On 10/13/2016 11:38 PM, Thing wrote:
Hi,
I am just finishing building the Gluster cluster on 3 x Dell 990s
running centos7 Gluster 3.8.4. The bacula server will be a 4th Dell
990 with a 5TB USB3 disk out the back. It has no OS on it yet but as
I'd like to run FreeIPA 4.0 on it my preference would be Centos 7 but
I can virtualise that function instead if Debian or Ubuntu would be
better for Bacula.
ie the ultimate reason for the gluster cluster is to back 3x VM hosts,
I dont have that hardware yet though.
I use a simpler setup. VMs run on a pacemaker/corosync cluster and use
native filesystems on DRBD disks in active/passive mode. It is kept
simple on purpose, as a VM restart in the event of a node failure is
"good enough" availability for my purposes and active/passive mode
alleviates much of the split-brain worries. That said, I have found that
it is preferable to install bacula-fd on the VMs themselves and backup
the VMs, rather than backing up the disk images on the host. This allows
restoring an accidentally deleted/corrupted file directly to the VM
without having to restore an entire disk image. This does require more
resources for the Bacula catalog db, but is far more useful. I have had
to restore a few files several times, whereas I have never (thankfully)
had a catastrophic loss requiring a full disaster recovery.
On 14 October 2016 at 00:54, Josh Fisher <jfis...@pvct.com
<mailto:jfis...@pvct.com>> wrote:
On 10/12/2016 11:15 PM, Thing wrote:
> Hi,
>
> Has anyone done this? I have a small 3 node 1TB gluster setup I'd
> like to make up to an external USB3 disk using bacula so I can take
> the disk offsite. What I dont want to do however is impact the
> gluster performance if I can so I am wondering how best to get the
> data off and onto the external USB3 disk.
>
> Can I do this directly? ie have a fd on one gluster node? it seems
> awfully hard to find anyone how has done this and if there would be
> problems.
Yes. You can mount the gluster on the host running bacula-sd,
(where the
USB3 drive is attached), and backup directly.
>
> Or alternatively, I am wondering maybe stream the data off
gluster to
> a "new' disk in the bacula server via nfs with rsync and then have
> bacula back that "new" disk up to the external USB3 disk?
Either way, the entire gluster, of necessity, must be read, so
performance will be impacted. The pre-copy is not necessary.
Bacula has
built-in spooling to disk that can be enabled. The spooling
essentially
does the same stream-to-disk, but via Bacula's client-server
socket i/o,
rather than NFS. Whether or not spooling would be helpful is hard to
say. It depends on many things, including network throughput, USB3
drive
sequential write performance, etc.
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