Michael wrote: > short version: Is there any 3 host (two MX and one frontend IMAP) that > can use a shared (iSCSI) ext4 volume?
No. iSCSI exports a block device from one host to another single host. > Long version: > I am running a very complex setup right now with two MX, two > proxies(lmtp/imap)/imap-frontends and two backends mounting an > ocfs2 volume. > > I would like to reduce the complexity (and the number of hosts) and > get rid of ocfs2. I ask myself if I can use an ext4 iSCSI-LUN using > this setup: > > MX01 -> lmtp:unix:private/dovecot-lmtp -> mail_home: /var/mail > MX02 -> lmtp:unix:private/dovecot-lmtp -> mail_home: /var/mail > IMAP01 (imap) -> mail_home: /var/mail You cannot mount an iSCSI device simultaneously from different hosts without using any locking/cluster filesystems. Otherwise you would risk corrupting your ext4 filesystem. Use NFSv4, DRBD or any other clustering mechanisms to provide high availability while preserving data integrity. Regards Daniel -- https://plus.google.com/103021802792276734820
