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- Newsgroups: comp.sys.hp
- Path: sparky!uunet!elroy.jpl.nasa.gov!ames!sgi!fido!zola!zuni!anchor!olson
- From: olson@anchor.esd.sgi.com (Dave Olson)
- Subject: Re: moving tar file on DAT (4mm) tape between HP and SGI???
- Message-ID: <nmemti8@zuni.esd.sgi.com>
- Sender: news@zuni.esd.sgi.com (Net News)
- Organization: Silicon Graphics, Inc. Mountain View, CA
- References: <fish.711910541@news2.gsfc.nasa.gov> <7371166@hpfcso.FC.HP.COM>
- Date: Fri, 24 Jul 92 07:20:26 GMT
- Lines: 31
-
- In <7371166@hpfcso.FC.HP.COM> kinsell@hpfcso.FC.HP.COM (Dave Kinsell) writes:
- | In comp.sys.hp, fish@daacdev1.stx.com writes:
- |
- | > hi, i'm trying to write a tar archive to a 4mm DAT tape on
- | > an HP 720 (hpux 8.05) and then read it on an SGI 440s (irix
- | > 4.0.1) and it sez: checksum error, giving up...
- | >
- | > i just used plain old tar cvf to create it on the HP and then
- | > checked it with tar tvf and all was fine then came over to
- | > the SGI and it won't read it (even dd won't read anything off
- | > of it) - any ideas?
- |
- | I'll bet you're not using an HP dat drive. Tar tvf sends out a
- | write 0 filemarks command, conventionally used by drivers to flush
- | buffers. Some drives write 0 filemarks, then write an EOD mark.
- | This clobbers all your data. Try skipping the tvf pass, or write
- | protect the cartridge first.
-
- I strongly doubt this, since he said he could read the tape on
- HP after creating it, and very few recent drives are this braindead.
- (Our driver also uses a write 0 fm cmd, and I've never heard of
- a drive that dies with it.)
-
- More than likely he is using the minor device on the SGI that causes
- the driver to byte swap the data; more recent (4.0.5 IRIX) versions
- of our tar will report this problem.
-
- --
- Let no one tell me that silence gives consent, | Dave Olson
- because whoever is silent dissents. | Silicon Graphics, Inc.
- Maria Isabel Barreno | olson@sgi.com
-