Jason Voorhees: > On Thu, Apr 28, 2011 at 12:01 PM, John Drescher <dresche...@gmail.com> wrote: > >> So do you believe these speeds of my backups are normal? I though my > >> Library tape with LTO-5 tapes could write at 140 MB/s approx. It > >> isn't possible to achieve higher speeds? > > > > You need to speed up your source filesystem to achieve better > > performance. Use raid10 or get a SSD. It has nothing at all to do with > > your tape or bacula speed if you hard drive can not read what it needs > > to backup at the maximum network speed. Or do not worry so much how > > much time a single backup is taking and enable concurrency and > > spooling. These will better utilize the speed of your tape drive. > > > > > > John > > strange!, I ran a hdparm test at the fileserver (the source of backup) > and I get a better performance: > > [root@qsrpsfs1 ~]# hdparm -t /dev/mapper/mpath0 > > /dev/mapper/mpath0: > Timing buffered disk reads: 622 MB in 3.00 seconds = 207.20 MB/sec
This is a measure for your peak i/o performance. Average performance will be between 10% to 80% of that, depending on your file mix, moon phase and personal karma. To see wether the file system is indeed the bottleneck you could try to tar the fs to /dev/null and compare the transfer rate to that of your bacula backup. regards, Dietz
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