[Dovecot] Dovecot mailstorage migration uppon logging / delivery with dsync

[Xavier Beaudouin]

Hi there,

I have a pretty standard setup with "simple" dovecot 2,0 configuration 
(eg /var/mailboxes on NFS with old netapp) and local ldap directory and 
Maildir.

I wanted to find a good way to migrate from NFS old netapp to NFS new 
server (this one is not a netapp !).

There 3 kind way (according to my own experience)

- rsync old spool to new spool being patient stop services and then 
doing last rsync and mount /var/mailboxes mount point from old netapp to 
new nfs server).
- doing imap_login (and other stuff like this) doing an rsync per box 
AFTER doing the first rsync with all boxes...
- using dsync to fetch the maildir stuff from old server to new one, 
doing a simple flag, and doing "au fil de l'eau" migration.

The last one seems to me a good idea, but I cannot figure host to make 
this correctly.

Any hints or do someone here has already done this kind of stuff?

Kind regards,

-- 
Xavier Beaudouin