On 9/26/2012 11:13 AM, shockwavecs wrote:
> We have two NAS boxes that sync all data over DRBD. When NAS1 goes down I 
> want NAS2 to automatically become the system to backup to tape.
>
> If NAS1 is up, then backup NAS1, else NAS2 becomes backup source for NAS1.
>
> Is this possible? Any reason not to? DRBD is in master-slave config so data 
> <i>should</i> never be served from two places at once.

This is beyond the scope of Bacula. Basically, use Corosync/Pacemaker 
(see http://www.clusterlabs.org/) to setup NAS as a high availability 
cluster service with NAS1 and NAS2 as the cluster nodes. The DRBD 
storage, bacula-fd, and a virtual IP address will be under cluster 
control, meaning all will run on only one server at a time and the IP is 
only assigned to one server at a time.  Alternatively, setup a single 
virtual machine on the DRBD storage that also runs bacula-fd, then use 
Corosync/Pacemaker to run the VM on only one node at a time. Either way, 
it just looks like a single NAS box with a single IP address to Bacula 
and doesn't require anything fancy from Bacula.


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