Dear Kevin, Yes, we ran UW impa for some time with drbd doing replication and it was very successful. Of course UW imap doesn't have any databases so I don't know whether that would cause a problem with drbd. I guess the worst case would be a reconstruct perhaps but even that would be much better than losing the contents of a server. We has used drbd in various places and it is very good.
Best wishes... Colin On Fri, 21 May 2004, Kevin P. Fleming wrote: > Colin Bruce wrote: > > > I haven't tried it yet but it may be that DRBD (http://www.drbd.org) > > might be able to do what you want. We used it with a UW Imap server and I > > don't see why it shouldn't work with Cyrus. It is probably possible to > > split the users between two cyrus servers and have each group replicated > > to the other server so that each server could become a server with all > > users reasonably quickly. I suspect it would take a few minutes to fail > > over. As I say I haven't tried this so perhaps it won't work. > > drbd in combination with "heartbeat" and a journalling filesystem can do > exactly this. You can have Cyrus IMAP running on both servers (different > users), with the Cyrus storage areas mirrored to the other server via > drbd. When heartbeat notices that one of the servers has died, it can > mount the other server's storage area (since it has a copy) and start up > Cyrus (and take over the other server's IP address as well, of course). > > Users would notice a service disruption, but it's not likely any mail > would be lost and they would only have to reconnect. If their mail > client is set to only connect/check their mailboxes every few minutes, > they may not notice the switchover at all :-) > --- > Cyrus Home Page: http://asg.web.cmu.edu/cyrus > Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu > List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html > --- Cyrus Home Page: http://asg.web.cmu.edu/cyrus Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html