[Dump-users] Re: dump performance

[Bernhard E. <be...@be...>]

Here some of my results... (System is an AMD K6-233, harddisk
IBM-DJNA-372200, Red Hat Linux 6.1, dump 0.4b14-1)

To another partition on the same physical drive:

# /sbin/dump 0sf 100000 home-200002171500.dump /home/
  DUMP: Date of this level 0 dump: Thu Feb 17 15:01:41 2000
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping /dev/hdc14 (/home) to home-200002171500.dump
  DUMP: Label: none
  DUMP: mapping (Pass I) [regular files]
  DUMP: mapping (Pass II) [directories]
  DUMP: estimated 847938 tape blocks on 0.50 tape(s).
  DUMP: Volume 1 started at: Thu Feb 17 15:01:44 2000
  DUMP: dumping (Pass III) [directories]
  DUMP: dumping (Pass IV) [regular files]
  DUMP: 89.80% done, finished in 0:00
  DUMP: DUMP: 860256 tape blocks on 1 volumes(s)
  DUMP: finished in 333 seconds, throughput 2583 KBytes/sec
  DUMP: Volume 1 completed at: Thu Feb 17 15:07:17 2000
  DUMP: Volume 1 took 0:05:33
  DUMP: Volume 1 transfer rate: 2583 KB/s
  DUMP: DUMP: Date of this level 0 dump: Thu Feb 17 15:01:41 2000
  DUMP: DUMP: Date this dump completed:  Thu Feb 17 15:07:17 2000
  DUMP: DUMP: Average transfer rate: 2583 KB/s
  DUMP: Closing home-200002171500.dump
  DUMP: DUMP IS DONE

To /dev/null:

# /sbin/dump 0sf 100000 /dev/null /home 
  DUMP: Date of this level 0 dump: Thu Feb 17 15:44:53 2000
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping /dev/hdc14 (/home) to /dev/null
  DUMP: Label: none
  DUMP: mapping (Pass I) [regular files]
  DUMP: mapping (Pass II) [directories]
  DUMP: estimated 848032 tape blocks on 0.50 tape(s).
  DUMP: Volume 1 started at: Thu Feb 17 15:44:57 2000
  DUMP: dumping (Pass III) [directories]
  DUMP: dumping (Pass IV) [regular files]
  DUMP: DUMP: 860411 tape blocks on 1 volumes(s)
  DUMP: finished in 127 seconds, throughput 6774 KBytes/sec
  DUMP: Volume 1 completed at: Thu Feb 17 15:47:04 2000
  DUMP: Volume 1 took 0:02:07
  DUMP: Volume 1 transfer rate: 6774 KB/s
  DUMP: DUMP: Date of this level 0 dump: Thu Feb 17 15:44:53 2000
  DUMP: DUMP: Date this dump completed:  Thu Feb 17 15:47:04 2000
  DUMP: DUMP: Average transfer rate: 6774 KB/s
  DUMP: Closing /dev/null
  DUMP: DUMP IS DONE