On 03/13/2014 12:21 PM, Markus wrote:
> Hi list,
>
> I think I found a bug with the pc/backups "state" files, or with file
> locking or something like that, not sure what the correct terminology
> is. I'm running BackupPC-3.2.1-7.el6.x86_64 on CentOS release 6.2
> (Final) 64bit.
>
> Here's what happened:
>
> 1. Every now and then, like every 4 or 5 months, my backup server
> crashes, out of memory (not enough RAM) or something like that. When
> it's not responding anymore, like it was the case today, when no login
> on the console is possible anymore and CTRL+ALT+DEL won't work, I have
> to hard reboot it.
>
> 2. My storage is on a QNAP NAS via iSCSI and it's mounted as
> /var/lib/BackupPC. When the server comes back online after a reboot,
> everything is fine, all the files are there... almost... because pretty
> much the most important files when it comes to BackupPC are *sometimes*
> zeroed, namely the pc/backuppc files in each hosts' directory
> (/var/lib/BackupPC/pc/hostname/backups).
>
> 3. So in this particular case, after the reboot, BackupPC reported under
> Host Summary: 6 hosts that have been backed up, 21 hosts with no
> backups. Wait... it should say 27 hosts have been backed up. So I had a
> look at the pc/ directories for all the hosts and the 'backups' file had
> 0 bytes for those 21 hosts.
>
> 4. Fortunately, for most hosts, a backups.old file existed which was
> just a few hours older than the backups file, so I copied backups.old to
> backups for each host and the backups for 23 hosts now show up again in
> the web frontend. Not sure about any inconsistencies but I'm guessing it
> doesn't matter or it will figure it out by itself. :)
>
> 5. Except for 4 hosts where the backups.old file was also 0 bytes. So
> these backups are lost, although the actual backed up data is still
> there of course, but I won't bother with recreating the 'backups' file
> by hand or something like that, it's not that important, and in 1-2 days
> I'll have a good, useable backup again. It will just start from scratch
> for those 4 hosts.
>
> 6. I "lost" these 4 hosts because I'm not backing up the 'backups'
> files. :P Well, this is the second time now this has happened. I would
> say it happens in about 33% of the cases where I have to hard reboot the
> server. Please note: all other files are there! Just the 'backups' state
> files are 0 bytes, well, for most hosts.
>
> 7. My mount options are (mount -v output): /dev/mapper/data-rz--nas01 on
> /var/lib/BackupPC type xfs (rw,_netdev)
>
> I'm speculating BackupPC needs a better "locking" feature of some sorts?
> Or another mechanism that this can't happen again. Or maybe I need to
> upgrade to the latest version?
>
> Thank you!
> Markus
>
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>
You might have hit this "bug"
https://bugzilla.redhat.com/show_bug.cgi?id=845233
------------------------------------------------------------------------------
Learn Graph Databases - Download FREE O'Reilly Book
"Graph Databases" is the definitive new guide to graph databases and their
applications. Written by three acclaimed leaders in the field,
this first edition is now available. Download your free book today!
http://p.sf.net/sfu/13534_NeoTech
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