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Date:      Sat, 23 Nov 2002 18:43:10 -0600
From:      Drew Raines <drew-public@poured.net>
To:        freebsd-chat@freebsd.org
Subject:   mail queues on softdep (was Re: Sharing calendars?)
Message-ID:  <l6vn0nzvlup.fsf_-_@williams.mc.vanderbilt.edu>
In-Reply-To: <3DE00781.F47E59A1@mindspring.com> (Terry Lambert's message of "Sat, 23 Nov 2002 14:56:01 -0800")
References:  <GEEGJMKEOCMNOBOAHIOMMENACBAA.pcable@slaudiovis.org> <a05200f1bba044cddeec9@[192.168.0.3]> <l6vzns0uvol.fsf@williams.mc.vanderbilt.edu> <3DE00781.F47E59A1@mindspring.com>

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Terry Lambert <tlambert2@mindspring.com> writes:

> Drew Raines wrote:
>> Brad Knowles <brad.knowles@skynet.be> writes:
>> > At the very least, if you do decide to continue with qmail,
>> > make sure you turn off softupdates for that filesystem.
>> 
>> By ``that'' filesystem, he means /var/qmail/queue.  You can keep
>> everything else on a vanilla FFS partition.  It's the same
>> recommendation for any mail queue whose contents you care about.
>
> Why are soft updates bad for mail queues, in your opinions?

My opinions aren't authoritative because I've never (knowingly)
experienced it, but apparently a message could be lost if it's
accepted by the MTA and there's a system failure before the
metadata gets written to the disk.

This could happen with sync, too, I guess, but the latency is
increased with soft updates.  There might be characteristics of
qmail's queue which causes it to be more susceptible than others,
but the logic seems to apply to all.

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