dump and tape capacity
Thomas Rink
we're trying to set up a backup system with a HP C1537A SCSI DDS-3 streamer
using the `dump' program. The problem is that a tape is full after
only about 40 MB have been written to it! I tried out the `d' switch
to pass the bit density to `dump' (342 MBit / inch for DDS-3), but it
tells me that this setting is invalid. The command line (without specifying
the bit density) looks like this:
salomon:~ # dump 0uf /dev/st0 /usr
DUMP: Date of this level 0 dump: Tue May 11 10:14:59 1999
DUMP: Date of last level 0 dump: the epoch
DUMP: Dumping /dev/hda9 (/usr) to /dev/st0
DUMP: mapping (Pass I) [regular files]
DUMP: mapping (Pass II) [directories]
DUMP: estimated 561213 tape blocks on 14.43 tape(s).
^^^^^ this is about 40 MB / tape!
salomon:~ # df -k
Filesystem 1024-blocks Used Available Capacity Mounted on
...
/dev/hda9 606846 515540 59959 90% /usr
...
Any help is greatly appreciated!!
-- Thomas
Johannes Niess
> -- Thomas
Thomas,
There are various problems with dump on linux. Some of them are
portability of dumps and active file systems. Think about using tar
and have a look at www.amanda.org for good GPL backup software.
Johannes Niess
Rob Komar
: Hi,
: we're trying to set up a backup system with a HP C1537A SCSI DDS-3 streamer
: using the `dump' program. The problem is that a tape is full after
: only about 40 MB have been written to it! I tried out the `d' switch
: to pass the bit density to `dump' (342 MBit / inch for DDS-3), but it
: tells me that this setting is invalid. The command line (without specifying
: the bit density) looks like this:
:
: salomon:~ # dump 0uf /dev/st0 /usr
: DUMP: Date of this level 0 dump: Tue May 11 10:14:59 1999
: DUMP: Date of last level 0 dump: the epoch
: DUMP: Dumping /dev/hda9 (/usr) to /dev/st0
: DUMP: mapping (Pass I) [regular files]
: DUMP: mapping (Pass II) [directories]
: DUMP: estimated 561213 tape blocks on 14.43 tape(s).
: ^^^^^ this is about 40 MB / tape!
:
: salomon:~ # df -k
: Filesystem 1024-blocks Used Available Capacity Mounted on
: ...
: /dev/hda9 606846 515540 59959 90% /usr
: ...
:
: Any help is greatly appreciated!!
You can use the `B' switch to tell it how much the tape can hold.
Cheers,
Rob Komar
parkercj
/usr/sbin/dump -dsbfu 54000 26000 126 <non-rewinding device name> <
filesystem to dump>
Remember "Command Capacity Density Blocksize Device Filesystem" ... the u
is to update the /etc/dumpdates file!
Cheers
CJ
Thomas Rink <t...@hades.labcontrol.com> wrote in message
news:m2hfpk5...@hades.labcontrol.com...
> Hi,
> we're trying to set up a backup system with a HP C1537A SCSI DDS-3
streamer
> using the `dump' program. The problem is that a tape is full after
> only about 40 MB have been written to it! I tried out the `d' switch
> to pass the bit density to `dump' (342 MBit / inch for DDS-3), but it
> tells me that this setting is invalid. The command line (without
specifying
> the bit density) looks like this:
>
> salomon:~ # dump 0uf /dev/st0 /usr
> DUMP: Date of this level 0 dump: Tue May 11 10:14:59 1999
> DUMP: Date of last level 0 dump: the epoch
> DUMP: Dumping /dev/hda9 (/usr) to /dev/st0
> DUMP: mapping (Pass I) [regular files]
> DUMP: mapping (Pass II) [directories]
> DUMP: estimated 561213 tape blocks on 14.43 tape(s).
> ^^^^^ this is about 40 MB / tape!
>
> salomon:~ # df -k
> Filesystem 1024-blocks Used Available Capacity Mounted on
> ...
> /dev/hda9 606846 515540 59959 90% /usr
> ...
>
> Any help is greatly appreciated!!
>
> -- Thomas
>
> t...@labcontrol.com