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- Newsgroups: comp.sys.sun.admin
- Path: sparky!uunet!mcsun!dxcern!procyon!hemmer
- From: hemmer@procyon.cern.ch (Frederic Hemmer ATD10)
- Subject: Re: Exabyte 8500 - Dump parameters
- Message-ID: <1992Jul31.123118.23028@dxcern.cern.ch>
- Sender: hemmer@procyon (Frederic Hemmer ATD10)
- Organization: CERN - European Laboratory for Particle Physics
- References: <25876.9207241150@thor.cf.ac.uk> <1992Jul27.084023.22925@ericsson.se> <BRTMAC.92Jul27094933@maverick.ksu.ksu.edu>
- Date: Fri, 31 Jul 1992 12:31:18 GMT
- Lines: 66
-
- In article <BRTMAC.92Jul27094933@maverick.ksu.ksu.edu>, brtmac@maverick.ksu.ksu.edu (Brett McCoy) writes:
- > In article <1992Jul27.084023.22925@ericsson.se> etxorst@eos.ericsson.se (Torsten Lif) writes:
- >
- > >>I just got off the phone to our Exabyte drive suppliers technical
- > >>department, according to them using /dev/rstn+8 for 5GB density is fine,
- > >>as long as the tape is new. If your tape has been used on an Exabyte
- > >>8200 unit the new 8500 drive will continue to use the tape as a 2.3 GB
- > >>tape.
- > >
- > >Yes-and-no. Addressing /dev/nrst(n+8) makes no difference on those of
- > >our machines that run SunOS 4.1.1, but on this machine (an SS10/41
- > >running SunOS 4.1.3-beta) it works as described. I haven't yet had time
- > >to try it on 4.1.2 and I don't know if patches for the older OS
- > >versions are available. Can anyone else shed some light on this?
- >
- > According to the EXB-8500 Users Manual the 8500, when positioned at
- > PBOT will write at whichever density you tell it to. Under SunOS
- > 4.1.2 the tape devices /dev/{r,nr}st[0-7] are 8200 format and
- > /dev/{r,nr}st[8-15] are 8500 format. More information is available
- > from 'man st'. If you write to an EXB-8500 anywhere but the beginning
- > it will ignore the density setting you tell it and will write at the
- > same density the rest of the tape has been written at.
- >
- > Under SunOS 4.1.1 and below there is no support for 8500 drives which
- > is why it will write 8200 format if the tape was already written. I
- > believe that if you don't tell the drive what to do it assumes that
- > you want to use the format that is already on the tape.
- >
- > ++Brett;
-
- SunOS 4.1.1 actually can support 8500. It just needs to be helped a little
- bit :
-
- on sun3, sun4 architectures modify /sys/sundev/streg.h :
- add an entry for 8500 with the low-density flag as first device :
-
- /* Exabyte 8mm 5GB cartridge */ \
- { "Exabyte", 16, "EXABYTE EXB-8500", ST_TYPE_EXABYTE, \
- 1024, (ST_VARIABLE | ST_BSF | ST_BSR | ST_LONG_ERASE | ST_PHYSREC), \
- 30, 30, 30, 30, 60, 60, 60, 60, \
- 0x14, 0x00, 0x00, 0x00, 0, 0, 0, 0 }, \
-
- on sun4c (sun4m must have at least 4.1.2) modify /sys/scsi/targets/st_conf.c
- add an entry for 8500 with the low-density flag as first device :
-
- "Exabyte EXB-8500 8mm Helical Scan", 16, "EXABYTE EXB-8500",
- ST_TYPE_EXB8500, 1024,
- (ST_VARIABLE | ST_BSF | ST_BSR | ST_LONG_ERASE),
- 5000, 5000,
- { 0x14, 0x00, 0x00, 0x00 },
- { 0, 0, 0, 0 }
-
- and rebuild kernel. This will then use the 0x14 for rst{n} turning the 8500
- in low density. rst{n+8} will be the normal mode. Note that an 8200 will not
- accept the 0x14 density flag so this entry will NOT work for 8200.
-
- Frederic.
-
- Frederic Hemmer email: hemmer@sun1.cern.ch
- European Laboratory for Particle Physics bitnet: hemmer at cernvm
- Computers and Networks division phone: +41-22-7676104
- CH-1211 Geneva 23 - Switzerland fax: +41-22-7677155
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