I have a ~2000 user mailcluster on a rbd blockdevice backed by ceph, it’s distributed over ~8 disks and works without any issues for more than 3 years now. Ceph is not so fast as DRBD but more flexible. I would not expect any issues with DRBD, except for the problem that logical failures (e. g. an accidental rm -rf /va/rmail) means your cluster is dead, whereas with dsync nothing is lost.

wogri

On Mar 31, 2017, at 16:15, George Dimakopoulos velicrongr@gmail.com wrote:

Is it stable for dovecot 2.2.27 to implement DRBD (or HAST) on block level for maildir data replication instead of using dsync plugin?

Regards,

George