Date: Fri, 02 Jul 1999 08:42:27 -1000 From: "Art Neilson, KH7PZ" <art@hawaii.rr.com> To: Greg Lewis <glewis@ares.maths.adelaide.edu.au> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Density for tapes with dump Message-ID: <3.0.6.32.19990702084227.03317200@clients1.hawaii.rr.com> In-Reply-To: <199907021726.CAA61497@ares.maths.adelaide.edu.au>
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Please let me know anything you discover on this subject!! I also have
a Seagate TapeStor drive, CTT8000A - Seagate bought Conner and didn't
change the model number to ST8000A at first ... :^) Anyway, I remember
trying to get his drive to work under FreeBSD 2.2.2 then 2.2.5, 2.2.6
2.2.7 etc I wasn't aware that FreeBSD had support for ATAPI tape drives.
I'm currently on FreeBSD 3.2-R, is there ATAPI tape support at that level?
At 02:56 AM 7/3/99 +0930, you wrote:
>Hi all,
>
>My home system is currently a 3.0-R beast which I'm wanting to upgrade to
>3.2-R. Shouldn't be a problem, but I'd like to do a backup first. I have
>an atapi tape drive which detects as
>
>wdc1: unit 0 (atapi): <Seagate STT8000A/5.02>, removable, accel, dma, iordis
>wst0: Drive empty, readonly, reverse, qfa, ecc, 512b
>wst0: Max speed=600Kb/s, Transfer limit=52 blocks, Buffer size=728 blocks
>
>(a Seagate TapeStor Travan TR-4 tape drive). Unfortunately the density
>seems incorrectly set as when I try to dump my file systems it clearly
>gets its calculations wrong:
>
> DUMP: estimated 3821513 tape blocks on 97.88 tape(s).
>
>These are 4GB tapes. I'd really like to have a hard drive that took 100
>tapes to back up, but no such luck ;). "mt -f /dev/rwst0 status" tells me:
>
>Mode Density Blocksize bpi Compression
>Current: X3.22-1983 512 bytes 800 none
>---------available modes---------
>0: 0x00 variable 0 none
>1: 0x00 variable 0 none
>2: 0x00 variable 0 none
>3: 0x00 variable 0 none
>
>I'm sure the 800bpi number is wrong, and I know I can give the correct
>argument to dump with the -d option, but I've no idea how to calculate
>what it is. Is bpi bytes/inch or blocks/inch? I know the tapes are 740ft
>long, or thats what the manual for the drive tells me :).
>
>Any help appreciated, thanks.
>
>--
>Greg Lewis glewis@trc.adelaide.edu.au
>Computing Officer +61 8 8303 3237
>Teletraffic Research Centre
>
>
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>
__
/ ) _/_ It is a capital mistake to theorise before one has data.
/--/ __ / Insensibly one begins to twist facts to suit theories,
/ (_/ (_<__ Instead of theories to suit facts.
-- Sherlock Holmes, "A Scandal in Bohemia"
Arthur W. Neilson III, KH7PZ
Bank of Hawaii Tech Support
art@hawaii.rr.com
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