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May, 2012

XenApp & XenDesktopBest Practices

Andy Baker & Thomas Berger


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2012 Citrix | ConfidentialDo Not Distribute

Introduction

Why did you create a best practicesdocument?

What is a best practice anyway?

Appropriate at least 80% of the time

Provides a good starting point

Where do the best practices come from? Lessons learned

Engineering

Testing

Customer feedback

Desktops

Users

Applications

Personalizatio

Access

Hardware


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Best PracticesTop 10


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#1: Scale Up or Out?

There are many components: Hardware & appliances Infrastructure servers

XenApp servers

Theres a lot to consider: Available space

Cooling & power capacity

Hardware & maintenance costs

Single points of failure

Too many eggs


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#2: Hyper-threading

Allows single physical processor to appear as twovirtual cores

Can increase user density per VM (XenApp) and

VM density per host (XenApp and XenDesktop)

Typical performance boost of between 20-30% -

NOT 100%!

My not be beneficial in every situationwill

depend on workload


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#3: Processor and Memory Overcommit

XenApp Users per core30 [Light], 15 [Medium], 7 [Heavy] 1 to 1 mapping between vCPUs and cores

Dont overcommit memory

XenDesktop Users per core - 10 [Light], 6 [Medium], 2 [Heavy]

Careful when overcommitting memory (5-10%)

Dont forget the hypervisor!


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#4: XenServer Pool Design

Separate resource pools for: Control infrastructure XenDesktop

XenApp

Maximum pool size: 16 hosts without single image technology

12 hosts with PVS

8 hosts with MCS

Redundancy Enable HA

Specify multiple servers in host connection


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#5: XenServer 6.02 Optimizations

Use processors that support nested paging and second level addr Extended Page Tables (Intel) Rapid Virtualization Indexing (AMD)

Optimize for XenApp was essentially a software implementation

Disable power saving (Green IT) functions in BIOS

If you have more than 50 VMs per host - increase DOM0 RAM fro

2.94GB Receiver Side Copy (RSC)

Enabled by Default

Work offloaded from DOM0 to guests (increases DOM0 scalability)

Disable for small number of network intensive VMs (e.g. Provisioning Se


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#6: Storage Best Practices

Storage is a very complex topic CTX118397Introduction to Storage Technologies CTX130632Storage Best Practices

Make sure you understand the requirements Storage space vs. Speed

Track the respective Win/XS performance counters i.e.: Physical Disk \ Disk Transfers/sec = IOPS

Monitor disk latency at all times 20ms = Issue


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#7: License Server Redundancy

Typically a single Citrix License Server is

sufficient Grace period of 30 days

5 second delay for new user sessions

Provisioned XA servers are an exception Licenses are cached within a local ini-file

ini-file is updated on IMA startup

CTX131202 describes how to redirect the ini-

file to a network share / persistent disk


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#8: Antivirus Optimizations

Optimizing AV for a virtual desktop environment is

a must.

Follow the recommendations outlined in

CTX127030

In addition Disable scheduled scans (i.e. upon pattern retrieval)

Test new pattern before rollout / stagger the rollout


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#9: PVS Ports & Threads

By default PVS uses 20 TCP ports for streaming

8 Threads per port

= 160 Threads

Every target device uses one thread

when reading from its vDisk

No thread available = queuing = disk latency

# of ports x # of threads/port = max active clients Consider HA scenarios


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#10: Various Items

Have a proper monitoring solution in place Monitoring Guide is coming soon

Perform Capacity Planning

Implement a three-staged test environment at minimum Dev/Test

UAT

Pre-Production Production

Develop/Implement Change Management procedures

Backup your environment / perform restore tests


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Summary


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Summary

Were constantly refining the document Subscribe to the Citrix KB RSS feed

Subscribe to the XD Handbook (http://bit.ly/xdhandbook)

..or check CTX132799 every month or so

If you have feedback / suggestions drop us a mail Andy Baker ([email protected])

Thomas Berger ([email protected])
http://bit.ly/xdhandbookmailto:[email protected]:[email protected]:[email protected]:[email protected]://bit.ly/xdhandbook


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Q&A


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Work better. Live better.

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