Doug John is spot on - only PHANTOMS from root crontab please. Of course you have to run a foreground shell to launch the PHANTOM so please use one of 3 options:
1. Don't use root 2. Use great care and make sure there are no overlap opportunities (one at a time) 3. Use an OS level "Lock" file and launch a script to launch the PHANTOM. The script checks if the specified "lock file" exists and if so sleeps for a short and random time - trying again. If it doesn't exist it creates the file by echoing it's PID into the file, and then reads the file back to check it only contains this process' PID. If so we have a GO and a UC process can be used to fire a PHANTOM - when launched the lock file is deleted. If not then try again (etc). You might want to build in some "retry" check as well in case a stale lock file gets left for some reason. Elegant? No - Works? - Pretty much.... My preference is "why root"? Regards JayJay -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of John Hester Sent: 14 December 2007 21:40 To: u2-users@listserver.u2ug.org Subject: RE: [U2] anyone seen this error before? > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Doug Chanco > Sent: Friday, December 14, 2007 5:00 AM > To: u2-users@listserver.u2ug.org > Subject: RE: [U2] anyone seen this error before? > > Actually I think that's exactly what we are doing! > > dougc You want to make sure you only run UV cron jobs as phantoms. If you run them in the foreground they will all use the same shared memory segment. If you ever have 2 UV foreground cron jobs overlap, you could have problems ranging from the processes crashing to file corruption. Here's an example of one of our UV cron jobs: umask 002 UV=`cat /.uvhome`/bin/uv cd /uvdata/FABRIC.PROD $UV "PHANTOM PGMDP0413" -John ------- u2-users mailing list u2-users@listserver.u2ug.org To unsubscribe please visit http://listserver.u2ug.org/ ------- u2-users mailing list u2-users@listserver.u2ug.org To unsubscribe please visit http://listserver.u2ug.org/
