Re: [Dump-users] RE: Dump HOWTO

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

Stelian Pop wrote:
[...]
> if you set the blocksize with 'mt setblk 32768', are you able
> to do a 'dd ofs=32k' onto the tape ?
> 
> I'm really not sure it's dump's fault or the driver/drive fault...

It works well using dump with 32KB blocks:

# mt setblk 32768
# /sbin/dump 0ab 32 /tmp 
  DUMP: Date of this level 0 dump: Tue Jun 27 12:16:32 2000
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping /dev/hdb11 (/tmp) to /dev/nst0
  DUMP: Label: none
  DUMP: mapping (Pass I) [regular files]
  DUMP: mapping (Pass II) [directories]
  DUMP: estimated 57048 tape blocks.
  DUMP: Volume 1 started at: Tue Jun 27 12:16:32 2000
  DUMP: dumping (Pass III) [directories]
  DUMP: dumping (Pass IV) [regular files]
  DUMP: Closing /dev/nst0
  DUMP: Volume 1 completed at: Tue Jun 27 12:18:30 2000
  DUMP: Volume 1 took 0:01:58
  DUMP: Volume 1 transfer rate: 483 KB/s
  DUMP: 57058 tape blocks (55.72MB) on 1 volume(s)
  DUMP: finished in 116 seconds, throughput 491 KBytes/sec
  DUMP: Date of this level 0 dump: Tue Jun 27 12:16:32 2000
  DUMP: Date this dump completed:  Tue Jun 27 12:18:30 2000
  DUMP: Average transfer rate: 483 KB/s
  DUMP: DUMP IS DONE

Now try dd:

# mt setblk 32768
# /sbin/dump 0af - /tmp | dd obs=32k of=$TAPE
  DUMP: Date of this level 0 dump: Tue Jun 27 12:22:01 2000
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping /dev/hdb11 (/tmp) to standard output
  DUMP: Label: none
  DUMP: mapping (Pass I) [regular files]
  DUMP: mapping (Pass II) [directories]
  DUMP: estimated 57048 tape blocks.
  DUMP: Volume 1 started at: Tue Jun 27 12:22:02 2000
  DUMP: dumping (Pass III) [directories]
  DUMP: dumping (Pass IV) [regular files]
  DUMP: Volume 1 completed at: Tue Jun 27 12:23:53 2000
  DUMP: Volume 1 took 0:01:51
  DUMP: Volume 1 transfer rate: 513 KB/s
  DUMP: 57036 tape blocks (55.70MB)
  DUMP: finished in 111 seconds, throughput 513 KBytes/sec
  DUMP: Date of this level 0 dump: Tue Jun 27 12:22:01 2000
  DUMP: Date this dump completed:  Tue Jun 27 12:23:53 2000
  DUMP: Average transfer rate: 513 KB/s
  DUMP: DUMP IS DONE
dd: /dev/nst0: Input/output error
114060+0 records in
1782+0 records out

Using 10KB blocks with tape drive set to 32KB:

# /sbin/dump 0af - /tmp | dd obs=10k of=$TAPE
  DUMP: Date of this level 0 dump: Tue Jun 27 12:24:45 2000
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping /dev/hdb11 (/tmp) to standard output
  DUMP: Label: none
  DUMP: mapping (Pass I) [regular files]
  DUMP: mapping (Pass II) [directories]
  DUMP: estimated 57048 tape blocks.
  DUMP: Volume 1 started at: Tue Jun 27 12:24:45 2000
  DUMP: dumping (Pass III) [directories]
dd: /dev/nst0: Input/output error
20+0 records in
0+0 records out
  DUMP: Broken pipe
  DUMP: The ENTIRE dump is aborted.

# /sbin/dump 0a /tmp
  DUMP: Date of this level 0 dump: Tue Jun 27 12:25:35 2000
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping /dev/hdb11 (/tmp) to /dev/nst0
  DUMP: Label: none
  DUMP: mapping (Pass I) [regular files]
  DUMP: mapping (Pass II) [directories]
  DUMP: estimated 57048 tape blocks.
  DUMP: Volume 1 started at: Tue Jun 27 12:25:35 2000
  DUMP: dumping (Pass III) [directories]
[waiting... nothing happens...]