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From: eho@word.princeton.edu (Eric Ho)
Newsgroups: comp.sys.sun
Subject: dump(8) on the Exabyte (apunix) using no-rewind option ??
Keywords: SunOS
Message-ID: <377@brazos.Rice.edu>
Date: 26 Jul 89 00:06:14 GMT
Sender: root@rice.edu
Organization: Sun-Spots
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X-Sun-Spots-Digest: Volume 8, Issue 84, message 10 of 13

Does anyone tried dumping stuff on the Exabyte tape drive using the
no-rewind option and that it worked correctly (i.e. you can restore the
stuff back correctly) ?  I'm planning to dump several hundred meg of my
stuff onto the Exabyte each night (I figured that 2 or 3 dumps will fill
one tape -- I could have use 1 tape each night but it seems to be a waste
of resource and I don't want to change tape everyday).  Do I have to do 

	mt -f /dev/rxb0 rew
	mt -f /dev/nrxb0 fsf <n>

first and then do the dumps OR just adding

	dump 0uf /dev/nrxb0 <my own filesystem>

into my crontab file would do the job ?

In other words, will dump write out all the file/tape marks correctly for
each transaction and that when I want to restore my own filesystem back,
I'll just need to 'mt -f ... fsf <n>' (where n is the nth night) and then
do a restore ?

I'm doing this on my Sun-4/260 under OS 4.0.1 (Generic kernel + the apunix
exabyte driver).

I'll be nice if I don't need to do all those 'mt' stuff just to append a
dump to the tape though otherwise I'll have to write a script (basically,
to check for what day of week it is and then give the correct number to
'mt ... fsf <n>' and then do the dump).

Any pointers will be much appreciated.

Eric Ho
Cognitive Science Lab.,		Princeton University
voice = 609-987-2819 (x2987)	email = eho@confidence.princeton.edu
					eho@bogey.princeton.edu