On Wed, Jun 9, 2010 at 7:40 AM, Maurice Volaski <maurice.vola...@einstein.yu.edu> wrote: >> For Linux, I've been able to achieve what I want with DRBD but I'm >> hoping I can find a similar solution on Solaris so that I can leverage >> ZFS. It seems that solution is Sun Availability Suite (AVS)? > > AVS is like DRBD, but only to a point. If the drives on your primary fail, > the primary will start reading from the drives on the secondary. > > However, a critical difference is that after the primary fails and the > secondary takes over, you won't have a mirror until you bring the primary > completely back online as the primary. You can't make it the secondary > temporarily. DRBD can trivially reverse the roles on the fly, so you can run > the secondary as a primary and primary as the secondary and the mirroring > works in reverse automatically.
Are you sure of that? This directly contradicts what David Magda said yesterday. >> One of the major concerns I have is what happens when the primary >> storage server fails. Will the secondary take over automatically >> (using some sort of heartbeat mechanism)? Once the secondary node >> takes over, can it fail-back to the primary node once the primary node >> is back? > > When the server fails, your users would lose access because AVS deals only > with storage. It has no "heartbeat" functionality for the server itself. > This is similar to DRBD. Ordinarily, you run DRBD and Linux-HA (Heartbeat). > Unfortunately, there are no simple, easy to implement heartbeat mechanisms > for Solaris. Not so. Sun/Solaris Cluster is (fairly) simple and (relatively) easy to implement and it will handle all of the requirements that Moazam has laid out so far: intelligent failover and failback of common storage between two redundant nodes. In addition, with HA-NFS, you shouldn't have any problems with the clients - in the event of a node failure, they will pause for the few seconds it takes for HA-NFS to failover. fpsm _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
