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

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