On 05/02/13 02:06, Timo Sirainen wrote:
On Tue, 2013-01-29 at 19:58 +0000, Rob Redpath wrote:
I'm encountering two, probably related, errors in my Dovecot 2.1.10
install. The issue relates to compressed email stored in Maildir format
directories.
In some cases, a mailbox will become inaccessible, and the following
will be logged from a doveadm fetch:-
doveadm(i...@example.com): Error: Corrupted index cache file
/var/spool/virtual_mail/info_example.com_d/dovecot.index.cache: Broken
physical size for mail UID 2777
doveadm(i...@example.com): Error: Cached message size smaller than
expected (18996 < 64624)
doveadm(i...@example.com): Error: Maildir filename has wrong S value,
renamed the file from
/var/spool/virtual_mail/info_example.com_d/cur/1277451630.H877760P14612.mailserver.example.com,S=18996:2,Z
to
/var/spool/virtual_mail/info_example.com_d/cur/1277451630.H877760P14612.mailserver.example.com,S=18996:2,Z
Interestingly, the file mentioned in the error (
/var/spool/virtual_mail/info_example.com_d/dovecot.index.cache ) doesn't
exist.
The uncompressed size of the file is 64624 bytes, the compressed size is
18996.
Dovecot's zlib plugin requires that the maildir filenames
have ,S=uncompressed size. Otherwise you get those errors.
http://dovecot.org/tools/maildir-size-check.sh can be used to fix the
filenames.
Thanks for this. The problem I'm encountering is that Dovecot renames
files, and does so to their size on disk rather than their uncompressed
size, undoing any corrective action that's been taken. For example:-
[root@mailserver ~]# ls
/var/spool/virtual_mail/info_example.com_d/cur/1287153356.H188882P6490.mailserver.example.net,S=4580:2,SZ
/var/spool/virtual_mail/info_example.com_d/cur/1287153356.H188882P6490.mailserver.example.net,S=4580:2,SZ
[root@mailserver ~]# zcat
/var/spool/virtual_mail/info_example.com_d/cur/1287153356.H188882P6490.mailserver.example.net,S=4580:2,SZ
| wc
345 1530 24587
[root@mailserver ~]# mv
/var/spool/virtual_mail/info_example.com_d/cur/1287153356.H188882P6490.mailserver.example.net,S=4580:2,SZ
/var/spool/virtual_mail/info_example.com_d/cur/1287153356.H188882P6490.mailserver.example.net,S=24587:2,SZ
[root@mailserver ~]# doveadm fetch -u "i...@example.com" text all >
/dev/null
<snip>
doveadm(i...@example.com): Error: Maildir filename has wrong S value,
renamed the file from
/var/spool/virtual_mail/info_example.com_d/cur/1287153356.H188882P6490.mailserver.example.net,S=24587:2,SZ
to
/var/spool/virtual_mail/info_example.com_d/cur/1287153356.H188882P6490.mailserver.example.net,S=4580:2,SZ
</snip>
