I am in the process of deciding which SATA-II drives should I choose for an
external RAID system. I heard that it was safer to choose drives from
different manufacturers to reduce the chance of near-simultaneous failure
due to model-specific issues.
Is this so?
It's certainly safer.. whether you think it is worth the trouble is
your call.
it would be great to know the numbers. I WAG that this pretty
theoretical model-specific failure mode is insignificant compared
to environment or wear/load-specific ones. I can imagine the former
was more of a concern in the days of disks on shared buses (SCSI, FC,
even IDE), when a model-specific response to some protocol oddity
might cause group failures.
nowadays, a SATA disk will probably share power, air, vibration with
its peers, and in some sense, IO load. but I suspect there's enough
variance in the latter to make synchronized dying uncommon. at least
short-scale synchrony. vendor would be much less relevant to
power/air/vibration issues.
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