[Discuss] Adventures in N40L Land

[Jerry Feldman]

On 02/14/2012 10:28 AM, Richard Pieri wrote:
> On 2/14/2012 3:07 AM, Tom Metro wrote:
> > You're referring to the Western Digital "Advance Format" drives? I
> don't
> > have any direct experience with these, but yeah, I could see that is
> > potentially a problem. I'm not sure if it is something you need to
> > account for at the RAID driver level (it has a default chunk size of
> > 64K, which should be aligned with either block size), the partitioning,
> > or just the file system.
>
> Yeah, them.  I probably could have figured out how to mix the Hitachi
> and WD disks, but I really, really didn't want to fight it out or even
> approach that situation.
>
One issue with RAID is that you don't want to mix geometries. I like to
keep 2 different makes of drives in my RAID because of different MTBFs.
We've had simultaneous drive failure in the BLU servers, With 2
different makes (or at least 2 different lot numbers) the chances of
simultaneous disk failure is lower.

-- 
Jerry Feldman <gaf at blu.org>
Boston Linux and Unix
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