linux-kernel - Re: What to do about the 2TB limit on HDIO

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Message-ID: <87f94c370803250651k31000f99ia3e3dc98928590d4@mail.gmail.com>
Date:	Tue, 25 Mar 2008 09:51:04 -0400
From:	"Greg Freemyer" <greg.freemyer@...il.com>
To:	"Mark Lord" <lkml@....ca>
Cc:	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Jens Axboe" <axboe@...nel.dk>, "Jeff Garzik" <jgarzik@...ox.com>,
	"Tejun Heo" <htejun@...il.com>, "Greg KH l" <gregkh@...e.de>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>,
	"IDE/ATA development list" <linux-ide@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>
Subject: Re: What to do about the 2TB limit on HDIO_GETGEO ?

On Tue, Mar 25, 2008 at 9:34 AM, Mark Lord <lkml@....ca> wrote:
> Linus Torvalds wrote:
>
> >
>  > On Mon, 24 Mar 2008, Mark Lord wrote:
>  >> The return value uses "unsigned long",
>  >> which on a 32-bit system limits drive offsets to 2TB.
>  >
>  > One relevant question is: does anybody seriously care about the
>  > combination of "32 bit" and "huge modern drives" any more?
>  >
>  > Sure, we can add a 64-bit version that ends up being used only on 32-bit
>  > systems, but quite frankly, I think the solution here is to just ignore
>  > the issue and see if anybody really even cares.
>  >
>  > Because quite frankly, the kind of people who buy modern 2TB drives
>  > generally don't then couple them to CPU's that are five+ years old.

We provide data services to our clients.  We are already seeing USB
enclosures routinely provided to us by our clients with 1TB.  1.5TB on
occasion.  2TB usb enclosures can't be far behind.

For usb a bigger factor than anything is when will MS offer
compatibility/supportfor 2TB+ drives.  As soon as they become readily
supported in MS, our clients will start buying them and filling them
up and we will need to be able to access them from all of our systems.
(old and new).

Greg
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