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List:       linux-raid
Subject:    Re: Drives of same model in RAID 1/10 ?
From:       hahn () physics ! mcmaster ! ca
Date:       2006-07-24 21:54:54
Message-ID: Pine.LNX.4.64.0607241746370.12006 () coffee ! psychology ! mcmaster ! ca
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>> 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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