Hello All, I've been implementing IBM's MQ series on zLinux machines to replace our current architecture of MQ on Windows. To do so, however, I have to reach back to our Active Directory server for group enumeration to figure out which MQ objects a particular MQ client can read/update/modify etc. I've been able to make that work with a few restrictions but I do have an outstanding problem.
Occasionally, but not always, MQ stalls for a long time (minutes) when reloading the authorization tables. The correct answer is always returned, but a 60 second delay is above the threshold for error processing for some of our systems. Normally, that reload occurs in sub second time. When the stall does occur, I've used top to see what's happening on the system. 'winbind' is the top application and it stays busy for the duration of the stall. No surprise there, just confirmation. To boil this problem down a bit, I can replicate the same behavior using the command 'wbinfo -g'. Usually, the command will return all of the results sub second. Occasionally, it'll take 15 to 60 seconds before the first record is returned. It always eventually returns the full set of data. I can usually (BUT NOT ALWAYS!) replicate the 'wbinfo -u' stall conditions two ways: 1 - Restart winbind. The first wbinfo request will be delayed. Subsequent requests are sub-second. 2 - Wait for a while - about 5 minutes. Then do 'wbinfo -u'. It'll usually be delayed. Because of the time delay, it does seem like a caching problem. I've dismissed (perhaps wrongly) the AD server because I can recreate the stall in short time by cycling winbind. Also, I'm lucky enough to have a couple of AD domains because of my Windows group's test environments. Both exhibit the same behavior. So my questions for the list are these: 1 - Is anybody else doing a similar function? zLinux to AD for group enumeration? I have examples of the needed /etc/config files if you'd like some guidance on how to set this up. 2 - If you are doing it, have you experienced a similar occasional 'stall'? 3 - Any suggestions for resolution? Config file, details, timings, gladly provided upon request. Tim tim.mo...@srpnet.com ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
