Date: Sat, 13 Jan 1996 23:33:52 +0100 (MET) From: J Wunsch <j@uriah.heep.sax.de> To: freebsd-hackers@freebsd.org (FreeBSD hackers) Cc: wilko@yedi.iaf.nl (Wilko Bulte) Subject: Re: A few NITS about SCSI Tapes Message-ID: <199601132233.XAA02099@uriah.heep.sax.de> In-Reply-To: <199601131805.TAA00481@yedi.iaf.nl> from "Wilko Bulte" at Jan 13, 96 07:05:12 pm
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As Wilko Bulte wrote:
>
> Sidestepping a bit: will 2.1R mt also set (no)compression on Exabytes
> capable of hardware compress? The &*^*( drive at work is a 8505 and
> my ol' home 8200 does not grok compressed tapes.
Nobody bothered to implement it so far.
Please, try to patch your /usr/share/misc/scsi_modes with:
Index: share_misc/scsi_modes
===================================================================
RCS file: /home/cvs/src/share/misc/scsi_modes,v
retrieving revision 1.3
diff -u -r1.3 scsi_modes
--- scsi_modes 1995/12/28 14:24:08 1.3
+++ scsi_modes 1996/01/13 22:02:18
@@ -229,3 +229,32 @@
{Output Port 3 Channel Selection} t4
{Output Port 3 Volume} i1
}
+
+# Sequential-access Device Configuration Page
+
+0x10 {
+ {Reserved} *t1
+ {CAP} t1
+ {CAF} t1
+ {Active Format} t5
+ {Active Partition} i1
+ {Write Buffer Full Ratio} i1
+ {Read Buffer Empty Ratio} i1
+ {Write Delay Time} i2
+ {DBR} t1
+ {BIS} t1
+ {RSmk} t1
+ {AVC} t1
+ {SOCF} t2
+ {RBO} t1
+ {REW} t1
+ {Gap Size} i1
+ {EOD Defined} t3
+ {EEG} t1
+ {SEW} t1
+ {Reserved} *t3
+ {Buffer Size at Early Warning} i3
+ {Select Data Compression Algorithm} i1
+ {Reserved} *i1
+}
+
...and see if you could edit the ``Select Data Compression Algorithm''
field to ``1'' using:
scsi -f /dev/st0ctl.0 -m 0x10 -e
(Don't worry about the dozens of acronyms. They are taken straight
out of the SCSI-2 document, but you won't care too much anways.)
--
cheers, J"org
joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)
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