> This is interesting because I have a linux box (RedHat AS3) using RAID 10. > I > have some 5000 user accounts and anywhere from 2500 to 3000 concurrent > IMAP > sessions -- I think the Mulberry client opens multiple sessions since it's > only some 300 to 500 individual concurrent users. Anyway, what I > especially > notice is that when the mail delivery queue on the MTA gets very large, > which > happens occassionally, the CPU load average goes way up and iowait time as > displayed using top can exceed 300% on a four processor box and > performance > goes all to heck. Is switching the filesystem to XFS likely to help this > situation? Since there is some 80GB of mail spool currently in use, > switching the filesystem to XFS is not a simple task and I don't won't to > do > it on a lark.
Your only problem here is that RedHat removes XFS from it's enterprise kernels so you can't use it. I really blame RedHat for it. If you have paid for your RedHat AS, I stronlgy suggest you complain there to get this fixed. They could include the XFS kernel module in the unsupported package. Simon > > Thanks, > Rob > > > --On Wednesday, December 01, 2004 12:14:01 PM -0800 David Lang > <[EMAIL PROTECTED]> wrote: > >> I've done some testing and seen a HUGE speedup when switching from >> EXT2/3 >> to XFS. unfortunantly I haven't had a chance to do the same comparison >> with >> Reiserfs (I need to, but haven't had time) >> >> I was even able to see a dramatic difference with a single user >> accessing a >> fairly large mailbox (thousands of messages in the inbox) >> >> David Lang >> > > > -- > Rob Tanner > UNIX Services Manager > Linfield College, McMinnville OR > > --- > Cyrus Home Page: http://asg.web.cmu.edu/cyrus > Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu > List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html > > --- Cyrus Home Page: http://asg.web.cmu.edu/cyrus Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
