LARGE single-system Cyrus installs?
vbfox at ucdavis.edu
Fri Nov 9 12:40:25 EST 2007
Eric Luyten wrote:
> Another thought : if your original problem is related to a locking issue
> of shared resources, visible upon imapd process termination, the rate of
> writing new messages to the spool does not need to be a directly contri-
> buting factor.
> Were you experiencing the load problem while (briefly) halting deliveries
> to the mail spool ?
Yep we tried stopping mail delivery.
If there's something that 3 admins could do to alleviate load we did it.
The bigger problem I am seeing is that Cyrus doesn't in our
usage seem to ramp load smoothly or even predictably. It goes
fine up to a certain point, and then you hit a brick wall without
very much in the way of warning. You add that small chunk of
extra users or load and suddenly everything goes to hell. Keeping
the user-count per instance appropriate was the only thing we did
over multiple days of desperate "try this" that did the job.
A generous engineering cushion of capacity seems more critical than usual.
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