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Server Sizing Guide
OmniVista 3600 Air
Manager 7.7
Copyright
© 2013 Alcatel-Lucent. All rights reserved.
Specifications in this manual are subject to change without notice.
Originated in the USA.
AOS-W, Alcatel 4302, Alcatel 4304, Alcatel 4306, Alcatel 4308, Alcatel 4324, Alcatel 4504, Alcatel 4604, Alcatel 4704, Alcatel 6000, OAW-AP41, OAW-AP68, OAW-AP60/61/65, OAW-AP70, OAW-AP80, OAW-AP92/93, OAW-AP105, OAWAP120/121, OAW-AP124/125, OAW-AP175, OAW-IAP92/93/105, OAW-RAP2, OAW-RAP5, and Omnivista 3600 Air Manager
are trademarks of Alcatel-Lucent in the United States and certain other countries.
Any other trademarks appearing in this manual are the property of their respective companies. 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.
Legal Notice
The use of Alcatel-Lucent switching platforms and software, by all individuals or corporations, to terminate Cisco or Nortel
VPN client devices constitutes complete acceptance of liability by that individual or corporation for this action and
indemnifies, in full, Alcatel-Lucent from any and all legal actions that might be taken against it with respect to infringement of
copyright on behalf of Cisco Systems or Nortel Networks.
July 2013 | 0510805-08
OmniVista 3600 Air Manager 7.7 | Server Sizing Guide
Contents
Chapter 1 Selecting Your Hardware Components
5
CPU, Memory, and Storage Matrix
5
Assumptions
6
Choosing Your CPU
7
Choosing Your Memory
7
Choosing Your RAID Controller
7
RAID Configuration Information
7
200 Devices and Below
8
500 Devices
8
1,000 Devices
8
1,750 Devices
8
2,500 Devices
8
5,000 Devices - Non-SSD Drives
8
5,000 Devices - SSD Drives
8
Choosing Your Hard Drives
SSDs vs 15K SAS
Chapter 2 Configuring Your Hardware
8
9
10
CPU Configuration
10
Disk Partitioning
10
Filesystem Configuration
10
Chapter 3 Virtualization and Scalability
11
Virtualization
11
Scalability Assumptions
11
Appendix A Sizing a Failover Server
Failover Server
OmniVista 3600 Air Manager 7.7 | Server Sizing Guide
13
13
Contents | iii
iv | Contents
OmniVista 3600 Air Manager 7.7 | 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 OV3600 7.7.
This section includes the following topics:
l
"CPU, Memory, and Storage Matrix" on page 5
l
"Choosing Your CPU" on page 7
l
"Choosing Your Memory" on page 7
l
"Choosing Your RAID Controller" on page 7
l
"Choosing Your Hard Drives" on page 8
CPU, Memory, and Storage Matrix
The following table lists the recommended specifications for optimum OV3600 server performance.
Table 1: Recommended CPU, Memory, and Storage
Devices
CPU
Less than 500
RAM
(GB)
Disk Config
8
IOs Needed
by OV3600
Storage (GB)
50
75
500
Intel® Core™ i32220 @ 3.30GHz
16
6x 146GB 15k
RAID 10
300
410
1000
Intel Core i5-3570
@ 3.40GHz
32
10x 146GB 15k
RAID 10
600
685
1500
Intel® Xeon® E52660 @ 2.20GHz
48
12x 146GB 15k
RAID 10
900
821
4000
Dual Intel Xeon
E5-2660 @
2.20GHz
80
16x 146GB 15k
RAID 10
2400
1095
5000
Dual Intel Xeon
E5-2690 @
2.90GHz
96
18x 146GB 15k
RAID 10
3000
1232
5000 SSD
Dual Intel Xeon
E5-2690 @
2.90GHz
96
6x 500GB SSD
RAID 10
3000
1397
Ensure that the disk subsystem can sustain 4KB random write rates. Sustained sequential write rates will not help because
OV3600 writes are primarily random.
OmniVista 3600 Air Manager 7.7 | Server Sizing Guide
Chapter 1 Selecting Your Hardware Components | 5
The following table lists the minimum specifications required to run OV3600.
Table 2: Minimum CPU, Memory, and Storage
Devices
Appliance
Name
CPU
Less than
500
RAM
(GB)
Disk Config
4
IOPs
Storage
(GB)
30
75
500
Intel Core i3 550
@ 3.20GHz
8
4x 146GB 15k
RAID 10
300
273
1000
Intel Xeon E51603 @ 2.8 GHz
16
6x 146GB 15k
RAID 10
600
410
1500
OV3600HWPRO*
Intel Xeon E52640 @ 2.50GHz
32
6x 146GB 15k
RAID 10
900
410
4000
OV3600HWENT*
Dual Intel Xeon
E5-2640 @
2.50GHz
64
8x 146GB 15k
RAID 10
2400
548
* These systems represent appliances that are available from Alcatel-Lucent.
Assumptions
The recommendations provided in this document are based on extensive testing scenarios run in house. The following
assumptions are common across these tests. If your particular environment differs significantly in any of these
dimensions, then this Server Sizing Guide might not be appropriate for your situation.
Table 3: Assumptions used during testing
Item
Assumption
% Switches
20%. Note that doubling the wired switch/total device ratio from 20% to 40% results in a 20%
decrease in the number of devices for which the system can process data. (For example, the ENT
system is rated for 3200 devices at 40% wired switches.)
Syslog
messages per
second
(continuous)
PRO: 125 messages per second
ENT: 250 messages per second
Client traps per
second
(continuous)
PRO: 50
ENT: 100
Roaming Rate
per second
l
Client historical
retention
In OV3600 Setup > General, the Client Association and VPN History option is set to 14 days.
Reporting rate
OV3600 default reports and reporting rate.
This value should equal approximately 1/3 the value of client traps that result in actionable items.
PRO: 17 (approximately)
l ENT: 33 (approximately)
6 | Chapter 1 Selecting Your Hardware Components
OmniVista 3600 Air Manager 7.7 | Server Sizing Guide
OV3600 includes the 64-bit CentOS operating system based on Red Hat Enterprise Linux (RHEL), and that 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 margins for WLAN expansion as well as for future OV3600 features and modules.
These recommended specifications are formulated to keep OV3600 running on the same hardware platform for up to
three years.
To ensure hardware capability, purchase server hardware that is certified to be compatible with Red Hat Enterprise Linux 5
(RHEL5).
Additional factors that can influence the processing requirements for your OV3600 server:
l
How many devices will the server manage?
l
How often will OV3600 communicate with these devices?
Choosing Your CPU
For most OV3600 installations, Alcatel-Lucent recommends selecting high-performance Xeon E-series CPUs.
Alcatel-Lucent performs scalability testing using Intel based hardware at this time. See Table 1 in "CPU, Memory, and
Storage Matrix" on page 5 for recommendations on CPU selection based on clock speed and core type.
Choosing Your Memory
OV3600’s memory recommendations scale linearly with the managed device count.
With OV3600 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 OV3600.
Software RAID and SATA drives are NOT SUPPORTED for any configuration of OV3600.
RAID Configuration Information
For RAID 1+0:
l
Dedicated Hardware RAID controller with caching and battery backup or non volatile (NV) cache.
l
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).
l
Individual Drive Caching should be enabled.
l
Ensure that all disks are assigned and configured to a single volume.
Improper RAID configuration can result in drastically reduced server performance.
OmniVista 3600 Air Manager 7.7 | Server Sizing Guide
Chapter 1 Selecting Your Hardware Components | 7
200 Devices and Below
OV3600 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.
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, (Refer to "CPU, Memory, and Storage
Matrix" on page 5 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 OV3600 server.
If you have any questions regarding hardware compatibility or selection, contact Alcatel-Lucent support.
OV3600 servers servicing more than 2,500 devices require 64-bit OS and OV3600 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 OV3600 server.
8 | Chapter 1 Selecting Your Hardware Components
OmniVista 3600 Air Manager 7.7 | Server Sizing Guide
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.
OV3600 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 OV3600 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 Alcatel-Lucent support.
OmniVista 3600 Air Manager 7.7 | Server Sizing Guide
Chapter 1 Selecting Your Hardware Components | 9
Chapter 2
Configuring Your Hardware
This section explains sizing information for the following topics:
l
"CPU Configuration " on page 10
l
"Disk Partitioning" on page 10
l
"Filesystem Configuration" on page 10
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
OV3600 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
4 GB
/
Remainder of disk space
Filesystem Configuration
For OV3600, the NOOP File I/O scheduler provides the best random write performance. If you are running OV3600 7.2
or later, OV3600 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)
OmniVista 3600 Air Manager 7.7 | Server Sizing Guide
Chapter 2 Configuring Your Hardware | 10
Chapter 3
Virtualization and Scalability
This section includes the following topics:
l
"Virtualization" on page 11
l
"Scalability Assumptions" on page 11
Virtualization
OV3600 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. OV3600 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 5 section, the hardware for virtualization should exceed these specifications by 20%.
Alcatel-Lucent 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 5 section, Alcatel-Lucent
continually tests scalability based on the following assumptions. Deviations from these assumptions can impact overall
scalability of your OV3600 server.
Table 5: Wireless Scalability Test Values
Category
AP Interface polling period
10
Device-to-device link period
5
CDP neighbor data polling
30
Ratio of switches/routers to access points
25%
Read ARP polling (hours)
4
Read CDP table for device discovery polling (hours)
4
Read bridge forwarding table polling (hours)
4
Interface Up/Down polling period
10
Auditing more than once a day can have a tremendous impact on scalability.
OmniVista 3600 Air Manager 7.7 | Server Sizing Guide
Chapter 3 Virtualization and Scalability | 11
Table 6: Wired Scalability Test Values
Category
Ratio of switches/routers to access points
25%
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
Table 7: VisualRF Scalability Test Values
Category
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
OV3600 Synchronization timer (minutes)
15
Rogue location timer (minutes)
30
Location calculation timer (min/max/number of samples)
90/360/3
12 | Chapter 3 Virtualization and Scalability
OmniVista 3600 Air Manager 7.7 | Server Sizing Guide
Appendix A
Sizing a Failover Server
Failover Server
The Failover server should be as powerful as the most powerful OV3600 server that it monitors to ensure smooth
operation in a failover situation.
OmniVista 3600 Air Manager 7.7 | Server Sizing Guide
Appendix A Sizing a Failover Server | 13
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