Re: RAID: identical disks?
- From: "Rod Speed" <rod_speed@xxxxxxxxx>
- Date: Tue, 29 Nov 2005 05:33:30 +1100
J. Clarke <jclarke.usenet@xxxxxxxxxxxxxxxx> wrote:
> void@xxxxxxxxxxx wrote:
>
>> I've read that it's best to set up RAID with identical disks (same
>> brand and
>> model). I've got a Samsung SP1213N hard drive which I got 21 months
>> ago, and
>> now I want to set up RAID 1 on my machine. So I'll need to get
>> another Samsung SP1213N. But I know that sometimes manufacturers
>> will make slight changes to hardware and still keep the same model
>> number. I don't know if Samsung has done anything to this
>> particular drive in the 21 months since I bought mine, so hopefully
>> buying a recent one will be OK to set up a RAID mirror.
>
> In practice, as long as the secondary is of the same capacity or
> higher than the primary, and of about the same performance, a RAID1
> will work fine. In fact there is a school of thought that the two
> disks should be _different_ brands and/or models on the theory that
> if they are they same they might be so closely matched that they both
> might fail at the same time or close enough to it that you don't have
> time to rebuild the mirror.
>
> Having seen four Japanese-made light bulbs installed at the same time
> fail within four hours of each other a year and a half later, I am
> not going to denigrate this notion, although I don't consider such
> failure to be exceedingly likely.
Yeah, its one approach, particularly if something goes
out of spec like the cooling or power supply etc.
.
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