Sergio Devojno Bruder
bruder at haxent.com.br
Sun Nov 6 00:58:15 EST 2005
John Madden wrote:
> I've had great experience with the performance of Cyrus thus far, but I'm testing
> a migration at the moment (via imapcopy) and I'm having some pretty stinky
> results. There's no iowait (4 stripes on a 2Gbps SAN), no cpu usage, nothing
> waiting on the network, and still I'm seeing terrible performance. I assume this
> points to something internal, such as concurrency on the db files.
> I've converted everything to skiplist already, I've tweaked reiserfs's mount
> options, what little Berkeley still used appears to be ok (no waiting on locks and
> such), so I'm at a loss. Is there a general checklist of things to have a look
> at? Are their tools to look at the metrics of the skiplist db's (such as
> Berkeley's db_stat)? Am I doomed to suffer sub-par performance as long as IMAP
> writes are happening?
> Migration's coming on the 24th. I'm now officially sweating. :)
In our experience FS-wise, ReiserFS is the worst performer between ext3,
XFS e ReiserFS (with tailBLAH turned on or off) for a Cyrus Backend (>1M
mailboxes in 3 partitions per backend, 0.5TB each partition).
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