Henrique de Moraes Holschuh schrieb: > > On Tue, 07 Jan 2003, Simon Matter wrote: > > I'm currently planning a new mailsystem so I'm interested in quick > > recovery in case something goes wrong. > > Quick recovery means you need to shutdown the mail system, LVM-snapshot the > volume and restart it (if your system is well configured, this is quite > fast, and can be done at 04:00 in the morning ;-)). > > Then, copy the LVM snapshot somewhere safe, and unfreeze it. > > There are other ways, of course, but you asked for the quickest recovery > possible... > > > My idea was the following: > > - Using XFS or ext3 filesystem (XFS is the preferred one) > > - Using LVM > > You'll need both, unless XFS can snapshot by itself. It is much faster than > ext3, btw. I'm using it for postfix spools, and will try it in Cyrus spools > one of these rainy days.
I have several servers, including Cyrus, running on XFS. It's really cool to grow mounted filesystems on LVM while the server is running. > > > - Having two servers. One real server and a 'snapshot' server. > > The snapshot server is built with cheap, big IDE drives. Using rsync, > > snapshots (well, sort of) are taken periodically and in the case of > > failure, data can be restored quickly from this box. > > That won't work quite perfectly, but it could work well. The mail messages > themselves are very rsyncable :-p but if you want to make sure you won't > lose state, you will need to have plaintext backups of the mailboxes db, and > that the user is not using the mailbox when you copy it (due to the seen > db). I don't know a better solution without having to stop the server. > > Still, it is what I would use myself, and there is a reason why the Cyrus > debian packages take a silent plaintext snapshot of the mailbox db to the > /var/backup directoriy every night by default :-P I'll add something like that to the next cyrus rpm release. Simon > > -- > "One disk to rule them all, One disk to find them. One disk to bring > them all and in the darkness grind them. In the Land of Redmond > where the shadows lie." -- The Silicon Valley Tarot > Henrique Holschuh -- Simon Matter Tel: +41 61 695 57 35 Fr.Sauter AG / CIT Fax: +41 61 695 53 30 Im Surinam 55 CH-4016 Basel [mailto:[EMAIL PROTECTED]]
