On 12/02/2005 01:57 PM, Nicholas Leippe wrote:
If you consider as I do, that the first drive failure is a given,
then the odds of failure is magnitudes larger--back up to the same order
of magnitude as a single drive failing.
This makes the relative differences in failure odds become significant,
especially when you consider how the odds increase with additional capacity.
What you say is true about the probability increasing with a failed
drive. The probability of two drives failing at once is very small, but
the probability of a second drive failure after the first has occurred
is much larger. RAID 10 can, in most cases, survive multiple failures,
while a RAID 5 cannot. So our lesson for today, kids, is "Always fix
your degraded array as quickly as possible."
As a related side note, hot spares are a wonderful thing...
--Tyler
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