[THIN] Re: XenServer Slowdown

  • From: "Joe Shonk" <joe.shonk@xxxxxxxxx>
  • To: <thin@xxxxxxxxxxxxx>
  • Date: Wed, 17 Nov 2010 14:05:25 -0700

32 gigs is the limit for Windows Server Standard 2008 x64.  Enterprise will
do 1 terabyte.


The one thing that jumps out at me is the number 36.  Generally with a 2
proc Nehalem based system you would expect to see memory in the following
multiples: 1, 12, 24, 48 or 96.  Yes there are other memory configurations
that work but they generally indicate that the memory is not optimized.


The number 36 means to me that you're running either (6 x 4gb dimms + 6 x
2gb dimms) or (18 x 2gb dimms).  The later configuration would choke your
memory bus speed from 1333MHz to 800 MHz.


I would also check to see what rank the dimms you have are.




From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf
Of James Scanlon
Sent: Wednesday, November 17, 2010 9:46 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: XenServer Slowdown


XenApp - Correct

Windows 2008 SP2 - not R2,

Windows system reports 36GB in system properties, HP SIM reports 32GB of ram
addressable / available - WTF? - chasing this up for further details....... 



From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf
Of Joe Shonk
Sent: 17 November 2010 16:28
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: XenServer Slowdown

I'm going to out on a limb and assume that you are referring to XenApp and
not XenServer.


First question, why Windows 2008 Standard x64?

                Windows 2008 R2 is going to be a much better choice,
especially if you are running this directly on new hardware.

                Second, Standard edition only support 32 gigs and you're
showing 36 gigs


Also, which metric is sitting at 25% utilized?




From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf
Of James Scanlon
Sent: Wednesday, November 17, 2010 8:45 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: XenServer Slowdown



(sorry about last unfinished email went to save to get more info and clicked
send - sigh)


We are having speed issues with our XenServers 

*       Brand New builds 
*       Deployed with Altiris 
*       Xenserver 5.0 
*       Windows 2008 Standard 64bit 
*       36GB RAM 
*       Dual CPU, 8 Core processors X5560 2.80Ghz 
*       Appsense EM and PM (with citrix CPU and memory management disabled) 
*       Sophos AV 
*       HP Hardware DL380 G6 with teamed nics

For normal operation we are getting 25 second login time (to desktop)


After approx 30 users (or 2 days without a reboot), the performance drops to
1-1.5 minutes just to log in, everything sluggish, cant open task manager
even though multiple taskman icons appear in systray.

No performance issues on the systems themselves, all sitting around %25
utilised. (CPU, MEM, DISK etc)


So far:

We have disabled Sophos, no result

disabled Appsense, no result

turned on VT instructions for CPU in the BIOS, no result

turn off TCP offloading for the NICS

HW firmware for Servers / patching (latest PSP)
Software for OS and apps / patching 



Any one seen anything like this already? apart now from bringing up a VM
host to eliminate hardware or a full manual rebuild and testing at each
stage of the build process - we are starting to run out of 'obvious ideas'

ANY assistance and advice greatly appreciated!









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