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Date: Wed, 18 Dec 1996 16:10:01 -0800 (PST)
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From: "Julian H. Stacey" <jhs@freebsd.org>
Subject: Re: misc/2242: mt blocksize 512 in Release 2.1.6 install 
Reply-To: "Julian H. Stacey" <jhs@freebsd.org>
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The following reply was made to PR misc/2242; it has been noted by GNATS.

From: "Julian H. Stacey" <jhs@freebsd.org>
To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch)
Cc: FreeBSD-gnats-submit@freebsd.org
Subject: Re: misc/2242: mt blocksize 512 in Release 2.1.6 install 
Date: Thu, 19 Dec 1996 01:07:48 +0100

 Hi, Reference:
 > From: J Wunsch <j@uriah.heep.sax.de> 
 > Reply-to: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) 
 > Subject: Re: misc/2242: mt blocksize 512 in Release 2.1.6 install 
 > Date: Wed, 18 Dec 1996 23:40:24 +0100 (MET) 
 > Message-id: <199612182240.XAA24266@uriah.heep.sax.de> 
 >
 > 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?
 
 I'll build a kernel to test it,
 but I recall building a release flop is a horror story that needs CVS ?
 in which case I may have trouble 
 creating a release type boot flop , particularly as I no longer have
 a working cvs tree as its outgrown my dedicated 300 M drive ,
 
 I'll get back to you Joerg, thanks.
 
 > 
 > 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_tandberg3
 - 600
 > +	},
 > +	{
 >  		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. ;-)
 > 
 > 
 Julian
 --
 Julian H. Stacey	jhs@freebsd.org  	http://www.freebsd.org/~jhs/