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From: Peter Mutsaers <plm@xs4all.nl>
Subject: Re: SCSI tape block size
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To: j@uriah.heep.sax.de
Sender: plm@plm.xs4all.nl
Lines: 32
Organization: My Unorganized Home
Message-ID: <87d8ywxp6u.fsf@plm.xs4all.nl>
References: <8720ffxq0j.fsf@plm.xs4all.nl> <536grc$ba@uriah.heep.sax.de>
Date: Sun, 6 Oct 1996 12:16:57 GMT
>> On 5 Oct 1996 20:35:56 GMT, j@uriah.heep.sax.de (J Wunsch) said:
JW> restore(8) will figure it out by itself.
I used cpio since dump/restore does only backup 1 filesystem. I don't
trust to use /dev/nrst0 and put several dumps after each other on 1
tape. How do you deal with multiple (possibly) small filesystems and
dump/restore?
JW> Otherwise, do a:
JW> dd if=/dev/rst0 of=/dev/null bs=64k count=1
JW> ...and see what dd tells you:
JW> j@uriah 158% dd if=/dev/rst0 of=/dev/null bs=64k count=1
JW> 0+1 records in
JW> 0+1 records out
JW> 32768 bytes transferred in 2 secs (16384 bytes/sec)
JW> (Note that 64 KB is the largest blocksize currently supported inside
JW> the kernel by physio(), so there's no use in making the parameter
JW> above larger.)
Reading this it is exactly as I thought is should be, yet I didn't see
the blocksize. The actual reasone was simple: The SCSI driver (for NCR
815) was failing! Restarting the generic install kernel with -c and
disabling the probing for all unneeded devices solved it.
So: the generic kernel (2.1.5 release and current) on the boot floppy
does not work well with SCSI tapes connected through an NCR 815. Is
this a known problem?
--
Peter Mutsaers | Abcoude (Utrecht), | Trust is a good quality
plm@xs4all.nl | the Netherlands | for other people to have