table polling period (hours)

Interface polling period (minutes)

Table 8

VisualRF Scalability Test Values

Category

Average floor plan size (feet)

Number of access points per floor plan

Number of clients per floor plan

Number of attenuation grid cells per floor plan

Number Rogue devices per floor plan

AMP Synchronization timer (minutes)

Rogue location timer (minutes)

Location calculation timer (min/max/number of samples)

Value

8

20

8

8

20%

36

Value

62,500

20

100

15

30

2,500

20

90/360/3

14 | Virtualization and Scalability Dell PowerConnect W-AirWave 7.4 | Server Sizing Guide

Appendix A

Sizing a Master Console and Failover

Master Console

Table 9

Master Console Specifications

Environment

Size

CPU Class

Clock

Speed

(GHz)

Small (2-3 servers)

Large (>3 servers)

Quad Core Intel®

Xeon® X5687

Quad Core Intel®

Xeon® X5687

3.6

3.6

1

2

4

8

Memory Disk Subsystem

12 GB

24 GB

(4) 73GB, 15K RPM - RAID 1+0, 146

GB of usable disk space

(6) 146GB, 15K RPM - RAID 1+0, 438

GB of usable disk space

Failover Server

The Failover server should be as powerful as the most powerful AMP server that it is monitoring to ensure smooth operation in a failover situation.

Dell PowerConnect W-AirWave 7.4 | Server Sizing Guide

Sizing a Master Console and Failover |

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16 | Sizing a Master Console and Failover Dell PowerConnect W-AirWave 7.4 | Server Sizing Guide

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Frequently Answers and Questions

What is the minimum number of cores needed on the CPU for AirWave?
1 or single
What is the minimum memory requirement for AirWave?
4 GB
What is the minimum disk space requirement for AirWave?
75 GB
What is the recommended minimum sustained 4KB random write rate for the storage?
30 IOPS
What RAID configuration is recommended for a system with 1,000 managed devices?
4 x 15K SAS in RAID 1+0
What is the optimal memory configuration for an AirWave system with 5,000 managed devices?
64 GB to 72 GB
Which Xeon processor has a base clock speed of 3.6 GHz and can support up to 24 cores?
Intel Xeon X5687