Re: [BackupPC-users] BackupPC_Link takes ages
2012-07-05 09:06:11
On 05/07/12 22:12, jonas wrote:
> Hello,
>
> recently we were forced to re-setup a large BackupPC-server
with up to
> 150 clients and 5.0TB (12 disks in RAID10). This was several
weeks ago.
>
> Unfortunately the server has problems keeping up with the
backups since
> then. (see
>
http://sourceforge.net/mailarchive/message.php?msg_id=29433950)
Even
> after enabling rsync checksum caching and playing around with
raising or
> lowering MaxBackups, MaxPendingCmds, the server doesn't scale
as
> expected. And just for the record: before the re-setup, it
managed the
> same amount of backups and the same hosts.
>
> Now while comparing BackupPC logs to another big
BackupPC-server on our
> side, I recognized that BackupPC-Link takes ages for every
backupped
> host on the new server, while it's incredibly fast on the
other BackupPC
> server.
>
> Even for hosts with several 100GB of data, BackupPC_Link
takes only few
> minutes on the old BackupPC server. On the new (re-setup)
one, it takes
> several hours up to days for backupped hosts.
>
> Do you have any idea or suggestions why BackupPC_Link takes
that long
> and how we can change it?
One thing this sounds like is that you moved the location for the
backups, therefore instead of linking the files, every backup is
actually a full copy (because the links fail to the pool/cpool).
Check the backuppc log files and see if anything unusual is being
logged.
Failing that, consider the things that have changed from the old
server to the "re-setup server":
1) Hardware - hard drives, controller, amount of RAM, etc....
2) Filesystem or hard drive layout/configuration (ie, RAID level,
layout, chunk size, ext3 compared to jfs, etc)
3) Double check (while the system is idle if possible) the
performance of the server, disk speed, especially random read/write
performance).
4) Consider that if all clients are configured at the same time,
then all clients will start doing full backups on the same days,
which will screw with performance. Try to manually run full backups
on some clients to skew the timelines, so that full backups are
spread across different days.
Hope something above helps or triggers some idea of the issue.
Regards,
Adam
--
Adam Goryachev
Website Managers
www.websitemanagers.com.au
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