Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
nick wrote: > I've got two identical machines (pentium 4, 2 80 gb SATA drives, 512mb > ram, drbd 0.7.10, CentOS 3.3, although with the ultramonkey kernel for > the heartbeat integration) which will be running as HA mailservers, with > two DRBD drives drbd0 which will contain /var and drbd1 which will > contain /home. The idea behind my setup is to make sure that no mail > gets lost either from the spool or the home users drives in case of a > system failure. I don't know, what you have in /var, but usually there will be e.g. /var/log/syslog which is not a good idea to mirror. If you only want to mirror your mails, mirroring /var/mail should be enough. > The drbd drives will be running on top of two Raid partitions /dev/md2 > and /dev/md3, I've created two 150mb partitions for the meta data, > /dev/sda7 and /dev/sdb7. > The thing is, I already have data and a filesystem present on md2 and 3, > ext3 to be exact, and most of the replies I've seen on this subject seem > to be aplicable to people with internal metadata, in that they advise > shrinking the filesystem first (I'm assuming here, correct me if I'm > wrong). If you have metadata external you need not shrink the filesystem. > Before I take the leap in changing my fstab, and mounting the drbd > drives, what exactly do I need to know, then do? I'd prefer not to lose > any data (although it wouldn't be the end of the world), and I'm not > sure exactly what effect creating a filesystem would have on the > existing data. I'd be glad to read up on it, if anyone has any pertinent > links. If you 'create' a filesystem, i.e. doing 'mk2fs', on a partition with existing data, you will get an empty filesystem anyways. > Also, I could use some more information on heartbeat integration, most > of the ones I've seen list datadisk, but in my /etc/ha.d/resource.d/ > there's a drbddisk, is this the same thing? Since DRBD 0.7.x drbddisk is used. > Does anyone have any links > or info I can read which deal witht he latest versions of DRBD and > heartbeat? For e.g. a ha-mailserver you will usually need to configure drbd, IP-failover, and the failover of the mailserver-demon. You should read http://wiki.linux-ha.org/FrontPage and linked documents carefully. Helmut Wollmersdorfer