Shamless bump. Does anyone have any insight into this?
Thanks
brian-
On 12/28/2009 2:12 PM, Brian Debelius wrote:
> Hi,
> I am trying to improve my LTO-3 throughput. I recently installed a
> SAS Tandberg LTO-3 drive. I am using Bacula 3.0.3 in Ubuntu. I
> backup to disk files, and then copy to tape. The disk files are 4GB
> in size. They are stored on a 4 disk RAID 5 array. The raid and the
> tape drive are in the same system.
>
> dd'ing a file from the raid to /dev/null yields:
> #dd if=vol-0572 of=/dev/null
> 8388576+1 records in
> 8388576+1 records out
> 4294951097 bytes (4.3 GB) copied, 45.0316 s, 95.4 MB/s
>
> disabling compression on the tape drive, and
> dd'ing the file from raid to /dev/nst1 yields:
> #dd if=vol-0572 of=/dev/nst1 bs=64K
> 65535+1 records in
> 65535+1 records out
> 4294951097 bytes (4.3 GB) copied, 77.9708 s, 55.1 MB/s
>
> enabling compression on the tape drive, and
> dd'ing the file from raid to /dev/nst1 yields:
> #dd if=vol-0572 of=/dev/nst1 bs=64K
> 65535+1 records in
> 65535+1 records out
> 4294951097 bytes (4.3 GB) copied, 43.1465 s, 99.5 MB/s
>
> These are the copy job throughput rates. The parent jobs of these
> three run concurrently, so all three jobs are in the same disk files.
> Rate: 5GB @ 22282.1 KB/s
> Rate: 8GB @ 22787.8 KB/s
> Rate: 5GB @ 19648.1 KB/s
>
> With the next two jobs, they do not run concurrent, so each disk file
> only contains the data of one job.
> Rate: 290GB @ 25024.7 KB/s
> Rate: 58GB @ 27998.8 KB/s
>
> This seems slower then it should be.
>
> brian-
>
>
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