On 7/5/2013 7:46 PM, Christoph Anton Mitterer wrote:

On Thu, 2013-07-04 at 20:12 -0500, Stan Hoeppner wrote:

...

btw: It was interesting to see,... that all 3 different drives (from WD,
HGST, Seagate)... exported _exactly_ the same amount of space.

You did state these are all enterprise class drives.

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... I don't leave
hot/warm/cold spares in the chassis.

...

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  This simply degrades performance.

Why should it? If the spare is unused?

The answer is rather obvious.  If spares are in the chassis one has
fewer active array spindles.

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2.  HGST is a brand created due to Western Digital's acquisition of
Hitachi Data System's disk drive unit.

Sure... but I think they still use their own technology/firmware... at
least for now?

For now.

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  The drives are Hitachi's final
production units relabeled with a different name and serial number.
Three years from now when that HGST drive fails, Western Digital will
replace it with a Western Digital produced drive.

Sure about that? Wasn't there some agreement that HGST belongs to WD but
produces independently...?

That wouldn't make sense for either party.  Where did you read this?
Got a link?

and Toshiba got something from the
WD/HGST trade and already announced a 3.5" enterprise disk out of that.

Toshiba has been producing 3.5" enterprise drives for years.  Got a link
showing that Toshiba received technology from the WD/Hitachi acquisition?

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IMO the practical disadvantages of using dissimilar drives outweighs the
theoretical benefits.

So... which are the practical disadvantages?

I already stated many of them.  You don't seem to be following along
very well.

-- 
Stan