[Imap-uw] uninterruptible sleep, high load average, high iowait
jcohen at mak.com
Wed Oct 22 14:25:25 PDT 2008
<head down>...mostly mbox format. I know we've been pushing the outer
limits of the system for some time now, but as a testament to the
durability of the file system it has worked very well up until two weeks
ago.Nevertheless, we'll be moving off this server within days.
Mark Crispin wrote:
>> - we currently have no quotas (you read that right) on disk usage and
>> despite warnings from I.T., many users' Inboxes had grown to between 400
>> and 600MB. Sent and Trash folders for several users> 1GB. Some users
>> have as many as 300 imap folders, so while there are just 60 users,
>> we're hitting the machine pretty hard (IMO).
>> - our tech support mail account is shared by about 15 people who may
>> attach to it at one time.
> I hope that you're using mbx format and not traditional UNIX mailbox format
> (mbox format) especially as you have multiple access to the same mailbox.
> Traditional UNIX format is a disaster with that type of size. mbx format
> starts to creek around that point as well, although the issues in mbx is more
> with the number of messages than the raw mailbox size.
> In imap-2007b, you will find mix format which should scale much better to
> this type of mailbox.
> Note that I no longer support UW IMAP; I'm just responding as a community
> member. I've forked Panda IMAP -- http://panda.com/imap/ -- and am
> working on (among other things) a completely new IMAP server at
> Messaging Architects.
> -- Mark --
> Store, manage and share up to 5GB with Windows Live SkyDrive.
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