Dell PowerConnect W-Airwave 7.2 Sizing Guide

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Dell PowerConnect W-Airwave 7.2 Sizing Guide | Manualzz

Dell PowerConnect W

AirWave 7.2

Sizing Guide

Copyright

© 2011 Dell PowerConnect W Networks, Inc. Dell PowerConnect W Networks trademarks include

W Networks ® , Dell PowerConnect W Wireless Networks

PowerConnect W Mobility Management System

Island ® trademarks of Dell Inc.

®

®

, Dell PowerConnect

, the registered Dell PowerConnect W the Mobile Edge Company logo, Dell

, Mobile Edge Architecture ® , People Move. Networks Must Follow ® , RFProtect ® , Green

. All rights reserved. All other trademarks are the property of their respective owners. Dell™, the Dell™ logo, and PowerConnect™ are

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 Guide 0510830-01 | April 2011

Contents

About this Guide .......................................................................................................................................................3

Document Organization..................................................................................................................... 3

Note, Caution, and Warning Icons .................................................................................................. 3

Contacting Support ........................................................................................................................... 4

Chapter 1 Sizing Overview....................................................................................................................5

CPU and Memory Matrix................................................................................................................... 5

Storage Matrix .................................................................................................................................... 6

Chapter 2

Chapter 3

Appendix A

CPU, BIOS, Operating Systems, and Storage .................................................................7

CPU and BIOS ..................................................................................................................................... 7

Intel Nehalem and Westmere Architecture Information..................................................... 7

AMD Information........................................................................................................................ 7

Operating System ............................................................................................................................... 7

Storage................................................................................................................................................. 8

RAID Configuration Information............................................................................................... 8

200 Devices and Below ..................................................................................................... 8

500 - 1,000 Devices............................................................................................................. 8

1,000 - 2,500 Devices.......................................................................................................... 8

2,500 - 5,000 Devices Non-SSD Drives............................................................................ 8

2,500 - 5,000 Devices SSD Drives..................................................................................... 8

Disk Partitioning.......................................................................................................................... 9

Storage System Tuning ............................................................................................................. 9

Virtualization and Scalability ...........................................................................................11

Virtualization...................................................................................................................................... 11

Scalability Assumptions .................................................................................................................. 12

Miscellaneous Sizing Information ..................................................................................15

AMD Hardware................................................................................................................................. 15

Dell PowerConnect W AirWave 7.2 | VisualRF User Guide | 1

2 | Dell PowerConnect W AirWave 7.2 | VisualRF User Guide

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

Chapter 1, “Sizing Overview” on page 5

Chapter 2, “CPU, BIOS, Operating

Systems, and Storage” on page 7

Chapter 3, “Virtualization and

Scalability” on page 11

Appendix A, “Miscellaneous Sizing

Information” on page 15

Description

Provides an overview of the sizing information.

Details information about the CPU, BIOS, Operating systems, and storage systems of

AWMS.

Discusses virtual machines and scaling of AWMS.

Includes specifications on AMD Hardware.

Note, Caution, and Warning Icons

This document uses the following 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 7.2 | Sizing Guide About this Guide | 3

Contacting Support

Table 2 Website contact

Web Site

Main Website

Support Website

Documentation Website dell.com

support.dell.com

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

Devices

CPU Class

Pilot 1-25 APs Quad Core Intel®

Xeon X3430

100

200

Quad Core Intel®

Xeon X3440

Quad Core Intel®

Xeon X3460

500

1,000

2,500

2,500 +

Quad Core Intel®

Xeon X5540

Quad Core Intel®

Xeon X5560

Quad Core Intel®

Xeon X5560

Hex Core Intel®

Xeon X5680

Clock Speed

(GHz)

2.4

2.53

2.8

2.53

2.8

2.8

3.33

CPUs

1

1

1

1

1

2

2

4

4

4

4

8

12

Total

Cores

4

AWMS

Memory

3 GB

RAPIDS

Memory

.5 GB

VisualRF

Memory

.5 GB

4 GB

4 GB

4 GB

6 GB

16 GB

24 GB

1 GB

2 GB

2 GB

3 GB

4 GB

6 GB

1 GB

2 GB

2 GB

3 GB

4 GB

6 GB

Storage Matrix

Table 4 Storage

Number of

Devices

Min. AWMS

Storage

100

200

500

1,000

2,500

2,500 +

*75 GB

75 GB

75 GB

75 GB

187 GB

300 GB

Max. AWMS

Storage

75 GB

75 GB

75 GB

150 GB

375 GB

600 GB

*IOPS

2 x random writes to reads

60

120

300

600

1,500

3,000

Storage System

(1) Drive 15K RPM

(1) Drive 15K RPM

Multiple 15K RPM RAID Drives

Multiple 15K RPM RAID Drives

Multiple 15K RPM RAID Drives

Multiple 15K RPM & SSD RAID Drives

* 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.

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 8

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 Node 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 is 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 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 disk 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.

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

/ boot swap

Size

100 MB

Twice size of RAM

Rest of disk space

Table 6 Advanced Partitions

Default Partitions boot

/ swap

/alternative

/var/log

/var/lib/pgsql

/var/airwave/rrd

/var/airwave-backup

Purpose

Boot partition

Swap partition

AWMS

Database backup location

All log from all services

PostgreSQL database files

Statistical flat files

Nightly backup location

Recommended Size

100 MB

Twice size of RAM

25% of total disk space

10% of total disk space

5% 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 sustain 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 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:

CFQ - 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 CFQ 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/<device>/queue/scheduler.

NOTE: Contact support.dell.com

prior to changing this setting.

10 | CPU, BIOS, Operating Systems, and Storage Dell PowerConnect 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

Devices

CPU Class

Clock Speed

(GHz)

Pilot 1-25 APs Quad Core Intel® Xeon X3430 2.4

CPUs

1

Total

Cores

4

Max

Memory

3 GB

Sustained

IOPS

30

100

200

500

Quad Core Intel® Xeon X3440 2.53

Quad Core Intel® Xeon X3460 2.8

Quad Core Intel® Xeon X5540 2.53

1

1

1

4

4

4

6 GB

8 GB

8 GB

60

120

300

1,000

2,500

2,500 +

Quad Core Intel® Xeon X5560 2.8

Quad Core Intel® Xeon X5560 2.8

Hex Core Intel® Xeon X5680 3.33

1

2

2

4

8

12

12 GB

24 GB

48 GB

600

1,500

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

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)

Value

10

15

15

20

30

60

5

10

5

Daily

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

Table 9 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 10 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)

Value

8

8

20

20%

36

8

Value

20

15

62,500

20

100

2,500

12 | Virtualization and Scalability Dell PowerConnect W AirWave 7.2 | Sizing Guide

Table 10 VisualRF Scalability Test Values (Continued)

Category

Rogue location timer (minutes)

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

Value

30

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

Devices

500

1,000

2,000

CPU Class

Clock Speed

(GHz)

Quad Core AMD Opteron™ 8387 2.8

Quad Core AMD Opteron™ 8387 2.8

Quad Core AMD Opteron™ 8435 2.6

1

2

2

4

8

12

AWMS

Memory

RAPIDS

Memory

VisualRF

Memory

4 GB

10 GB

12 GB

2 GB

3 GB

6 GB

2 GB

3 GB

6 GB

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

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