[Dovecot] Questions regarding dbox migration

[Timo Sirainen]

On Thu, 2009-10-15 at 10:55 +0200, Mikkel wrote:
> > In any case if there are expunged messages, files containing them would
> > be recreated (nightly or something). That'll unfragment the files.
> > 
> 
> It would be nice if this recreation interval (nightly, weekly, monthly?) 
> was made tunable.

It's actually left up to sysadmin to run "doveadm purge -a" from
cronjob.

> Some users would have mailboxes a several hundred megabytes and having 
> to recreate thousands of these every night because of a single mail 
> getting expunged a day could result in a huge performance hit.

It doesn't matter what the user's full mailbox size is. It matters how
many of these max. ~2 MB dbox files have expunged messages. Typically
users would expunge only new mails, so typically there would be only a
single file that needs to be recreated.

> The errors I get are like these two:
> 
> dovecot: Oct 01 15:13:05 Error: POP3(account at domain): Transaction log 
> file /local/account_homedir/Maildir/dovecot.index.log: marked corrupted

This alone isn't an error, just says that error happened earlier.

> dovecot: Oct 01 15:13:57 Error: IMAP(another_account at domain): Corrupted 
> transaction log file /local/another_homedir/Maildir/dovecot.index.log 
> seq 229: duplicate transaction log sequence (229) (sync_offset=32860)

Hmm. This means that Dovecot thought that dovecot.index.log file was
rotated, but when it reopened it it actually had the same sequence
number in the header. What NFS server are you using? One possible reason
for this is if file's inode number suddenly changes.
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