Pause while selecting INBOX
mills at cc.umanitoba.ca
Fri Sep 26 09:44:35 EDT 2008
We have a moderately sized Cyrus installation with 2 TB of storage
and a few thousand simultaneous IMAP sessions. When one of the
backup processes is running during the day, there's a noticable
slowdown in IMAP client performance. When I start my `mutt' mail
reader, it pauses for several seconds at `Selecting INBOX'. That
behavior disappears when the backup finishes.
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.
-Gary Mills- -Unix Support- -U of M Academic Computing and Networking-
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