max filesystem size - nfs imposed limit?

max filesystem size - nfs imposed limit?

[Dan Stromberg]

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We need to set up a multiterrabyte filesystem (probably 30T), and NFS
export it.

Does linux nfs impose a maximum filesystem size?  Or is that strictly a
matter of the filesystem type being exported (ext3, xfs, lustre, gfs,
whatever)?  Does it matter if you're using nfs v2/v3/v4?  Does the
kernel version matter?  How about 32 bit vs 64 bit platforms (especially
interested in whether an opteron or linux ppc would help)?

Is linux NFS on 64 bit platforms stable?

Sorry if these questions have been asked before.  I didn't have much
luck locating answers (which might make a nice entry in a FAQ :), which
I'd be willing to take a stab at composing the entry for) by googling
and searching the list archives.

-- 
Dan Stromberg DCS/NACS/UCI <strombrg@dcs.nac.uci.edu>


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Re: max filesystem size - nfs imposed limit?

[Greg Banks]

On Wed, May 19, 2004 at 04:44:11PM -0700, Dan Stromberg wrote:
> 
> We need to set up a multiterrabyte filesystem (probably 30T), and NFS
> export it.
> 
> Does linux nfs impose a maximum filesystem size? 

Yes, but if you use v3 or v4 it's larger than you care about.

> Or is that strictly a
> matter of the filesystem type being exported (ext3, xfs, lustre, gfs,
> whatever)?

That also matters.  You need to have a server OS which supports
large block devices, and the filesystem needs to support it also.
Obviously, XFS does (except it can't export more than 2^32 inodes
currently).

> Does it matter if you're using nfs v2/v3/v4? 

Yes.  Don't use NFSv2.

> Does the
> kernel version matter?  How about 32 bit vs 64 bit platforms (especially
> interested in whether an opteron or linux ppc would help)?

This comes down to large block device support.  You need to use 2.6
or apply the LBD patch to 2.4.

> Is linux NFS on 64 bit platforms stable?

Yes.  Our sales staff will be happy to sell you one, and as many TB
of disk as you can afford.

Greg.
-- 
Greg Banks, R&D Software Engineer, SGI Australian Software Group.
I don't speak for SGI.


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