Aruba 7.5.x Getting Started

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Aruba 7.5.x Getting Started | Manualzz

AirWave 7.5

Copyright

© 2012 Aruba Networks, Inc. Aruba Networks trademarks include , Aruba Networks ® , Aruba Wireless Networks ® , the registered Aruba the Mobile Edge Company logo, Aruba 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.

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 copyright on behalf of those vendors.

Warranty

This hardware product is protected by the standard Aruba warranty of one year parts/labor. For more information, refer to the

ARUBACARE SERVICE AND SUPPORT TERMS AND CONDITIONS.

Altering this device (such as painting it) voids the warranty.

www.arubanetworks.com

1344 Crossman Avenue

Sunnyvale, California 94089

Phone: 408.227.4500

Fax 408.227.4550

AirWave 7.5

| Server Sizing Guide 0510816-06 | Oct 2012

Contents

Preface ................................................................................................................................... 1

Document Organization.........................................................................................1

Notice Icons...........................................................................................................1

Contacting Support ...............................................................................................2

Chapter 1 Selecting Your Hardware Components ................................................. 3

CPU, Memory, and Storage Matrix .......................................................................3

Choosing Your CPU ..............................................................................................4

Choosing Your Memory.........................................................................................5

Choosing Your RAID Controller.............................................................................5

RAID Configuration Information ......................................................................5

200 Devices and Below ............................................................................5

500 Devices ..............................................................................................5

1,000 Devices ...........................................................................................5

1,750 Devices ...........................................................................................5

2,500 Devices ...........................................................................................5

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

5,000 Devices - SSD Drives .....................................................................6

Choosing Your Hard Drives ...................................................................................6

SSDs vs 15K SAS ...........................................................................................6

Chapter 2 Configuring Your Hardware .................................................................... 7

CPU Configuration.................................................................................................7

Disk Partitioning.....................................................................................................7

Filesystem Configuration .......................................................................................7

Chapter 3

Appendix A

Virtualization and Scalability................................................................... 9

Virtualization ..........................................................................................................9

Scalability Assumptions ........................................................................................9

Sizing a Master Console and Failover Server ..................................... 11

Master Console ...................................................................................................11

Failover Server .....................................................................................................11

AirWave 7.5

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iv | AirWave 7.5

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Preface

WA

This preface provides an overview of this guide, and includes the following sections:

“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

Components” on page 3

Provides an overview of the sizing information.

Chapter 2, “Configuring Your Hardware” on page 7

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

Chapter 3, “Virtualization and Scalability” on page 9

Discusses virtual machines and scaling of AirWave.

Appendix A, “Sizing a Master Console and

Failover Server” on page 11

Includes specifications for Master Console and Failover.

Notice Icons

This document uses the following notice icons to emphasize advisories for certain actions, configurations, or concepts:

Indicates helpful suggestions, pertinent information, and important things to remember.

A

!

Caution:

Indicates a risk of damage to your hardware or loss of data.

Warning:

Indicates a risk of personal injury or death.

AirWave 7.5

| Server Sizing Guide Preface | 1

Contacting Support

Main Site

Support Site

Airheads Social Forums and

Knowledge Base

North American Telephone arubanetworks.com

support.arubanetworks.com

community.arubanetworks.com

International Telephones

Software Licensing Site

Wireless Security Incident

Response Team (WSIRT)

Support Email Addresses

Americas and APAC

EMEA

WSIRT Email

Please email details of any security problem found in an

Aruba product.

1-800-943-4526 (Toll Free)

1-408-754-1200 arubanetworks.com/support-services/aruba-support-program/contactsupport/ licensing.arubanetworks.com/login.php

arubanetworks.com/support/wsirt.php

[email protected]

[email protected]

[email protected]

2 | Preface AirWave 7.5

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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 5

“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

Managed

Devices

CPU Class

Min. Clock

Speed (GHz)

CPUs

AirWave

Memory

1 8 GB

AirWave

Storage

Sustained IOPs

Performance

4KB random write

Min. Disk

Configuration

75 GB 30 (1) 15K SAS Pilot 1-25

APs

Single Quad Core I3-

3240

3.4

100

200

Single Quad Core I5-

2500K

3.3

Single Quad Core

Intel® Xeon E5649

2.53

500

1,000

1,750

2,500

5,000

Single Quad Core I7-

2700K

3.5

Single Quad Core I7-

3770K

3.5

Single Quad Core

Intel® XeonE5-2640

2.5

Dual Quad Core

Intel® Xeon E5-2643

3.3

Dual Hex Core Intel®

XeonE5-2640

2.5

1

1

1

1

1

2

2

8 GB

12 GB

16 GB

24 GB

32 GB

48 GB

64 GB

75 GB

75 GB

75 GB

60

120

300

187 GB 600

275 GB 1,000

375 GB 1,500

600 GB 3,000

(1) 15K SAS

(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

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.

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| 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

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

Single Quad Core

Intel® Xeon I3-2100

3.1

100

200

Single Quad Core

Intel® Xeon E3-1220

3.1

Single Quad Core

Intel® Xeon E3-1240

3.3

500

1,000

Single Quad Core

Intel® Xeon W3670

3.2

Single Quad Core

Intel® Xeon X5687

3.6

1,750

2,500

5,000

Single Quad Core

Intel® Xeon X5687

Dual Quad Core

Intel® Xeon X5687

3.6

3.6

Dual Hex Core Intel®

Xeon X5690

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

AirWave includes the 64-bit CentOS operating system based on Red Hat Enterprise Linux (RHEL) and is installed by default.

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?

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 AirWave installations, Aruba recommends selecting high-performance Xeon X or W-series based CPUs.

Aruba 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.

4 | Selecting Your Hardware Components AirWave 7.5

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Choosing Your Memory

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.

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.

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+0configuration 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.

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.

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.

If you have any questions regarding hardware compatibility or selection, contact Aruba support.

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.

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 redundancy and performance. Any parity based RAID (5/6/etc) is not recommended.

For additional information, please contact Aruba support.

6 | Selecting Your Hardware Components AirWave 7.5

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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

/ boot swap

Size

100 MB

4 GB

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 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)

AirWave 7.5

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8 | Configuring Your Hardware 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%.

Aruba recommends a 20% 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 , Aruba 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

AP Interface polling period

Device-to-device link period

CDP neighbor data polling

Ratio of switches/routers to access points

Read ARP polling (hours)

Read CDP table for device discovery polling (hours)

Read bridge forwarding table polling (hours)

Interface Up/Down polling period

Value

4

4

4

10

10

5

30

25%

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

AirWave 7.5

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Table 6 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 7 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

8

25%

36

8

20

Value

62,500

20

100

2,500

20

15

30

90/360/3

10 | Virtualization and Scalability AirWave 7.5

| Server Sizing Guide

Appendix A

Sizing a Master Console and

Failover Server

Master Console

Table 8 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

CPUs

Total

Cores

Memory Disk Subsystem

1

2

4

8

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 monitors to ensure smooth operation in a failover situation.

AirWave 7.5

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12 | Sizing a Master Console and Failover Server AirWave 7.5

| Server Sizing Guide

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