The top speed I've achieved with an IBM 3581 L38 was around 30 MB/s on a test 
(btest).

With bacula, local disk (sata):

 JobId:                  1384
  Job:                    srv-backup.2006-10-27_22.05.07
  Backup Level:           Full
  Client:                 "srv-backup" x86_64-unknown-linux-gnu,suse,10.0
  FileSet:                "srv-backup-fs" 2006-05-11 11:18:34
  Pool:                   "Default"
  Storage:                "lto"
  Scheduled time:         27-Oct-2006 22:05:06
  Start time:             28-Oct-2006 03:49:40
  End time:               28-Oct-2006 04:33:46
  Elapsed time:           44 mins 6 secs
  Priority:               500
  FD Files Written:       216,994
  SD Files Written:       216,994
  FD Bytes Written:       48,200,304,853 (48.20 GB)
  SD Bytes Written:       48,231,485,273 (48.23 GB)
  Rate:                   18216.3 KB/s
  Software Compression:   None
  Volume name(s):         bac-0001
  Volume Session Id:      31
  Volume Session Time:    1161792332
  Last Volume Bytes:      222,847,029,453 (222.8 GB)
  Non-fatal FD errors:    0
  SD Errors:              0
  FD termination status:  OK
  SD termination status:  OK
  Termination:            Backup OK

and over a Gb net:

29-Oct 04:27 srv-backup-dir: Bacula 1.38.11 (28Jun06): 29-Oct-2006 04:27:53
  JobId:                  1387
  Job:                    bd-unrc-full.2006-10-29_04.01.00
  Backup Level:           Full
  Client:                 "bd-unrc" x86_64-unknown-linux-gnu,suse,10.0
  FileSet:                "bd-unrc_full-fs" 2006-07-14 12:55:52
  Pool:                   "Default"
  Storage:                "lto"
  Scheduled time:         29-Oct-2006 04:01:00
  Start time:             29-Oct-2006 04:01:24
  End time:               29-Oct-2006 04:27:53
  Elapsed time:           26 mins 29 secs
  Priority:               10
  FD Files Written:       131,196
  SD Files Written:       131,196
  FD Bytes Written:       31,528,273,511 (31.52 GB)
  SD Bytes Written:       31,545,629,755 (31.54 GB)
  Rate:                   19841.6 KB/s
  Software Compression:   None
  Volume name(s):         bac-0001
  Volume Session Id:      32
  Volume Session Time:    1161792332
  Last Volume Bytes:      254,420,061,578 (254.4 GB)
  Non-fatal FD errors:    0
  SD Errors:              0
  FD termination status:  OK
  SD termination status:  OK
  Termination:            Backup OK

I believe the bottleneck are the disks/network.

El Miércoles, 8 de Noviembre de 2006 10:00, Adam Huffman escribió:
> What sort of backup speed should I expect when using Bacula with an
> LTO3 library?
>
> I'm seeing nothing like the advertised 60-80MB/s.
>
>
> Adam

-- 
Cris.

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