On 9/16/2013 8:24 AM, Simon Fraser wrote: > > Time marches on, and I need to continue the service migration. I'd still > like to use Dovecot (we're migrating away from Cyrus). I'm assuming the > only other alternative without existing shared storage is to use DRBD > and a cluster file system to provide the replication, and to ensure > Director is enabled. Are there any things to watch for surrounding > this?
Just the basics: 1. DRBD is limited to two nodes 2. Twice as many disks are required vs single host, NFS share, SAN LUN 3. GFS2/OCFS2 metadata exchange is slow and gets slower with load 4. maildir doesn't scale well due to metadata modification rate DRBD may or may not be your best solution. I didn't read the previous incarnation of this thread as the subject lacked keywords in my area of interest/expertise. This subject one has both cluster and filesystem. If you'd like to further discuss storage options for your Dovecot workload I'd be glad to. Knowing your current/future mailbox count, avg mail and mailbox size, msgs/day, etc, is required for proper analysis. -- Stan
