linux-kernel - Re: block layer / FS question: x86_32bit with LBD, 20 TB RAID volume => funny issues

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Message-ID: <47D4C800.4273.B14F3D3A@Frantisek.Rysanek.post.cz>
Date:	Mon, 10 Mar 2008 05:32:48 +0100
From:	"Frantisek Rysanek" <Frantisek.Rysanek@...t.cz>
To:	linux-kernel@...r.kernel.org
Subject: Re: block layer / FS question: x86_32bit with LBD, 20 TB RAID volume => funny issues

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

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