On 9/19/07, Tony Nelson <[EMAIL PROTECTED]> wrote: > David Rees wrote: > > Your backup server is showing about 22% waiting on disk IO, how many > > processors and what type of disk/filesystem is your backuppc data > > partition on? > > The system has 2 dual core Xeon processors.
That's what I expected given the slightly less than 25% disk wait, one of the processors is just sitting there for disk IO most of the time. > The filesystem is a 1.5TB Hardware controlled RAID Array made up of > 250GB IDE (not SATA) drives, in a Penguin Computing Relion 430 server. What kind of RAID? (1, 5, 10, etc) > The filesystem is a ReiserFS (M5 hash if memory serves) filesystem, > mounted as: > > /dev/sda1 /var/lib/backuppc reiserfs noatime 1 2 I know some people like using reiserfs for some reason, but I seem to recall having slow IO performance over lots of small files a while back using it. I use ext3 on all my backuppc servers myself. > I'm not aware of the checksum-seed option to rsync, but I'll look it up > and add it tonight, and see how the backup goes. The check-sum seed option will definitely reduce the IO load on the server by some amount. This was added in rsync 2.6.3 (30 Sep 2004) so any halfway recent distro should support it. > It turns out my guess was way wrong. > > New > 3086 Files > 1572.8MB Data If you're getting that much new data a day, you should try to run full backups more frequently, or upgrade to BackupPC 3 which supports multi-level rsync incrementals. > I also see looking at that page, I haven't had a good full backup in > quite some time. I manually schedule this particular backup out of cron > to ensure that it starts at the same time every day and it looks like > the full from the past couple of weekends failed. I wonder if that is > affecting performance. That is definitely affecting performance since for each incremental backup, you need to transfer over all the data that has changed since the last full backup (unless you are using multi-level rsync incrementals in BackupPC 3). Also available in BackupPC 3.1 beta, you can install the IO::Dirent perl module on the server which should also improve backuppc performance during trash clean operations. -Dave ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ BackupPC-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/backuppc-users http://backuppc.sourceforge.net/
