Re: RAID arrays with different size disk units?

While it is wastefull you can add drives that are larger than the drives in the 
array.  They will be
used as if they are the same size.  Thus a 4gb drive in your array would act 
like a 2gb unit.  All
drives in each set Must be of the same logical size.

I would recommend adding 4-4gb units and starting a new set.  Most controllers 
can do up to three
sets.

-- 
Larry Bolhuis         |
Arbor Solutions, Inc  | Two rules to success in life:
(616) 451-2500        | 1. Never tell people everything you know.
lbolhui@ibm.net       |


Sclind2@aol.com wrote:
> 
> Are there any circumstances where disk units of a different size can be added
> to an existing RAID array?  The Backup and Recovery manual states that you
> need 4 disk units of the same size to start RAID protection, and that
> additional units can be added later.  But it is unclear whether these need to
> be the same size units.
> 
> I currently have one RAID array that isn't full; it has four 2gb drives (raw
> size).  Can I add 4gb (or larger) disk units into this array?  We have added
> disk units into an existing array in the past, but they have always been of
> the same size.
> 
> If this can be done, what is the resulting usable size of the new units?  In
> the above case, establishing RAID protection ended up leaving us with four
> units of 1475mb each.  (I.E., 25% was used on each of the four units).
> 
> Scott Lindstrom
> Zenith Electronics Corp
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