[nylug-talk] How to set up Raid 1 on Ubuntu, Or Linux in gerneral

[sixtyfourbeets]

On Fri, Jun 01, 2007 at 02:08:24PM -0400, sixtyfourbeets wrote:
>* If you're buying the same model drive from the same manufacturer of
*>* the same capacity, then you're getting the same quality with some
*>* different silicon screwed on to it.
*>*
*>* -Peter
*>*
*>* Convention dictates that when constructing
*>* a true SAN one should buy drives from different
*>* manufacturers.
*
No it doesn't. Different drives have different geometries sizes,
specs, etc.
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So what?  As long as you buy a drive with the same capacity the SAN/RAID
hardware/software determines how to place that data on the drive.

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Convention is to get a lot of drives, burn them in, and
make sure they're under warranty. Real SANs are bought from vendors
that have done the QA and track the failure rates in the parts they
provide and they have the relationship to turn around a container full
of disks and get a new container if they find that N% have failed when
only Y% should have.
------------------------


>* Doing so addresses
*>* the concern that a particular drive will not be the same
*>* as the next drive in the SAN.
*
You are contradicting yourself here. Can you clarify this?
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Putting in HD's from different manufacturers decreases the likelihood
that multiple drives will fail from a similar defect or when
it has gone past its MTBF.

>* The reasoning behind that
*>* is if drives are from different manufactures chances are
*>* less likely that the drives will fail in a similar fashion
*>* in a reasonably short time span.
*
It just makes it more likely that you'll have to deal with a greater
number of different failures.
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It usually doesnt matter what kind of failure a drive suffers from to the person
replacing the drive.

Steve M