Hi People, Had a "fascinating" time on a customer site yesterday that I thought might be worth reporting. I've known for a long time that back-end or network performance issues can severelt impact on TS server performance, and in worst case scenarios, can result in complete server lockups. What made things interesting is that a previosusly stable site had 4 TS systems (2003/MF XP FR3) that had been running without problems. ON the weekend, the customer ran windows update on all their servers, and on Monday morning, the TS systems started hanging once they had been running for 1-2 hours. The customer was "fixing" things by rebooting the systems, and finally called us on Wednesday PM. Had another customer call a couple of hours later with hang problems post the latest security hotfixes so the immediate reaction was bloody Microsoft and their lack of regression testing on security hotfixes. Wrong.=20 Spent yesterday afternoon reverting the systems to a pre-hotfix image, and the hangs continued. Then I found the culprit. The customers main file/print server an IBM NAS system, had lost a disk and was running in degraded mode. Best file transfer rates I could get in an out of the file/print server were 1.5-2 MB per second. In fact, while I was copying a GB of data from the file/print server to one of the TS systems, the TS system locked up hard. The admins home drive locked up, and any I/O that required an SMB transaction just hung. However, I was logged on via an ICA session, and had the computer management MMC module open. It still worked, and as a test I was able to run a local disk defrag etc. But anthing that used the workstation service (redirector) was dead, including the IMA service etc. I unsuccessfully tried to restart the workstation service so ended up rebooting the serevr. What made this all interesting is that I was able to poke around the inside of a "hung" server. I'd always "known" that this sort of hang was caused by SMB performance issues, but this was the first time I'd been able to confirm it absolutely. The SMB redirector error handling hasn't improved from NT 4 to Windows 2000 to 2003. It still sucks ;-). Anyway the fix was to get the file/print server back up to speed by fixing the RAID array. Regards, Rick=20 Ulrich Mack rmack@xxxxxxxxxxxxxx=20 Volante Systems 18 Heussler Terrace, Milton 4064=20 Queensland Australia.=20 tel +61 7 3246 7704=20 ******************************************************** This Week's Sponsor - Tarantella Secure Global Desktop Tarantella Secure Global Desktop Terminal Server Edition Free Terminal Service Edition software with 2 years maintenance. http://www.tarantella.com/ttba ********************************************************** Useful Thin Client Computing Links are available at: http://thin.net/links.cfm *********************************************************** For Archives, to Unsubscribe, Subscribe or set Digest or Vacation mode use the below link: http://thin.net/citrixlist.cfm