dovecot - May 2021 - Dovecot v2.3.13 reporting (very) incorrect vsize for some maildir folders

On 20. May 2021, at 13.08, Eirik Rye <rye at trojka.no>
wrote:
> 
> 
> 
>> On 20 May 2021, at 12:31, Aki Tuomi <aki.tuomi at
open-xchange.com> wrote:
>> 
>> Hi!
>> 
>> Quota will count only virtual size of mails (and not directories) and
that will likely never match with du -bs, which counts for things more than just
the mail contents.
> 
> Right, but the quota/vsize of the folder in my example is calculated by
Dovecot to be ~14GB, while the real physical size of the whole directory is
~6.8GB. Dovecot thinks the folder is twice as big than it actually, physically
is. :/
You can also look at the folder-level vsizes to see which one is causing the
differences (or are they all doubled?)

doveadm mailbox status -u user vsize '*'

> On 20 May 2021, at 13:44, Timo Sirainen <timo at sirainen.com> wrote:
> 
> You can also look at the folder-level vsizes to see which one is causing
the differences (or are they all doubled?)
In this user's case, it is only the Trash-folder that has the wrong vsize
calculation:

# doveadm mailbox status -u <username> 'messages vsize'
'*'
Drafts messages=0 vsize=0
Sent messages=0 vsize=0
Trash messages=14870 vsize=14584428026
Spam messages=3 vsize=227701
INBOX messages=1866 vsize=1640766021

The other mailboxes (INBOX and Spam) are both within what I consider reasonable
in terms of differences in virtual/physical sizes:

# du -bs /mail/<username>/Maildir/cur
1603071610      /mail/<username>/Maildir/cur
# du -bs /mail/<username>/Maildir/.Spam
241489  /mail/<username>/Maildir/.Spam

But the Trash mailbox is physically HALF the size of what Dovecot reports:

# du -bs /mail/<username>/Maildir/.Trash
7200481589      /mail/<username>/Maildir/.Trash

The message count reported by dovecot (14870) is correct, however:

# ls /mail/<username>/Maildir/.Trash/cur | wc -l
14870

With the other users I have noticed the same issue, it's a different mailbox
and not Trash.

One user has a mailbox reported by Dovecot as being ~13.7GB while it is actually
physically only around 0.3GB. For this user I haven't tried stripping W=
sizes or deleting dovecot control files, though.

- Eirik