[Dovecot] Production server migration from mbox to maildir ( need advice )

[Frank Bonnet]

Hello

I'm going to change the raid array of my mailhub in fews days/weeks and I
wonder if it would be a good idea to take the opportunity of this migration
to also change the storage method from mailbox to maildir.

I've never used maildir on my production server only on small satellites.

So I really need advice of admins that use maildir format on prod servers.

My server has approx 3500 users/mailboxes that is approx 450 Gb of data.

The OS is Debian etch amd64 but could change also during the migration
Opensuse X86_64, CAOS-NSA, FreeBSD 64 are some options.

Any infos/experiences welcome, I'll summarize answers.

Thanks a lot.