[Dovecot] Questions regarding dbox migration
mikkel at euro123.dk
Wed Oct 14 22:28:41 EEST 2009
Timo Sirainen skrev:
> On Oct 14, 2009, at 7:03 AM, Mikkel wrote:
>> Now the big question is whether multi-dbox and single-dbox are
>> compatible formats.
> Kind of, but not practically.
>> If a Maildir->dbox migration is made on a system running dovecot v.
>> 1.1, would it then be trivial later changing to multi-dbox after
>> upgrading to 2.0 or is a completely new migration then needed?
>> Would this scenario be much different if the system is upgraded to
>> version 1.2 before the change to single-dbox?
> Migrating from single-dbox to multi-dbox isn't any easier than maildir
> -> multi-dbox.
From your comments it appears like dbox and mdbox are quite different
in many ways. Is mdbox going to replace dbox completely or are you
expecting to keep both formats?
My point is: what's going to be the difference between dbox and mbox
with mdbox_rotate_size set small enough to allow only one mail per file?
> I'm trying to get v2.0.0 out pretty quickly though. v2.0.beta1 should
> hopefully be out in less than a month. The main problem with it is
> actually how to make it enough backwards compatible that everyone won't
> start hating me.
That is great news. I'm looking very much forward to make the shift to
A new mail storage format is really, really, really interesting from my
point of view. CPU and RAM are both very cheap by now but disk I/O
remains as expensive as always and really is the only limiting factor
these days and is what's driving up the costs of running any larger mail
The performance gains you mentioned previously this year would probably
cut the total datacenter costs in half and that is quite an accomplishment.
How stable do you think dbox and mdbox are at the moment?
More information about the dovecot