[zfs-discuss] Re: Production use ?

josh at burstyns.com josh at burstyns.com
Fri May 25 10:59:23 EDT 2012


All very true. I guess I've just been very cautious since I'm just
starting my journey with ZFS and DRBD/Heartbeat.

Perhaps I'll setup a test lab and test your advice over the weekend. :)

> On 05/25/2012 03:36 PM, josh at burstyns.com wrote:
>> We do not automate failover -- that wasn't our mandate with this
>> project.
>> (The project was designed to protect the data via DRBD at all costs.) We
>> are aware that manual intervention will be required to "failover" the
>> ZFS
>> ZVOLs and the targets.
>
> Why manual? Surely you could automate this using RHCS (or heartbeat). I
> fairly regularly deploy redundant MySQL servers that use a DRBD backed
> FS for the databases/binlogs, and the failover works quite well
> (obviously the client has to reconnect).
>
>> I spent some time trying to conceive of a way to automate a failover but
>> in the end decided that it was better to have a person attend to a
>> failure
>> in lieu of trying to come up with every possible scenario. Again, this
>> is
>> mainly due to the non-integration of DRBD, ZFS and the iSCSI daemon.
>
> You could have it automated with a cascade of dependencies in RHCS. You
> have the iscsi service dependant on zfs service, which is in turn
> dependant on DRBD being primary.
>
> Gordan
>



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