[7103] in linux-scsi channel archive
Re: scsi driver transfer size and sync mode
daemon@ATHENA.MIT.EDU (Kai Makisara)
Wed Sep 1 16:58:57 1999
Date: Wed, 1 Sep 1999 23:45:13 +0300 (EET DST)
From: Kai Makisara <makisara@metla.fi>
Reply-To: Kai.Makisara@metla.fi
To: Gerard Roudier <groudier@club-internet.fr>
cc: Tony Chung <chungto@ampex.com>, linux-scsi@vger.rutgers.edu
In-Reply-To: <Pine.LNX.3.95.990901221707.951A-100000@localhost>
On Wed, 1 Sep 1999, Gerard Roudier wrote:
>
>
> On Wed, 1 Sep 1999, Tony Chung wrote:
>
> > Kai Makisara wrote:
> >
> > > On Wed, 25 Aug 1999, Tony Chung wrote:
> > >
> > > >
> > > > 1. Can Linux support single scsi transfer of at least 1040384 bytes?
> > >
> > > Yes. I have written tape blocks of at least 1.5 MB.
>
> What is this utter crap that requires a so large IO size, given that
> recent hard disks are able to perform more than 20 MB/second sustaint data
> transfers, using 8K actual IO chunks (and may-be less).
>
For reading there is a clear reason: there are tapes that have been
written with a very large block size. These are common in seismology and
some other fields. This is why the tape driver supports large blocks.
As you say, for writing there must be some other reason than the SCSI
transfer rate.
Kai
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