Re: ZFS with Linux: An Open Plea

On Thu, Apr 26, 2007 at 10:21:02PM -0700, Valerie Henson wrote:
On Wed, Apr 18, 2007 at 01:25:19PM -0400, Lennart Sorensen wrote:

Does it matter that google's recent report on disk failures indicated
that SMART never predicted anything useful as far as they could tell?
Certainly none of my drive failures ever had SMART make any kind of
indication that anything was wrong.

I saw that talk, and that's not what I got out of it. They found that
SMART error reports _did_ correlate with drive failure.

In fact, a certain small set of SMART indicators were a very good sign
that a drive would fail.

However, they found that the correlation was not strong enough to make
it economically feasible to replace disks reporting SMART failures,
since something like 70% of disks were still working a year after the
first failure report. Also, they found that some disks failed without
any SMART error reports.

Indeed, SMART registered no counts at all for most failures, so on the
whole, it can't be said that SMART can predict failures.

So: not a good idea to base your backup scheme on SMART warnings, but
not entirely useless.

--
Mathematics is the supreme nostalgia of our time.
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