Date: Thu, 27 Sep 2001 13:52:14 +0200 From: Heinrich Rebehn <rebehn@comm.uni-bremen.de> To: Mark Rowlands <mark.rowlands@minmail.net> Cc: questions@FreeBSD.ORG Subject: Re: PLEASE HELP: Problem backing up multiple filesystems on tape Message-ID: <3BB312EE.8090404@comm.uni-bremen.de> References: <3BB1AFE6.4040106@comm.uni-bremen.de> <3BB2D618.1040705@comm.uni-bremen.de> <20010927085741.4970937B40C@hub.freebsd.org> <20010927093217.7765B37B421@hub.freebsd.org>
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Mark Rowlands wrote:
> On Thursday 27 September 2001 10:57 am, Mark Rowlands wrote:
>
>>On Thursday 27 September 2001 9:32 am, Heinrich Rebehn wrote:
>>
>>>Hi,
>>>
>>>since i did not receive any reply to my post below, i repost.
>>>Does nobody on the list backup his or her data to tape?
>>>Or are you using other tools than dump?
>>>
>>yes, tar!
>>
>>
>>>Please help, since my new server is useless if i cannot back it up!
>>>
>>ok ...send it to me then
>>
>>
>>>The question again: How can i write and retrieve more than one filesystem
>>>to one tape?
>>>
>>hang on and I'll try it here
>>
>>
>>>TIA
>>>
>>>Heinrich Rebehn wrote:
>>>
>>>>Hi list,
>>>>
>>>>I have successfully set up our new department server using 4.3-RELEASE.
>>>>I attached our DLT1 tape drive to the system and tried to do a backup.
>>>>However i am unable to write and retrieve multiple filesystems to one
>>>>tape. I had no problems with that under Solaris, Linux and OpenBSD ,
>>>>but under FreeBSD things seem to be a bit different.
>>>>
>>>>What i tried was:
>>>>
>>>>-----------------------------------------------------------------
>>>>
>>>>root@antsrv1 [~] # mt rewind
>>>>root@antsrv1 [~] # dump 0caf /dev/nrsa0 /
>>>>
>>why c?
>>
>>
>>>> DUMP: Date of this level 0 dump: Wed Sep 26 12:29:25 2001
>>>> DUMP: Date of last level 0 dump: the epoch
>>>> DUMP: Dumping /dev/ad0s1a (/) to /dev/nrsa0
>>>> DUMP: mapping (Pass I) [regular files]
>>>> DUMP: mapping (Pass II) [directories]
>>>> DUMP: estimated 49239 tape blocks.
>>>> DUMP: dumping (Pass III) [directories]
>>>> DUMP: dumping (Pass IV) [regular files]
>>>> DUMP: DUMP: 49254 tape blocks on 1 volume
>>>> DUMP: finished in 31 seconds, throughput 1588 KBytes/sec
>>>> DUMP: Closing /dev/nrsa0
>>>> DUMP: DUMP IS DONE
>>>>
>>>>root@antsrv1 [~] # dump 0caf /dev/nrsa0 /var
>>>>
>>>> DUMP: Date of this level 0 dump: Wed Sep 26 12:30:15 2001
>>>> DUMP: Date of last level 0 dump: the epoch
>>>> DUMP: Dumping /dev/ad0s1e (/var) to /dev/nrsa0
>>>> DUMP: mapping (Pass I) [regular files]
>>>> DUMP: mapping (Pass II) [directories]
>>>> DUMP: estimated 4495 tape blocks.
>>>> DUMP: dumping (Pass III) [directories]
>>>> DUMP: dumping (Pass IV) [regular files]
>>>> DUMP: DUMP: 4489 tape blocks on 1 volume
>>>> DUMP: finished in 1 seconds, throughput 4489 KBytes/sec
>>>> DUMP: Closing /dev/nrsa0
>>>> DUMP: DUMP IS DONE
>>>>
>>>>root@antsrv1 [~] # mt rewind
>>>>root@antsrv1 [~] # restore tf /dev/nrsa0 > /dev/null
>>>>
>>>>Level 0 dump of / on antsrv1.comm.uni-bremen.de:/dev/ad0s1a
>>>>Label: none
>>>>
>>>>root@antsrv1 [~] # restore tf /dev/nrsa0 > /dev/null
>>>>
>>>>Tape is not a dump tape <===!
>>>>
>>>>root@antsrv1 [~] #
>>>>
>>>>-----------------------------------------------------------------
>>>>
>>>>Why am i unable to retrieve the second dump? I also played with
>>>>filemarks, but to no avail.
>>>>Any suggestions?
>>>>
>
> dump -0 -a -f /dev/nrsa0 /var
> dump -0 -a -f /dev/nrsa0 /spare
> mt -f /dev/nrsa0 rewind
> restore -t -f /dev/nrsa0
> bunch of stuff indicating data from /var
> mt -f /dev/nrsa0 rewind
> mt -f /dev/nrsa0 fsf 1
> restore -t -f /dev/nrsa0
> bunch of stuff indicating data from /spare
>
> so it works here - minus that funny little "c" option :-
> -c Change the defaults for use with a cartridge tape drive, with a
> density of 8000 bpi, and a length of 1700 feet.
>
>
Thank you for your help, Mark. I didn't know about 'mt fsf 1'. Did not need it
on other OS's. Now dump of multiple filesystems works, but unreliable :-( (see
my new post 'dump unreliable?'
Heinric
Heinrich Rebehn
"Have disk - will travel"
University of Bremen
Physics / Electrical and Electronics Engineering
- Department of Telecommunications -
E-mail: mailto:rebehn@comm.uni-bremen.de
Phone : +49/421/218-4664
Fax : -3341
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