Re: 3Ware RAID Controlers
From: Kamus of Kadizhar (yan_at_NsOeSiPnAeMr.com)
Date: 08/25/04
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Date: Wed, 25 Aug 2004 15:23:56 -0400
On Wed, 25 Aug 2004 20:34:15 +0200, Leo wrote:
> Hi,
>
> I'm a little bit confused about the 3Ware Raid Controllers. They are said to
> be true hardware based RAID controlers.
> But why does the linux kernel need a driver to handle the controller?
> I thought that with a hardware based RAID controler the operating system
> doesn't even know about the
> existence of the RAID - it thinks of one big HD. Is this correct?
Not necessarily. Raid controllers can have functionality beyond normal
drives - hot swapping, error diagnostics, etc. So the driver has to be
able to handle all those things, so you can
a) be told a drive failed
b) replace failed drive
c) tell controller to rebuild on now-replaced drive
When you do this, the function of the drives may change - a standby drive
is now an active drive, and the drive you put in is now standby....
So the driver has to handle all of these things and interface with you in
user space somehow.
(I don't know if this pertains to 3Ware controllers, since I don't use
them, but it's my experience with other RAID controllers.)
--Kamus
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