RE: ACL Support

["Mike Young" <myoung@wildernessvoice.com>]

I should be able to get around the 2TB limit using LBD support on the 2.4
kernel.

Other than that, the 16TB limit shouldn't be a problem either since I can't
get beyond that with the current VFS limit of 32-bit inodes on Xeon
platforms.  With that, I can only go 2^32*4k block size, which is 16TB.

Hmmm.  Reiserfs is looking pretty good for me.

Thanks,

Mike

-----Original Message-----
From: Jeff Mahoney [mailto:jeffm@suse.com] 
Sent: Thursday, April 01, 2004 1:49 PM
To: Mike Young
Cc: reiserfs-list@namesys.com
Subject: Re: ACL Support

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Mike Young wrote:
| Wow Jeff!  That's a great explanation and very helpful too.  Can you
answer
| a couple more questions for me on the v3.x reiserfs?  I'm trying to
| understand the limits right now.  For example, how big of a volume can I
| support?  How large of a file?  And how many files?
|
| I actually have a problem in that I've got files that are 2TB in size--
| nothing bigger, though.

Mike -

The on-disk format for ReiserFS v3 defines the maximum filesystem size
as 2^32 * blocksize, which is currently limited by the size of a page on
the system. So, 16 TB assuming a 4k blocksize. The maximum file size is
2^61-1bytes, but is obviously limited by the maximum size of the
filesystem. The maximum number of files is 2^32.

If you're using a 2.4 kernel, you're not going to be able to handle that
workload using any filesystem, since block devices are limited to 2^32 *
512 bytes = 2 TB. This, in turn, limits all filesystems to 2 TB in size.

Using the 2.6 kernel, the block device limits have been raised, so
ReiserFS can use its maximum capacity.

- -Jeff

- --
Jeff Mahoney
SuSE Labs
jeffm@suse.com
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