On 9/26/07, Tony Nelson <[EMAIL PROTECTED]> wrote: > David Rees wrote: > > Your machine looks fine to me. Your backuppc data partition is a single > > disk? > > My servers disk it 6 250G IDE drives arranged in a RAID5 with 1 Hot > Spare. The Controller is a 3Ware Escalade 7506-8 Controller.
OK, there are some settings which can especially help with 3ware controllers. What is the output of the following files (use cat)? /sys/block/sd*/queue/max_sectors_kb /sys/block/sd*/queue/nr_requests /sys/block/sd*/device/queue_depth Specifically, the queue depth is often much larger than nr_requests, so setting nr_requests to something about twice as big as the queue_depth helps. On a 3ware card, the queue_depth should be about 254, so trying setting nr_requests to 512 like this (assuming sda is your raid array): echo 512 > /sys/block/sda/queue/nr_requests Also setting max_sectors_kb to 64 can help with 3ware raid 5 arrays: echo 64 > /sys/block/sda/queue/max_sectors_kb If the system gets sluggish under high IO load, you can also switch to the deadline IO scheduler: echo deadline > /sys/block/sda/queue/scheduler More info/reference: http://www.3ware.com/KB/article.aspx?id=11050 > > As the others suggested, mounting the backuppc data partition with > > noatime can help. I usually mount all my filesystems with noatime. > > Mounting the backuppc data partition with data=ordered option may > > help, too (the default is data=writeback). > > I'll add data=ordered now Ugh, data=ordered is the default, you should try data=writeback (had it backwards). http://linuxmafia.com/faq/Filesystems/journaled-filesystems.html > I'll try the checksum seed with a test backup now.. Typically, the next backup won't get much faster, IIRC it takes 2-3 backups to realize the full performance from using checksum seed. I don't know if the actual value of checksum seed matters, but 32761 is typically used as suggested in the default config.pl file. -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/
