RE: Adding a disk to a RAID array

Liz,  I never considered that you were running a hardware array and not a
Linux array.  I guess I need to freshen up the coffee before I respond next
time.

I concur with Bill.  If you can make another array on your controller and
dedicate that to your big data stuff all the better.  Drives are cheap
today.  Also no need to limit it just to SCSI if you need big storage space
on a budget.  Get a couple of BIG IDE drives, put each one on a SEPARATE
IDE channel, and allow Linux to provide a software RAID solution.  You
should be able to add 180GB for a few hundred $$ and use the on-board IDE
channels.

stew



[email protected] wrote:
> You've got a couple of issues here.
>
> First, adding a drive to a controller and adding a drive to an array
> are two different things.
>
> Some RAID controllers allow you to add a new drive and have that
> drive become part of an existing array where "array" is their
> definition and not necessarily something useable by an O/S without
> additional work. Others don't - you have to destroy the array and
> rebuild it with the added capacity to realize a larger array.
>
> Every RAID controller I know if will let you build more than one
> array per the controller. i.e. 3 existing drives in the first array,
> add 3 more drives and create a new array from them. The controller
> now has 2 arrays. Via Linux, format the second "array" and use the
> normal mount point technique to mount this capacity where ever you
> need it.
>
> Adding one drive to an array controller is counterintuitive to me
> unless that controller has the smarts to dynamically add that
> capacity into an existing array or if it is willing to run that drive
> as a non array entity in which case you can then just add that lonely
> drive to a mount point and it has no RAID capability.
>
> Bill Gradwohl
> [email protected]
> (817) 224-9400 x211
> www.ycc.com
>
>
>
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