NAS

Jeff Layton jeffrey.b.layton at lmco.com
Fri Jun 28 14:29:22 EDT 2002


Martin Siegert wrote:

> On a related issue:
>
> we are planning to install a relatively large NAS unit (in the 100TB range).
> The question is: is there a limit (and if yes, how large is it?) for the
> largest file system Linux can mount?
> E.g., can I NFS mount a 8TB file system under Linux? (kernel 2.4.18).

AFAIK, the current limit is 2TB for a single filesystem. You can play some
NFS mounting games to get that higher (it's not pretty though). I think
the Raidzone folks have a way to get to 4 TB, but I don't know for sure.
Oh, I forgot, this is for 32-bit stuff. I don't know about 64-bit  boxes.

There are some efforts to break this limit on 32-bit machines, but it's
pretty much confined to 2.5.x kernels (although a gentleman in Japan
working for VA has some patches for a 2.4 kernel). Here are some links:

http://old.lwn.net/2002/0516/a/2tb.php3
http://lwn.net/Articles/3375/

http://old.lwn.net/2002/0516/a/2tb-2.php3
ftp://ftp.valinux.co.jp/pub/people/sasaki/blk64


Good Luck!

Jeff


>
>
> Thanks for any information you may have on that problem.
>
> Cheers,
> Martin
>
> ========================================================================
> Martin Siegert
> Academic Computing Services                        phone: (604) 291-4691
> Simon Fraser University                            fax:   (604) 291-4242
> Burnaby, British Columbia                          email: siegert at sfu.ca
> Canada  V5A 1S6
> ========================================================================
>
> On Fri, Jun 28, 2002 at 01:29:12PM -0400, John Burton wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > Mike,
> >
> > I have two relatively large NAS units (.5TB and 1.5TB). Both use ATA/100
> > drives configured in a RAID 5 array. The large one is a standard product
> > (OpenNAS) from RAIDZONE / Consensys and is used for the datastore for the
> > NASA SABER project (saber.larc.nasa.gov). The smaller one is a homebuilt NAS
> > serving as a backup server for our company.  Basically I bought 2 3Ware
> > hotswap cages (3 ATA/100 drives each and a 3Ware Escalade RAID 5 card (8
> > ATA/100 channels). The 3Ware card is supported under Linux and causes the
> > RAID array to look like a SCSI drive. You can also configure the board to
> > access the drives individually and use software RAID or whatever. We're happy
> > with both setups, but I'll probably go with the 3Ware setup for our next
> > project. I like the 3Ware native linux drivers and the RAID manager support -
> > I don't like "black boxes" and the RAIDZONE unit is more of a black box to me
> > then the homebuilt... Hope this helps!
> >
> > John
> >
> > On Friday 28 June 2002 10:43 am, Mike Davis wrote:
> > > How many beowulfers have implemented or are working towards implementing
> > > gigabit NAS. I have two systems with .5TB and 1TB respectively and they
> > > seem to work ok. What are other people's experiences.
> > >
> > > Mike Davis
> > >
> > > _______________________________________________
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> >
> > - --
> > John Burton, Ph.D.
> > Principal Associate              GATS, Inc.
> > j.c.burton at gats-inc.com          11864 Canon Blvd - Suite 101
> > jcb at visi.net (personal)          Newport News, VA 23606
> > (757) 873-5920 (voice)           (757) 873-5924 (fax)
> >
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