Pause while selecting INBOX
mills at cc.umanitoba.ca
Sat Sep 27 20:39:43 EDT 2008
On Sat, Sep 27, 2008 at 01:46:39PM +1000, Rob Mueller wrote:
> >Where's the first place to look for this problem? I/O statistics
> >show a higher read bandwidth while the backup is running, but writes
> >still dominate. The backup would typically read all of the files in
> >a single Cyrus partition.
> Some more information about your setup would be helpful.
I deliberately omitted that information, hoping that somebody would
know what happens on the server side when mutt says `selecting INBOX'.
I don't want to redesign the server at this stage, at least not until
I've isolated the problem.
> 1. Make sure you have noatime (and nodiratime if applicable) set on your FS
> 2. If on linux, use the deadline IO scheduler
> 3. If you can, split your data and meta data onto separate volumes
> (probably a lot of work)
> 4. Install more RAM and use a 64-bit OS. x64_64 linux can cache many, many
> more inodes and dentries in memory than x86 linux.
> 5. Upgrade to the latest cyrus and enable the status cache
Those are all good suggestions. I'll investigate some of them.
-Gary Mills- -Unix Support- -U of M Academic Computing and Networking-
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