On Mon, Aug 16, 2010 at 5:15 AM, Timo Sirainen <t...@iki.fi> wrote: > On 16.8.2010, at 7.33, Bryan Vyhmeister wrote: > >> Would it work to run 'dsync mirror' every minute against either mdbox >> or sdbox mailbox on a dedicated network connection between two (or >> potentially three or four) mail servers? I'm trying to avoid using a >> NAS/SAN or some other dedicated NFS server in a simple environment >> with a limited number of users. Everything else about the systems >> could be identical. Both could receive mail using Postfix with dovecot >> LDA. Thank you. > > Were you thinking about master/slave or multi-master setup? Multi-master > might work ok with director, as long as dsyncing is done often enough.
I was thinking about multi-master. I didn't think about director but that would solve the issue of not connecting to the same server each time and would cause dsync to not have to happen quite as often. > > If you don't have many users, then maybe dsyncing once a minute is enough. A > more optimal version would go something like: > > - create a dsyncing server process > - create a Dovecot plugin (using notify plugin, similar to mail_log) that > notifies dsyncing process every time some user's mailbox changes > - based on that information, dsyncing process either runs dsync or delays it > a bit. like maybe flag changes and expunges would be delayed a bit, but new > mails would be immediately synced > - run a full dsync for every user once in a while anyway, just in case some > notifications were missed > - implement a QRESYNC-like syncing for dsync to improve performance and > reduce network traffic I'll have to investigate this further. This sounds like an even better solution. Thank you! Bryan
