Date: Wed, 18 Dec 1996 15:00:03 -0800 (PST) From: J Wunsch <j@uriah.heep.sax.de> To: freebsd-bugs Subject: Re: misc/2242: mt blocksize 512 in Release 2.1.6 install Message-ID: <199612182300.PAA04837@freefall.freebsd.org>
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The following reply was made to PR misc/2242; it has been noted by GNATS.
From: J Wunsch <j@uriah.heep.sax.de>
To: jhs@freebsd.org
Cc: FreeBSD-gnats-submit@freebsd.org
Subject: Re: misc/2242: mt blocksize 512 in Release 2.1.6 install
Date: Wed, 18 Dec 1996 23:40:24 +0100 (MET)
As jhs@freebsd.org wrote:
> Maybe we could have provision for a command of form
> mt blocksize 512
> in the install ?
There is one. It's in the `options' screen.
The blocksize of 512 is only more optimal than the default for your
Tandberg (and only if you're using QIC-150 cartridges, things are
different for QIC-525 ones). To the contrary, it would really kill
performance (if not even making the installation totally impossible)
for almost all modern drives.
This is merely a problem with the st driver not having a quirk record
for this particular drive, where (almost?) all Tandbergs require the
ST_Q_SNS_HELP quirk flag set in order to work correctly.
Can you please confirm that the following patch obviates the
requirement to do an additional ``mt blocksize 512'' for the TDC3800
and QIC-150 tapes?
Index: sys/scsi/scsiconf.c
===================================================================
RCS file: /home/ncvs/src/sys/scsi/scsiconf.c,v
retrieving revision 1.72
diff -u -u -r1.72 scsiconf.c
--- scsiconf.c 1996/12/14 09:57:04 1.72
+++ scsiconf.c 1996/12/18 22:38:01
@@ -286,6 +286,10 @@
"st", SC_ONE_LU, ST_Q_NEEDS_PAGE_0, mode_tandberg3600
},
{
+ T_SEQUENTIAL, T_SEQUENTIAL, T_REMOV, "TANDBERG", " TDC 3800", "*",
+ "st", SC_ONE_LU, ST_Q_SNS_HLP|ST_Q_NEEDS_PAGE_0, mode_tandberg3600
+ },
+ {
T_SEQUENTIAL, T_SEQUENTIAL, T_REMOV, "TANDBERG", " TDC 42*", "*",
"st", SC_ONE_LU, ST_Q_SNS_HLP|ST_Q_NO_1024, mode_tandberg4200
},
--
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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