ctl_cyrusdb I/O requirements

[Anthony Tibbs]

Hi everyone,

I'm running Cyrus 2.3.14 on a VPS (Gentoo), and have been for a number 
of years now.  All was well until last night when performance went down 
the tubes and I started seeing high I/O wait times.  I'm pretty sure 
this is a problem on the hosting end, but in trying to diagnose the 
source of the I/O congestion, the closest I could come to answer was 
that ctl_cyrusdb is reading/writing about 15-20 4096b blocks (from the 
/var/imap/db/* files) per second.    This amounts to read/write 
throughput in the 250kb/second range. 

Is this "normal" behaviour?  I never noticed before, but it's the only 
thing I see that is constantly generating I/O...

Take care,
Anthony

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