On Wed, 18 Jun 2008 22:24:14 +0100, Brian Candler <[EMAIL PROTECTED]> wrote: > On Tue, Jun 17, 2008 at 10:50:31PM +0200, [EMAIL PROTECTED] wrote: >> I manage an imap server (postfix, courier-imap), I would like to have >> an offsite real-time mirror. > > Summary: it's really very hard. If you can drop either the offsite or the > real-time requirement, it gets considerably more practical. > > You could do it at filesystem block level, e.g. with drbd (www.drbd.org), > but you'll need LOTS of bandwidth, and also need to run it over a VPN for > security. > > You can buy two Netapps (www.netapp.com) and use snap-mirroring. > Expensive. > > You can run your own ZFS-based filer (Solaris? FreeBSD 7?) and use its > similar snapshot copying feature. Kit of parts. > > If it doesn't have to be quite "real time" then you could look at things > like imapsync, which connect to both servers using IMAP and sync the > contents at the IMAP protocol level. That might also give you live-live > service with two-way mirroring. > > If it's only occasional one-way backup, rsync might be sufficient. > > Warning: I haven't tried any of these solutions in a large-scale WAN (i.e. > offsite mirror) environment. > > B. Hi, I had concluded more or less the same thing. rsync is not suitable for our needs. The easiest way seems to be imapsync, it didn't have to be exact real-time, normally no one will connect at the same time from in site and off site... Don't you think it could be very heavy for about 500 mail boxes, as it seems to have to connect to each mailbox to sync it. Thanks for your help
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