[OpenAFS] maildir on openafs
Tue, 8 Apr 2008 10:46:09 -0700
On Apr 8, 2008, at 9:49 AM, Russ Allbery wrote:
> "David Bear" <David.Bear@asu.edu> writes:
>> I seem to distantly recall some discussion about storing maildir
>> directories on openafs, but I don't remember if it was safe,
>> discouraged, or otherwise problematic. Any one see problems with
>> maildir in afs?
> The maildir protocol requires cross-directory hardlinks. In order
> to use
> it in AFS, you have to modify the protocol slightly in a way that may
> undermine some of its reliability guarantees (although *probably* not
Changing the operation that uses to a rename() is actually fine.
The problem with maildir is that many of the IMAP-maildir drivers use
stat() information to store the message's IMAP UUID, and stat() is a
rather expensive operation in AFS.
In my case, I had written a c-client driver which stored the UUID in
the filename of the maildir message, which got around this -- and
there's also an issue regarding UUID generation which is best
implemented with a lock that to guarantee correct generation.
Its a mess. AFS is not for mail. Unix "user accounts" are not for
mail. Use an actual mail system and do it right ;)