Chris Mason wrote:
On Wed, 2008-10-22 at 14:27 +0200, Stephan von Krawczynski wrote:
On Tue, 21 Oct 2008 13:31:37 -0400
Ric Wheeler <[EMAIL PROTECTED]> wrote:
[...]
If you have remapped a big chunk of the sectors (say more than 10%), you
should grab the data off the disk asap and replace it. Worry less about
errors during read, writes indicate more serious errors.
Ok, now for the bad news: money is invented.
If you replace a disk before real failure you won't get replacement from the
manufacturer. That may sound irrelevant to someone handling 5 disks, but is
significant if handling 500 or more. The replacement rate is indeed much
higher than people think from their home pcs.
Hardware vendors already do replace disks based on policies defined by
their own array hardware. These are already predictive.
-chris
One key is not to replace the drives too early - you often can recover
significant amounts of data from a drive that is on its last legs. This
can be useful even in RAID rebuilds since with today's enormous drive
capacities, you might hit a latent error during the rebuild on one of
the presumed healthy drives.
Of course, if you don't have a spare drive in your configuration, this
is not practical...
ric
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