Martin, I am not using Gzip in Bacula. The drive I have does hardware compression I thought that would be enough for now. I seem to be getting about 1.2T on an 800G LTO4 tape.
Here is the iostat output during a full backup. I will try and do the tar test later this week. avg-cpu: %user %nice %system %iowait %steal %idle 0.28 0.00 0.08 0.20 0.00 99.43 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 0.41 3.98 10.42 23966207 62765414 sdb 11.46 1159.01 623.79 6979515937 3756450992 sr1 0.00 0.00 0.00 8 0 sr2 0.00 0.00 0.00 8 0 avg-cpu: %user %nice %system %iowait %steal %idle 5.30 0.00 1.09 6.60 0.00 87.00 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 2.50 2.40 27.97 24 280 sdb 222.88 47629.17 298.10 476768 2984 sr1 0.00 0.00 0.00 0 0 sr2 0.00 0.00 0.00 0 0 avg-cpu: %user %nice %system %iowait %steal %idle 6.26 0.00 1.44 6.09 0.00 86.21 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 1.00 0.80 37.60 8 376 sdb 261.60 54036.00 132.80 540360 1328 sr1 0.00 0.00 0.00 0 0 sr2 0.00 0.00 0.00 0 0 avg-cpu: %user %nice %system %iowait %steal %idle 4.74 0.00 0.83 6.38 0.00 88.05 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 1.40 0.00 31.20 0 312 sdb 181.70 39100.80 133.60 391008 1336 sr1 0.00 0.00 0.00 0 0 sr2 0.00 0.00 0.00 0 0 avg-cpu: %user %nice %system %iowait %steal %idle 6.27 0.00 1.36 5.59 0.00 86.78 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 0.50 0.00 29.60 0 296 sdb 240.30 54162.40 135.20 541624 1352 sr1 0.00 0.00 0.00 0 0 sr2 0.00 0.00 0.00 0 0 -----Original Message----- From: Martin Simmons [mailto:mar...@lispworks.com] Sent: Wednesday, July 08, 2009 9:13 AM To: Bacula-users@lists.sourceforge.net Subject: Re: [Bacula-users] Speed writing to tape drive >>>>> On Mon, 6 Jul 2009 10:14:09 -0700, Hayden Katzenellenbogen said: > > Hello, > > Thanks to a patch published two weeks ago I am finally making headway > into the wonderful world of Bacula. I have a single machine right now > with about 1.2T of data I am backing up. > > When I run the btape fill test I get write speeds of around 70MB/s when > I run a full backup from the local machine I get about 20MB/s is there > anyway to figure out where the bottle neck is? Are you using software compression (gzip) in Bacula? What do "top" and "iostat 10" show when running a backup? You could try using tar to check the speed of your filesystem, e.g. time tar cf /dev/null /some/very/large/directory __Martin ------------------------------------------------------------------------ ------ Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users ------------------------------------------------------------------------------ Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users