[Dovecot] Redundant shared mail store?

Hi guys

I'm about to embark on a project replacing a legacy single mail server running proprietary software with a cluster of Dovecot servers. We clearly need a shared mail store for these servers, but we are not happy with simply using a server running NFS as this becomes a single point of failure.

What have other people used? AFAICT our options are:

* A shared block device (Fibre Channel, iSCSI, ATAoE etc) running GFS

or similar to allow multiple servers to access it concurrently

* Two or more NFS units, either with built-in support for replication

of FS changes and failover, or with scripts for achieving this functionality

I prefer option 1, although it's expensive. What have other people used? Do we have other options?

TIA

Jasper Bryant-Greene Director Album Limited

jasper@albumltd.co.nz +64 21 708 334 / 0800 425 286 http://www.albumltd.co.nz/