Date: Wed, 18 Dec 1996 16:10:01 -0800 (PST) From: "Julian H. Stacey" <jhs@freebsd.org> To: freebsd-bugs Subject: Re: misc/2242: mt blocksize 512 in Release 2.1.6 install Message-ID: <199612190010.QAA14666@freefall.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/
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