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Re: re[2]: Work Items

To: Greg Freemyer <freemyer@xxxxxxxxxxxxxxxxx>
Subject: Re: re[2]: Work Items
From: Steve Lord <lord@xxxxxxx>
Date: 15 Oct 2002 11:25:17 -0500
Cc: linux-xfs@xxxxxxxxxxx
In-reply-to: <20021015161258.BFQR28929.imf03bis.bellsouth.net@Mother2>
References: <20021015161258.BFQR28929.imf03bis.bellsouth.net@Mother2>
Sender: linux-xfs-bounce@xxxxxxxxxxx
On Tue, 2002-10-15 at 11:11, Greg Freemyer wrote:
>  >>  In order for xfs to function beyond the 2 Tbyte limit, all we need
>  >>  to do is enable large filesystem support again in XFS. This is a
>  >>  one character change. In xfs_types.h define XFS_BIG_FILESYSTEMS to
>  >>  1 instead of zero.
> 
> Assuming this is done before the 2.6.x kernels are released, what will the 
> max. 2.6.x XFS-Linux filesystem be?
> 

It becomes a function of pagesize and the size of the page->index field,
metadata is cached in an address space, so the size of a filesystem is
governed by the amount of space which can fit in one of these.

So page index is a long, on ia32 we have 4K pages, I think this gets
us to 16 Tbytes.

Steve

-- 

Steve Lord                                      voice: +1-651-683-3511
Principal Engineer, Filesystem Software         email: lord@xxxxxxx


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