Al Hopper schrieb:
On Tue, 18 Jul 2006, Daniel Rock wrote:
I think this type of calculation is flawed. Disk failures are rare and
multiple disk failures at the same time are even more rare.
Stop right here! :) If you have a large number of identical disks which
operate in the same environment[1], and possibly the same enclosure, it's
quite likely that you'll see 2 or more disks die within the same,
relatively short, timeframe.
Not my experience. I work and have worked with several disk arrays (EMC, IBM,
Sun, etc.) and the failure rates of individual disks were fairly random.
Also, with todays higher density disk enclosures, a fan failure, which
goes un-noticed for a period of time, is likely to affect more than one
drive - again leading to multiple disks failing in the same general
timeframe.
Then make sure not more than 2 disks of the same raidz2 pack are in the same
airflow path (or equivalent for RAID-1).
Daniel
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