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

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Message-ID: <20080330042811.GB27330@auslistsprd01.us.dell.com>
Date:	Sat, 29 Mar 2008 23:28:11 -0500
From:	Matt Domsch <Matt_Domsch@...l.com>
To:	Greg Freemyer <greg.freemyer@...il.com>
Cc:	James Bottomley <James.Bottomley@...senpartnership.com>,
	Mark Lord <lkml@....ca>, Jens Axboe <axboe@...nel.dk>,
	Jeff Garzik <jgarzik@...ox.com>, Tejun Heo <htejun@...il.com>,
	Greg KH <gregkh@...e.de>, Linus Torvalds <torvalds@...l.org>,
	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 01:45:35PM -0400, Greg Freemyer wrote:
> I believe GUID Partition Tables (GPTs) are the answer.
> 
> I believe one of the features of GPT is the elimination of the 32-bit
> sector restrictions.
> 
> http://en.wikipedia.org/wiki/GUID_Partition_Table
> 
> Windows VISTA 64-bit supports GPTs on data disks and new Mac OS based
> systems have been using it on internal drives for a couple years at
> least.
> 
> GPTs are part of the Extensible Firmware Interface (EFI), so they
> should be usable for PC bootable disks at some point.  (Maybe now in
> some cases?)
> 
> I'm not sure what the Linux Kernel support is for GPTs.

It has been supported since the first Itanium systems shipped.  It's
the first code I wrote 7+ years before it was really needed. :-)  Most
distributions have it enabled, as do userspace tools like GNU Parted.

-- 
Matt Domsch
Linux Technology Strategist, Dell Office of the CTO
linux.dell.com & www.dell.com/linux
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