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From: "Frantisek Rysanek" <Frantisek.Rysanek@post.cz>
To: linux-kernel@vger.kernel.org
Subject: Re: block layer / FS question: x86_32bit with LBD, 20 TB RAID volume => funny issues
Date: Mon, 10 Mar 2008 05:32:48 +0100	[thread overview]
Message-ID: <47D4C800.4273.B14F3D3A@Frantisek.Rysanek.post.cz> (raw)
In-Reply-To: <20080309220547.GR155407@sgi.com>

On 9 Mar 2008 at 23:05, David Chinner wrote:
>
> Sure. the largest address space that can be used on a 32bit platform
> with 4k pages is 16TB (2^32 * 2^12 = 2^44 = 16TB). For XFS, that means
> metadata can't be placed higher in the filesystem than 16TB, and seeing
> as we only have a single address space for metadata, the filesystem is
> limited to 16TB. It could be fixed with software changes, but really
> there's no excuse for using x86 given how cheap x86_64 is now..... 
>
[...] 
> 
> Yes, switching to 64 bit machines will fix this problem as the
> address space will now hold 2^64*2^12 bytes.....
> 
wow, thanks for such a precise answer, from such an authoritative 
source :-)

Frank Rysanek


  reply	other threads:[~2008-03-10  4:33 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-06 21:25 Frantisek Rysanek
     [not found] ` <75b66ecd0803061905n5c06663cv2b75659917461199@mail.gmail.com>
2008-03-07  6:10   ` Frantisek Rysanek
2008-03-07  9:30     ` Andi Kleen
2008-03-07 10:48       ` Frantisek Rysanek
2008-03-09  4:26     ` Lee Revell
2008-03-09 22:05 ` David Chinner
2008-03-10  4:32   ` Frantisek Rysanek [this message]
2008-03-10  9:13 Frantisek Rysanek
2008-03-13 10:14 Frantisek Rysanek

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