Gerard,
Gerard Ceraso wrote:
I have a server setup using Cyrus 2.1 and postfix, with mysql. What II'm not sure about the perfect mechanism to achieve this. I think the best workable solution at this moment is to have a disk array with 2 SCSI interfaces, and connect it to 2 machines. You can't mount a volume on both machines read-writeable, so it is impossible to connect to "either one". But at least you have a "hot spare" in case something happends with the OS or hardware of the first machine, and it is likely that your cyrus databases are still ok.
would like to have is 2 servers basically the second would be a
replication of the first server. So I would like to be able to connect
to either at any given time and get my mail and the mail being the same
on both mainly for the reason if one was down. Anyone have a suggestion
how I could accomplish this?
I once just synchronised the cyrus spool directory with something like unison, and that was not really the best solution. This bi-directional synchronisation works for plain files, but with the database files this causes more pain. I assume this works as soon as you reconstruct your mailboxes on the failover machine at a crash: at least you have all the data "stand by" on another machine.
It would be a bit better if there was something like offlineimap that could synchronise a complete spool. With offlineimap you can synchronise between two IMAP servers on user-basis. Maybe if offlineimap is modified, or if you setup a configuration for each user, you can achieve a situation with two identical mail-servers (where you can actually use both at the same time).
I hope this kind of functionality comes into cyrus once; I assume it is not there yet, I once asked this on the list before ;-) And maybe it shouldn't be too difficult, since there is already a synchronisation mechanism for NNTP in place, if I'm correct.
Regards, Paul
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