[Beowulf] [zfs] Re: [zfs-discuss] Petabyte pool?
jaw171 at pitt.edu
Tue Mar 19 05:47:44 PDT 2013
On 03/18/2013 02:22 PM, Hearns, John wrote:
> We've come close:
> admin at mes-str-imgnx-p1:~$ zpool list
> NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT
> datapool 978T 298T 680T 30% 1.00x ONLINE -
> syspool 278G 104G 174G 37% 1.00x ONLINE -
> Using a Dell R720 head unit, plus a bunch of Dell MD1200 JBODs dual
> pathed to a couple of LSI SAS switches.
> Using Nexenta but no reason you couldn't do this w/ $whatever.
> We did triple parity and our vdev membership is set up such that we can
> lose up to three JBODs and still be functional (one vdev member disk
> per JBOD).
> This is with 3TB NL-SAS drives.
> That's very interesting.
> My kneejerk reaction is always to say 'data does not exist unless you have two copies of it' -
> ie. You should always make sure there are two copies of data on separate media.
> In this setup though it looks like you can achieve substantially that result, without mirroring between
> two completely separate ZFS servers.
> Being able to lose three JBODs without overall losing data is interesting - can we find out more about this setup?
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At my site we tried using GlusterFS to glue together similar Supermicro
boxes full of drives. The design never made it to production as I was
able to cause it to die or become split brained in the dev environment.
You may have better luck than me if you want to try it, just my $0.02 on
a piece of software which purports to do what you are looking at. I
does have a feature which mirrors between two servers as you mentioned
though I doubt it runs on Solaris though (I used RHEL 6 with XFS).
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