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From: gabby@gabs.lbl.gov (Gabby Obegi)
Newsgroups: comp.sys.hp
Subject: Re: dump on a DAT
Keywords: help
Message-ID: <13695@dog.ee.lbl.gov>
Date: 30 May 91 02:07:33 GMT
References: <14272@ur-cc.UUCP>
Reply-To: gabby@lbl.gov (Gabby Obegi)
Organization: Lawrence Berkeley Laboratory, Berkeley
Lines: 50
X-Local-Date: Wed, 29 May 91 19:07:34 PDT

In article <14272@ur-cc.UUCP> jcm8_cif@troi.cc.rochester.edu (Judy Mathers) writes:
>We just got a DAT drive at work, and we'd like to run dump for backup.
>Currently we are just tarring everything to tape which is a bit slow and
>inefficient.  I was wondering if anyone had used dump and can supply the
>necessary parameters.  

We've got twelve 9000 s300/400 servers with a total of over 10 Gigabytes that
we've been backing up on an Exabyte using the dump command.  We've been doing
this for more than a year now and it's worked very well.  Here are the
commands we're using, followed by what you should do with them:

For a local dump -

  /etc/dump ${dump_level}budfs 20 54000 ${device_file} 6000 /

To dump a remote disk onto the local tape -

   remsh ${remote_host}  "/etc/dump ${dump_level}budfs 20 54000 - 6000 /" | \
   dd obs=20b of=${device_file}

The above commands contain variables used in our backup script; replace these
with what you need.

Explanation of command line arguments:

dump_level - dump wil backup any file that is newer that the last dumpdate of
             the same level or lower. So, use dump_level 0 for a base backup
             and a dump_level higher for incremental backups.
b          - specifies block size.  20 is standard.
u          - write the date and time to /etc/dumpdates, only if it completes
			 successfully.
d          - This is a density option.  It's used to calculate the amount of
             tape being used and has no affect on the way the data is written.
f          - allows you to specify the outfile name or device file name.
s          - The size of the dump tape in feet.  We use 6000 for 2.2 Gbytes,
			 I suggest you try 3500.

These command should do the job, but if you'd like more information on the
backup scripts we use, let me know.

=============================================================================
Gabby Obegi, CAE Systems Manager
Lawrence Berkeley Laboratory
MS 90-2148                                                 (415) 486-5209
1 Cyclotron Rd                                       Fax:  (415) 486-6668
Berkeley, CA. 94720                             Internet: G_Obegi@LBL.gov
=============================================================================

--
-Gab