[Gllug] NFS problem

[John Hearns]

On Mon, 2007-10-22 at 20:18 +0100, Nix wrote:
> On 22 Oct 2007, Kostas Georgiou told this:
> > You also risk data corruption with a soft mount
> > http://nfs.sourceforge.net/#faq_e4
> 
> Of course, take that with a pinch of salt, because you *also* risk data
> corruption with any disk medium which isn't at least battery-backed
> RAID, even if the machine as a whole is on a UPS, and how many of us
> have one of those?
Indeed.
We spec UPSes on cluster head nodes and RAID arrays, and batteries in
the controllers.

> In practice if you keep reasonable backups, that sort of disk corruption
> is vanishingly rare.

Sadly, in the era of Tbyte drives, the probability of dual failures
during reconstruction of RAID-5 sets is getting significant

http://www.eweek.com/article2/0%2C1895%2C2168821%2C00.asp

(see the answer to the last question)





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