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:
- DRBD is limited to two nodes
- Twice as many disks are required vs single host, NFS share, SAN LUN
- GFS2/OCFS2 metadata exchange is slow and gets slower with load
- 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