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Channel: Comments on: Citrix PVS: Optimize endpoint with PowerShell
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By: Jonathan Pitre

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Well done guys. I’ve wanted to script theses taks for my self for quite some time!

I have a couple of suggestions to add:

-ARP Cache Changes
-Failover Times
- Locate the HKLM\System\CurrentControlSet\Services\Afd\Parameters registry key.
Add the value FastSendDatagramThreshold of type DWORD equal to 1500.

-[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\BFE\Parameters]
“MaxEndpointCountMult”=dword:00000010 (See kb2685007 & kb2524732)

Sources:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2040065
http://support.citrix.com/article/CTX119223
http://support.citrix.com/article/ctx127549

Also to disable IPV6 I would recommend using the reg key instead since there is known issue when you unselect it it in the network adapter settings

According to MS: “User logons from domain-joined W7 clients normally take 30 seconds but intermittently take 8 minutes. XPERF shows that a series of logon scripts called by Group Policy preferences to establish mapped network drives are taking a long time to execute. A network trace shows clients experiencing slow logons authenticating with a local DC, pulling policy from a local DC but sourcing scripts defined in Group Policy preferences from a remote DC half-way around the world. On the client computer, IPv6 is bound in Network Connections in Control Panel (NCPA.CPL) but unbound on all DCs (that is, the TCP/IPv6 check box is cleared in the network adapter properties).

Clearing the IPv6 check box does not disable the IPv6 protocol.

Enabling the IPv6 binding in NCPA.CPL and setting disabledcomponents=FFFFFFFF on the Windows 7 client results in consistently fast logons as Group Policy preferences scripts are sourced from the local DC. One change to investigate is whether creating IPv6 subnet and subnet-to-site mappings would have resolved this problem.”

http://social.technet.microsoft.com/wiki/contents/articles/10130.root-causes-for-slow-boots-and-logons-sbsl.aspx


By: Ingmar Verheij

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Hi Jonathan,

Thanks for the detailed response and suggestions. I will store them for a future version of the script.

Cheers,
Ingmar

By: Magnar Johnsen

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I’ve heard someone from citrix says not do disable task offload from Win2k8r2 and up and PVS 6.x, this used to be a problem in w2k3.

By: Ingmar Verheij

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Do you have more info on that? I do know you don’t have to set the BNNS registry from PVS 6.x, but that’s easy since it doesn’t exist anymore :-)

By: Jonathan Pitre

By: Ingmar Verheij

By: Ingmar Verheij

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In case you’ve downloaded version 1.4 and receive messages about missing devon or nvspbind, I forgot to included them in the archive. Their included now!

By: Jonathan Pitre


By: Hani

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Hi Ingmar,

Do you know which of these improvements apply to normal XS 6.2,

i see some of these are specific to PVS but most of them apply to normal xenserver installation

Thanks

By: Ingmar Verheij

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Hi Hani,

The script is built for PVS but also applies generic optimizations (like removing a ghost NIC and disabling IPv6). Nonetheless I would not recommend running the script on any VM. Best practices should only be applied in the context where they apply.

Ingmar

By: Jeremy Saunders

By: Ingmar Verheij+

By: Ingmar Verheij

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In case you’ve downloaded version 1.4 and receive messages about missing devon or nvspbind, I forgot to included them in the archive. Their included now!

By: Jonathan Pitre

By: Hani

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Hi Ingmar,

Do you know which of these improvements apply to normal XS 6.2,

i see some of these are specific to PVS but most of them apply to normal xenserver installation

Thanks


By: Ingmar Verheij

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Hi Hani,

The script is built for PVS but also applies generic optimizations (like removing a ghost NIC and disabling IPv6). Nonetheless I would not recommend running the script on any VM. Best practices should only be applied in the context where they apply.

Ingmar

By: Jeremy Saunders

By: Ingmar Verheij+

By: Nawir

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SW INFO:
XS6.2SP1
PVS7.1
WIN2K8R2

I have 2 nics in my PVS server.
1 nic for join domain (with gw), 1 nic for PVS streaming.
If I disable LargeSendOffload in domain nic, it will cause problem transferring 17GB win7 vdisk to other PVS server.
In 3% it will disconnect.
Once I enable back LargeSendOffload in domain nic, it back to normal.
I think still fine if I disable LargeSendOffload in PVS streaming nic.

By: Ingmar Verheij

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Hi Nawir.
There’s no need to disable LargeSendOffload on the domain NIC, only the PVS streaming NIC.

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