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- From: raines@fermi.physics.upenn.edu (Paul Edgar Raines)
- Newsgroups: comp.sys.sgi
- Subject: problems with 8500 Exabyte
- Message-ID: <87106@netnews.upenn.edu>
- Date: 26 Aug 92 19:04:10 GMT
- Sender: news@netnews.upenn.edu
- Lines: 37
- Nntp-Posting-Host: fermi.physics.upenn.edu
-
- I have two Aviv 8500 Exabyte drives hooked up to a 4D/380S. Our
- problems are characterized by the following:
-
- 1) After loading a tape into a drive, the first operation always gives
- an I/O error. An second try of the same command always seems
- to work.
-
- 2) Reading a tape always produces the following type message on the
- system console.
-
- NOTICE: SCSI tape #5 had 174471 recoverable errors.
-
- This notice was obtained from a bru backup tape obtained by the
- command "bru -cvm -f /dev/rmt/tps1d5nsv.8500 / /usr" which I
- then 'read' using "dd if=/dev/rmt/tps1d5nsv.8500 ibs=63k > /dev/null"
- for 7395 records worth.
-
- 3) Even when specifying 8500 on the end of the device name, the tapes
- seem to written in low density. I haven't yet written more than
- 2 GB to a tape so the way I am currently testing this is by
- timing the kilobytes/sec using the 'dd' command as above. This
- always comes out to be between 200-300 kb/sec for both tapes
- I know are 8200 mode and those that I think I have written in
- 8500 mode.
-
- I have talked to an Aviv tech support person who believes that
- problems (1) and (2) are related to SGI's driver not responding to
- the 'unit attention' signal correctly.
-
- Is there easy way to determine what density a tape has been written in?
- Are there any other sources of ioctl tape commands beside the mtio man
- page and cryptic mtio.h and tpsc.h include files?
-
- --
- Paul Raines raines@purcell.physics.upenn.edu 215-898-8832
- Dept. of Physics
- University of Pennsylvania
-