[BackupPC-users] Local rsync backup aborts randomly II

[Thomas K. <thk...@gm...>]

Hi folks,

sorry about that mail before, some additional information here ...

I have a very strange behaviour with BackupPC on a XEN VM instance with
SuSE 10.3 x86_64. BackupPC is configured to back up some local
directories with sudo rsync. The capacity of these directories is about
45 GB.

I'm using BackupPC 3.1.0, rsync 2.6.9, File::RsyncP 0.68, and the
latest CPAN modules for Archive-Zip, Compress-Zlib, Compress-Raw-Zlib,
IO-Compress-Base and IO-Compress-Zlib. My kernel is 2.6.22.18-0.2-xen
from SuSE.

No matter whether I let BackupPCd start the backup or I do it manually,
sooner or later the backup is aborted, strangely almost never at the
same time or file to backup or even with the same error message. Some
examples:

Illegal division by zero
at /usr/lib/perl5/site_perl/5.8.8/IO/Compress/Base/Common.pm line 621.
(after 17m34.737s)


Remote[1]: Invalid remainder length 50176 [sender]
Remote[1]: rsync error: protocol incompatibility (code 2) at io.c(960)
[sender=2.6.9]
(after 18m40.362s)


Use of uninitialized value in join or string
at /usr/lib/perl5/site_perl/5.8.8/IO/Compress/Base/Common.pm line 660.
Compress::Zlib::inflateInit: unknown key value(s)
at /usr/local/BackupPC/lib/BackupPC/FileZIO.pm line 154
(after 16m45.045s)


Can't call method "isCached" on an undefined value
at /usr/local/BackupPC/lib/BackupPC/Xfer/RsyncFileIO.pm line 165.
(after 69m9.780s)


This is just an excerpt, I have a few more.

The effective rsync options are: --numeric-ids --perms --owner --group
-D --links --hard-links --times --block-size=2048 --ignore-times
--recursive --one-file-system

I searched the BackupPC log files for hints about it, but I didn't find
anything useful. The disks are not full, there is enough memory left
(the VM has about 1.3 GB of RAM which are not exceeded by BackupPC as I
see from carefully looking at top :).

A physical RAM problem can be almost certainly eliminated since I moved
the VM to a different host machine, and the problem(s) persist.

The problem is reduced (thus not eliminated) when I turn down
compression to level 0 - but that's not really what I want ...

The same BackupPC installation is also backing up two Windows machines
via smb, one with about 1 GB and the other with about 18 GB of data, and
it does this just fine.


Any help about these apparently random aborts is very much
appreciated ... thank you!


Thomas