[5230] in linux-scsi channel archive
Re: Linux 4mm SCSI DAT Drive Settings
daemon@ATHENA.MIT.EDU (Steve Austin)
Sun Nov 29 13:20:15 1998
Date: Sun, 29 Nov 1998 17:37:28 +0000 (GMT)
From: Steve Austin <steve@edensfld.demon.co.uk>
To: Michael Meissner <meissner@cygnus.com>
cc: Popov <popov@ix.netcom.com>, Jon Lewis <jlewis@inorganic5.fdt.net>,
Martin Gallant <martyg@wired.ml.org>, amanda-users@amanda.org,
linux-scsi@vger.rutgers.edu
In-Reply-To: <19981129102642.A12803@tiktok.cygnus.com>
On Sun, 29 Nov 1998, Michael Meissner wrote:
> That may be, however I find I can't reliably write 8k blocks on my WangDat 3800
> DDS-2 drive, and read them back on the same drive during my dump cycle (so I
> use 512 byte blocks for the nonce). Also, I believe Linux imposes a limit of
> 32k without modifying the kernel.
>
> --
> Michael Meissner, Cygnus Solutions (Massachusetts office)
The problem may be to do with your SCSI adaptor or the drive itself; I
have been successfully reading and writing 128K blocks on an HP C1599a via
an Adaptec 2940 without difficulty (other than a hardware fault in the
drive itself) and without modifying the 2.0.32 kernel I've been using.
I use large blocks to maximise tape capacity by reducing the number of
interblock gaps and giving the on-drive compression a fair size chunk of
data to compress, which I believe more likely to yield good compression
ratios than small blocks.
--------------------------------------------------------------------
Steve Austin steve@edensfld.demon.co.uk
http://www.edensfld.demon.co.uk for a really bad time.
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