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
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