Re: [RFC 0/13] extents and 48bit ext3

From: Valdis . Kletnieks
Date: Thu Jun 08 2006 - 22:40:02 EST

On Thu, 08 Jun 2006 18:20:54 PDT, Mingming Cao said:
> Current ext3 filesystem is limited to 8TB(4k block size), this is
> practically not enough for the increasing need of bigger storage as
> disks in a few years (or even now).
> To address this need, there are co-effort from RedHat, ClusterFS, IBM
> and BULL to move ext3 from 32 bit filesystem to 48 bit filesystem,
> expanding ext3 filesystem limit from 8TB today to 1024 PB. The 48 bit
> ext3 is build on top of extent map changes for ext3, originally from
> Alex Tomas. In short, the new ext3 on-disk extents format is:

which implies matching changes to mkfs.ext2 and possibly mount..

> Appreciate any comments and feedbacks!

Somebody else was recently discussing a set of patches to ext3 for
extents+delalloc+mballoc patches - is this work compatible with that?

Also, a pointer to the matching userspace patches would help anybody
who's gung-ho enough to test the code....

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