Oh.. I envy you. Will probably need to do the same at some point, but I'm having problems understanding how we will ever be able to make the transition. Too many files -- too many users..
We did the transiction via imapsync: we had /"the old server"/ and a /"new server"/, and we migrated all mailboxes with imapsync and master user feature. The first imapsync takes a lot of time, but the next ones are incremental, and take much less time. When we are ready (a night) , we stop we switch from "old server" to "new server". Minimal downtine, and if everythings goes wrong, we can imapsync "in the other way", from new-> old instead old->new
Our mail servers are virtualized in a vmware vsphere cluster. We have HA & DRS, and all the info is stored in the iSCSI SAN. Ir our setup we "only" have a virtualized mail , but if the hw node fails the virtualized starts automatically in another ESX.
Regards
JavierHow long did it take to convert from maildir to mdbox, how much downtime ?
Do you have a clustered setup, or single node? I'm wondering how safe mdbox will be on a clusterfs (GPFS), as we've had a bit of trouble with the index-files when they're accessed from multiple nodes at the same time (but that was with v1.0.15 -- so we should maybe trust that such problems has since been fixed :-)
-jf