Moving mailboxes in Cyrus Murder leaves mails behind on source server

[Peter Bücker]

Hi all,

We're having an issue with our Cyrus Murder environment when moving 
mailboxes from one backend to another backend. Some mails are left 
behind on the source server while we think they should be removed. We 
issue the rename by using "cyradm" on the source server with the 
following command:

oldserver> rename user.foo user.foo newserver!default

Cyrus completes the migration without any error messages, and all mails 
are successfully copied to the new backend. However, some mails are left 
behind in the spool directory of the old backend server. According to 
<http://cyrusimap.web.cmu.edu/docs/cyrus-imapd/2.4.17/install-murder.php> section 
"Moving mailboxes between backends", seen state should be the only thing 
left behind on the source server. The mailbox database is updated 
correctly, e.g. the old backend now longer believes to own the affected 
mailboxes.

It happens to be that only complete mailboxes are left behind. For 
example, the whole INBOX might be left behind, and maybe also some 
subfolders. But if a folder is left behind, it's always completely left 
behind, not just partially.

Is this expected behavior or are we doing something wrong? Please note 
that the affected user was logged in via IMAP during the migration.

All servers are running vanilla Cyrus 2.4.17 compiled from source, 
running on Debian Squeeze or Debian Wheezy. All backend servers just 
have one partition.

The backend configuration looks like this:

------------------------------------------------------
configdirectory: /var/lib/cyrus-imapd/imap
defaultpartition: default
partition-default: /var/spool/cyrus-imapd

admins: cyrus-admin cyrus-murder
allowallsubscribe: 1
expunge_mode: delayed
delete_mode: delayed
allowanonymouslogin: no
hashimapspool: 1
duplicatesuppression: 0
sendmail: /usr/sbin/sendmail
unix_group_enable: 0
imapidresponse: 0
lmtp_downcase_rcpt: 1

sievedir: /var/lib/cyrus-imapd/sieve
sieve_maxscriptsize: 32
sieve_maxscripts: 5

sasl_mech_list: plain login
sasl_pwcheck_method: saslauthd
allowapop: 0
allowplaintext: 1

sync_log: 1
sync_authname: cyrus-admin
sync_password: xxxxx
sync_host: cyrus-replica
sync_repeat_interval: 5

mupdate_server: cyrus-mupdate
mupdate_authname: cyrus-murder
mupdate_username: cyrus-murder
mupdate_password: xxxxx
proxy_authname: cyrus-murder
proxy_password: xxxxx
proxyservers: cyrus-murder

allowusermoves: 1
disconnect_on_vanished_mailbox: 1
------------------------------------------------------

Thanks for any support :-)

Regards,
Peter