OT - Scalable email server solution needed

Bill Moran wmoran at collaborativefusion.com
Sun Apr 9 23:06:43 UTC 2006

"Marc G. Fournier" <scrappy at hub.org> wrote:

> On Sun, 9 Apr 2006, Bill Moran wrote:


> > I have only a small amount of experience with Cyrus.  However:
> > http://cyrusimap.web.cmu.edu/twiki/bin/view/Cyrus/Backup
> >
> > Based on that document, it appears as if you're dodging the bullet with
> > backups.  My interpretation is that Cyrus keeps mailboxes in some sort
> > of db file.  If a db file is being modified while you're backing it up,
> > the backed up version will be inconsistent, thus the entire mailbox
> > unusable.
> Agreed, but this db file is stored within the maibox itself, and which is 
> what Cyrus has a 'reconstruct' command to rebuild ... so, after a restore, 
> the first thing you run in 'reconstruct' to make sure you database(s) 
> match the mailbox ...
> > Compare this to Maildir, where each message is a seperate file.  If 
> > you're backing up during access to a mailbox, a single message could end 
> > up corrupt, but this will not affect the rest of the mailbox.
> Oh, wait, I misunderstood your first paragraph ... Cyrus IMAP stores its 
> individual mail messages in a seperate file (old 'mh' kinda thing), but 
> there is a db file that maintains the 'state' informatin for the folder 
> (what messages have been read, marked deleted but not purged, etc) ...

Hmm ... I apologize for the misinformation then.  It seems like the link
listed above could use some updating.

Bill Moran
Potential Technologies

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