RE: RAID arrays with different size disk units?

["Pytel, Alexei" <pytela1@xxxxxxxxxxxxxxxx>]

RAID algorithm requires all disk units in a set to have the same number
of sectors - obviously it means they should be of the same size (but not
necessarily of the same model, I think).

    Best regards,

          Alexei Pytel



> -----Original Message-----
> From: Sclind2@aol.com [SMTP:Sclind2@aol.com]
> Sent: Wednesday, December 16, 1998 11:15 PM
> To:   MIDRANGE-L@midrange.com
> Subject:      RAID arrays with different size disk units?
> 
> 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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