Yeah, I thought the same thing when I typed it up. My best guess is a memory leak or a bad driver. From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Dan Dill Sent: Wednesday, November 17, 2010 3:45 PM To: thin@xxxxxxxxxxxxx Subject: [THIN] Re: XenServer Slowdown While it's good to nail down the memory config it seems strange that the memory would affect the server coming to a crawl after a period of time.. That symptom more points to software I would think. Dan Dill From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Berny Stapleton Sent: Wednesday, November 17, 2010 2:21 PM To: thin@xxxxxxxxxxxxx Subject: [THIN] Re: XenServer Slowdown Don't forget the toss up between UDIMM vs RDIMM. UDIMM is faster than RDIMM but not registered, there is a memory limit on the amount of UDIMM you can run as well. Depending on the situation your in, this might be a trade off your willing to make. Berny On Wed, Nov 17, 2010 at 9:05 PM, Joe Shonk <joe.shonk@xxxxxxxxx> wrote: 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. Joe 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? Joe 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 Greetings (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! JAMES ______________________________________ C. Hoare & Co. is authorised and regulated by the Financial Services Authority with registration no. 122093. The FSA's address is 25, The North Colonnade, Canary Wharf, London E14 5HS. Registered in England no. 240822. 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