James Harper wrote: >> Hi, >> >> I want to configure Director & Storage daemon of Bacula System 3.0.0 on two >> >> different nodes (same Linux flavor, CentOS 5.2 to be precise). > Performance should be the same. I do it on a Xen system where the sd is > on Dom0 for performance reasons, but the director and the catalog is on > a DomU for better flexibility (eg snapshot to test an upgrade etc). > > Just curious. What performance problems keep you from running SD in a domU? I have been experimenting with running SD in a PV domU, but haven't decided if it makes sense. Not for performance reasons, but because I have the daemons on a 2-node cluster using heartbeat for failover. For Dir it works great. For SD, there are issues. SD auto fails over and maintains the same IP, etc. The primary issue is that failover still causes a running backup job to fail because the SD-FD TCP session is broken and the daemons don't attempt to reconnect. Also, after failing because the TCP session is broken, there is no way currently to re-run failed jobs. I expect future versions of Bacula will address those two issues, and Xen 3.4 brings virtual SCSI and SATA devices to domUs. It will be very convenient to run SD in a domU, even given the problem that the backup device(s) can only be attached to one dom0 at a time and may have to be manually moved.
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