Dell PowerConnect W-Airwave 7.6 Sizing Guide

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Dell PowerConnect W-Airwave 7.6 Sizing Guide | Manualzz

Dell PowerConnect

W-AirWave 7.6

Server Sizing Guide

Copyright

© 2013 Aruba Networks, Inc. Aruba Networks trademarks include less Networks

®

, Aruba Networks

®

, Aruba Wire-

, 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 copyright on behalf of those vendors.

Feb 2013 | 0510830-06 Dell PowerConnect W-AirWave 7.6 | Server Sizing Guide

Selecting Your Hardware Components

CPU, Memory, and Storage Matrix

Choosing Your CPU

Choosing Your Memory

Choosing Your RAID Controller

RAID Configuration Information

200 Devices and Below

500 Devices

1,000 Devices

1,750 Devices

2,500 Devices

5,000 Devices - Non-SSD Drives

5,000 Devices - SSD Drives

Choosing Your Hard Drives

SSDs vs 15K SAS

Configuring Your Hardware

CPU Configuration

Disk Partitioning

File System Configuration

Virtualization and Scalability

Virtualization

Scalability Assumptions

Sizing a Master Console and Failover Server

Master Console

Failover Server

Contents

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4

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Dell PowerConnect W-AirWave 7.6 | Server Sizing Guide | iii

iv | Dell PowerConnect W-AirWave 7.6 | Server Sizing Guide

Chapter 1

Selecting Your Hardware Components

This document provides information for selecting hardware. Note that this document is current with supported information for Dell PowerConnect W-AirWave 7.6.

This section includes the following topics: l l l l l

"CPU, Memory, and Storage Matrix" on page 1

"Choosing Your CPU" on page 2

"Choosing Your Memory" on page 2

"Choosing Your RAID Controller" on page 3

"Choosing Your Hard Drives" on page 4

CPU, Memory, and Storage Matrix

The following table lists the recommended specifications for optimum AirWave server performance.

Table 1: Recommended CPU, Memory, and Storage

Devices CPU

RAM

(GB)

Disk Config

IOs Needed by AirWave Storage (GB)

Less than 500

500

1000

1500

4000

5000

5000 SSD

Any

Intel Core i3-2220 @

3.30GHz

Intel Core i5-3570 @

3.40GHz

8

16

32

Intel Xeon E5-2660 @

2.20GHz

48

Dual Intel Xeon E5-

2660 @ 2.20GHz

Dual Intel Xeon E5-

2690 @ 2.90GHz

Dual Intel Xeon E5-

2690 @ 2.90GHz

80

96

96

Any

6x 146GB 15k RAID

10

10x 146GB 15k

RAID 10

12x 146GB 15k

RAID 10

16x 146GB 15k RAID

10

50

300

600

900

2400

18x 146GB 15k RAID

10

3000

6x 500GB SSD RAID

10

3000

75

410

685

821

1095

1232

1397

NOTE: Ensure that the disk subsystem can sustain 4KB random write rates. Sustained sequential write rates will not help because

AirWave writes are primarily random.

Dell PowerConnect W-AirWave 7.6 | Server Sizing Guide Selecting Your Hardware Components | 1

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

Table 2: Minimum CPU, Memory, and Storage

Devices

Less than 500

500

1000

1500

4000

CPU RAM (GB)

Any

Intel Core i3 550 @

3.20GHz

Intel Xeon E5-1603 @ 2.8

GHz

Intel Xeon E5-2640 @

2.50GHz

Dual Intel Xeon E5-2640

@ 2.50GHz

4

8

16

32

64

Disk Config IOPs

Any

4x 146GB 15k RAID

10

6x 146GB 15k RAID

10

6x 146GB 15k RAID

10

8x 146GB 15k RAID

10

30

300

600

900

2400

Storage

(GB)

75

273

410

410

548

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 margins 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 that can influence the processing requirements for your AirWave server: l l

How many devices will the server manage?

How often will AirWave 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 AirWave installations, Dell recommends selecting high-performance Xeon E-series CPUs.

Dell performs scalability testing using Intel based hardware at this time. See

Table 1

in

"CPU, Memory, and Storage

Matrix" on page 1

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.

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.

2 | Selecting Your Hardware Components Dell PowerConnect W-AirWave 7.6 | Server Sizing Guide

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.

l l l l

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.

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+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.

5,000 Devices - SSD Drives

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

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.

Dell PowerConnect W-AirWave 7.6 | Server Sizing Guide Selecting Your Hardware Components | 3

A minimum of six (6) Enterprise SSDs in a RAID 1+0 configuration are required, (Refer to

"CPU, Memory, and

Storage Matrix" on page 1

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 dell.com/support.

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.

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 Dell support at dell.com/support.

4 | Selecting Your Hardware Components Dell PowerConnect W-AirWave 7.6 | Server Sizing Guide

Chapter 2

Configuring Your Hardware

This section explains sizing information for the following topics: l l l

"CPU Configuration " on page 5

"Disk Partitioning" on page 5

"File System Configuration" on page 5

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 3

below lists the default partitioning and provides guidance for more advanced scenarios.

Table 3: Default Partitions

Default Partitions Size boot 100 MB

/ swap 4 GB

Remainder of disk space

File System 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)

Dell PowerConnect W-AirWave 7.6 | Server Sizing Guide Configuring Your Hardware | 5

6 | Configuring Your Hardware Dell PowerConnect W-AirWave 7.6 | Server Sizing Guide

Chapter 3

Virtualization and Scalability

This section includes the following topics: l l

"Virtualization" on page 7

"Scalability Assumptions" on page 7

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 the

"CPU,

Memory, and Storage Matrix" on page 1

section, the hardware for virtualization should exceed these specifications by

20%.

NOTE: Dell 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 the

"CPU, Memory, and Storage Matrix" on page 1

section, Dell continually tests scalability based on the following assumptions. Deviations from these assumptions can impact overall scalability of your AirWave server.

Table 4: 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

10

5

30

25%

4

4

4

10

Dell PowerConnect W-AirWave 7.6 | Server Sizing Guide Virtualization and Scalability | 7

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

Table 5: 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)

8

8

8

20

25%

36

Table 6: 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

AirWave Synchronization timer (minutes)

Rogue location timer (minutes)

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

62,500

20

100

2,500

20

15

30

90/360/3

8 | Virtualization and Scalability Dell PowerConnect W-AirWave 7.6 | Server Sizing Guide

Appendix A

Sizing a Master Console and Failover

Server

Master Console

Table 7: Master Console Specifications

Environment

Size

CPU Class

Clock

Speed

(GHz)

Small (2-3 servers)

Intel Xeon

E5-2640

2.5

Large (>3 servers)

Dual Intel

Xeon E5-2640

2.5

CPUs

1

2

Total

Cores

Memory Disk Subsystem

6

12

32GB

64GB

6x 146GB 15k RAID 10 (410GB usable disk space)

8x 146GB 15k RAID 10 (548GB 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 7.6 | Server Sizing Guide Sizing a Master Console and Failover Server | 9

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