thank much! will try testing with btape. btw, I ran with 20GB maximum
file size/2MB max block (see bacula-sd.conf below) and got these
results, 20MB/s increase, ran 20 minutes faster, got 50MBs -- now if I
can just double the speed I could backup 15TB in about 45/hrs. I don't
have that much data yet, but I'm hovering at 2TB and looking to expand
sharply over time. I'm not doing any networking, it just straight from
a raid 5 to a autochanger/lto-4. gary
Build OS: x86_64-redhat-linux-gnu redhat
JobId: 6
Job: Prodbackup.2011-11-30_18.49.24_06
Backup Level: Full
Client: "bacula-fd" 5.0.3 (04Aug10)
x86_64-redhat-linux-gnu,redhat,
FileSet: "FileSetProd" 2011-11-30 15:23:58
Pool: "FullProd" (From Job FullPool override)
Catalog: "MyCatalog" (From Client resource)
Storage: "LTO-4" (From Job resource)
Scheduled time: 30-Nov-2011 18:49:15
Start time: 30-Nov-2011 18:49:26
End time: 30-Nov-2011 20:14:56
Elapsed time: 1 hour 25 mins 30 secs
Priority: 10
FD Files Written: 35,588
SD Files Written: 35,588
FD Bytes Written: 257,543,092,723 (257.5 GB)
SD Bytes Written: 257,548,504,514 (257.5 GB)
Rate: 50203.3 KB/s
Software Compression: None
VSS: no
Encryption: no
Accurate: no
Volume name(s): f2
Volume Session Id: 2
Volume Session Time: 1322707293
Last Volume Bytes: 257,600,822,272 (257.6 GB)
Non-fatal FD errors: 0
SD Errors: 0
FD termination status: OK
SD termination status: OK
Termination: Backup OK
bacula-sd.conf:
Device {
Name = LTO-4
Media Type = LTO-4
Archive Device = /dev/nst0
AutomaticMount = yes; # when device opened, read it
AlwaysOpen = yes;
RemovableMedia = yes;
RandomAccess = no;
#Maximum File Size = 12GB
Maximum File Size = 20GB
#Maximum Network Buffer Size = 65536
Maximum block size = 2M
#Spool Directory = /db/bacula/spool/LTO4
#Maximum Spool Size = 200G
#Maximum Job Spool Size = 150G
Autochanger = yes
Alert Command = "sh -c 'tapeinfo -f %c |grep TapeAlert|cat'"
Alert Command = "sh -c 'smartctl -H -l error %c'"
}
On Wed, Nov 30, 2011 at 11:48 PM, Andrea Conti <a...@alyf.net> wrote:
> On 30/11/11 19.43, gary artim wrote:
>> Thanks much, I'll try today the block size change first. Then try the
>> spooling. Dont have any unused disk, but may have to try on a shared
>> drive.
>> The "maximum file size" should be okay? g.
>
> Choosing a max file size is mainly a tradeoff between write performance
> (as the drive will stop and restart at the end of each file to write an
> EOF mark) and restore performance (as the drive can only seek to a file
> mark and then sequentially read through the file until the relevant data
> bocks are found).
>
> I usually set maximum file size so that there are 2-3 filemarks per tape
> wrap (3GB for LTO3, 5GB for LTO4), but if you don't plan to do regular
> restores, or if you always restore the whole contents of a volume, 12GB
> is fine.
>
> Anyway, with the figures you're citing your problem is *not* maximum
> file size.
>
> Try to assess tape performance alone with btape test (which has a
> "speed" command); you can try different block sizes and configuration
> and see which one gives the best results.
>
> Doing so will give you a clear indication on whether your bottleneck is
> in tape or disk throughput.
>
> andrea
>
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