From owner-freebsd-questions  Wed Feb 21 14:53:10 2001
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Date: Wed, 21 Feb 2001 14:50:21 +0000
From: "Randy B. Lim" <randy.lim@aht.com>
Organization: FW
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To: "Scott B. Gale" <scott@doheny.beach.net>, questions@FreeBSD.ORG
Cc: randy.lim@aht.com
Subject: Re: How to change the tape size in the dump command
References: <Pine.BSF.4.21.0102201625170.55096-100000@doheny.beach.net>
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The following is what I got with the dump command, It seemed dump detect the end
of tape(But I just use
# mt -f /dev/ht0 rewind
to set the tape in the beginning position.


[root@fwdoc rblim]# /sbin/dump -0u -B 30000000 -f /dev/ht0 /dev/da0s1a1
  DUMP: Date of this level 0 dump: Wed Feb 21 15:07:45 2001
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping /dev/hda1 (/) to /dev/ht0
  DUMP: mapping (Pass I) [regular files]
  DUMP: mapping (Pass II) [directories]
  DUMP: estimated 4384518 tape blocks on 0.15 tape(s).
  DUMP: End of tape detected
  DUMP: Closing /dev/ht0
  DUMP: Change Volumes: Mount volume #2
  DUMP: Is the new volume mounted and ready to go?: ("yes" or "no")

The information about the tape is

[root@fwdoc rblim]# dmesg | grep ht0
ide-tape: hdd <-> ht0: OnStream DI-30 rev 1.05
ide-tape: hdd <-> ht0: 990KBps, 64*32kB buffer, 10208kB pipeline, 60ms tDSC


Any ideas?











"Scott B. Gale" wrote:

> On Tue, 20 Feb 2001, Randy B. Lim wrote:
>
> > Hi,
> >
> > I got a 30 GB IDE tape (/dev/nht0) and I want to dump 4GB /root partition to
> > the tape. How to use the dump command to let the 4GB dumped to one single
> > tape?
>
> If the -a "auto-size" option isn't working to get dump to size the tape
> properly you can use the -B option to specify how many 1k blocks the tape
> will hold.  For instance, to do a level zero backup of my root partition
> (with device name /dev/da0s1a) onto a 30 GB tape in device /dev/nht0 I
> would use the following command:
>
> dump -0u -B 30000000 -f /dev/nht0 /dev/da0s1a





>
>
> I've been told it is generally better practice to use the device name to
> specify the root partition rather than "/".  You can get the device name
> by using the df command.
>
> >
> > Best Regards,
> >
> > -Randy
> >
> >
> > To Unsubscribe: send mail to majordomo@FreeBSD.org
> > with "unsubscribe freebsd-questions" in the body of the message
> >
>
> Hope this helps!
>
> Scott B. Gale
> Dana Point Communications


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