Nils,
When i built my first backuppc box, i only had 256 MB of ram on
hand. I wanted 512+ but sometimes you have to do with what you
got. It was always my intention to buy more memory, but as time
passed I was quite impressed with the performance on such a low power
box. All my backups ran fine and always completed between the hours
of 6pm and 6am. Even as the number of clients grew, and the size of
the backups grew, this machine was keeping up and doing well.
Finally i came to the realization that i really did not need to buy
the extra memory.
Dont get me wrong, i did see a some amount of swap activity on the
older box with 256MB, but it is NOTHING compared to what i am seeing
now.
Both boxes are custom configured to run a stripped down version of
debian. Trimming out all the fat possible. Only services i run on
the box are SSH, Munin, and Backupc.
Another thing to note, on the 2.x config i was able to run 2+
simultaneous backup commands. On the new box i can only run a
single backuppc job, otherwise it crashes backuppc w/ an out of
memory kernel panic.
What i would really like to know from people running 3.x, what is
your base ram, and what is your swap configured at. ? Are there any
users running 3.x on a machine w/ less than 512?
-N
Nicholas Mistry
[EMAIL PROTECTED]
On Oct 8, 2007, at 1:14 PM, Nils Breunese (Lemonbit) wrote:
Nicholas Mistry wrote:
I am seeing a very strange problem after transitioning to backuppc
3.0. Backups are taking considerably longer, and i am frequently
getting out of memory kernel panics messages dumped to the syslog.
My previous config was a P3-450 w/ 256MB ram, 10GB Internal drive,
and a 700GB external RAID-5 array. This machine ran debian 3.0
and Backuppc 2.x ( i frequently updated it).
The new machine is a P3-800 w/ 256MB ram, 10GB Internal drive, and
a 2.0TB external RAID-6 array. This machine is a fresh install
of debian 4.x and runs Backuppc 3.0
Both machines had aproximately 800MB of swap, and were configured
to do backups via RSYNC/RSYNCD or SMB.
I know that the first machine was slow, it took a whole day to do
a 100GB backup over a 100Mbit link. But the second machine is
taking many days to complete the same job. I started a full
backup on the 3rd of october and it is still running today.
I have already run extensive diagnostics on all the hardware, so i
know that the machine is fine.
Before i start racking my brain, i wanted to find out if anyone
else had experienced this type of problem after moving to backuppc
3? Has anyone seen memory leaks with backuppc running on
debian 4?
No, but 256 MB seems like not a lot of memory if you're using rsync
and arrays that large. Swapping will kill performance. Are you
running your first full backup? I have no idea why it would be
slower now than before.
Nils Breunese.
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