From: Andre Nathan (no email)
Date: Fri Mar 02 2007 - 19:46:13 EST
On Fri, 2007-03-02 at 12:59 -0800, Andrew Morgan wrote:
> You'll lose the ability to effectively use vacation/out-of-office
> messages. The vacation system uses deliver.db to determine which person
> has already received the vacation message, to prevent multiple messages
> from being sent.
But does vacation depend on the duplicate_{check,mark} calls from lmtpd?
I didn't read the sieve code, but imap/lmtp_sieve.c also calls those
functions.
> From the earlier discussion on this topic, it sounds to me like you are
> simply pushing your available hardware too hard without further tuning.
> You mentioned using ATA-over-Ethernet storage for your mail spool. Have
> you considered putting your configdirectory files on a local hard drive
> instead of on the ATA-over-Ethernet storage? There is a *lot* of
> contention for the files in the config directory, so maybe it would be
> better to move them onto a drive separate from the mail spool.
The machine actually doesn't have any local disks (it's booted via pxe
and the root partition is also on AoE). The directories /var/spool/imap
and /var/lib/imap are each on its own LVM logical volume.
I mounted /var/lib/imap/proc as a memory-based filesystem (using tmpfs),
because of the contant writes to this directory, and yesterday I tried
moving deliver.db to that directory, and creating a symlink, but it
didn't improve the situation a lot.
> After running iostat on my cyrus partition (both config and mail spool are
> kept on a SAN), I'm wondering if I should separate them out as well. This
> sounds related to the new metapartition and metapartition_files options
> that were added in v2.3.x.
>
> Does anyone have any recommendations or guidance on this topic?
Yes, people, please share :)
Thanks for the suggestions,
Andre
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