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Re: Support for sectorsizes > 4KB ?

To: R.Oehler@GDAmbH.com (Ralf Oehler)
Subject: Re: Support for sectorsizes > 4KB ?
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Date: Wed, 6 Mar 2002 22:53:01 +0000 (GMT)
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,linux-scsi@vger.kernel.org (Scsi)
Fake-Sender: owner-linux-mm@kvack.org
In-Reply-To: <XFMail.20020306084829.R.Oehler@GDAmbH.com> from "Ralf Oehler" at Mar 06, 2002 08:48:29 AM
Original-Recipient: rfc822;linux-mm-archive@humbolt.geo.uu.nl
Sender: Rik van Riel <riel@nl.linux.org>

> In the not-so-far future there will occure MO media on the market with
> 40 to 120 Gigabytes of capacity and sectorsizes of 8 KB and maybe more.
> It's called "UDO" technology.
> 
> Is there any way to support block devices with sectors larger than 4KB =
> ?

The scsi layer itself doesn't mind, but the page caches do. Once your
block size exceeds the page size you hit a wall of memory fragmentation
issues. Given that M/O media is relatively slow I'd be inclined to say
write an sd like driver (smo or similar) which does reblocking and also
knows a bit more about other M/O drive properties.

Alan
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References:
- Support for sectorsizes > 4KB ?
  - From: Ralf Oehler <R.Oehler@GDAmbH.com>

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