Date: Wed, 18 Feb 1998 23:33:57 -0500 From: Omar Thameen <omar@clifford.inch.com> To: shimon@simon-shapiro.org Cc: freebsd-scsi@FreeBSD.ORG Subject: Re: getting oriented with RAID Message-ID: <19980218233357.20960@clifford.inch.com> In-Reply-To: <XFMail.980218000230.shimon@simon-shapiro.org>; from Simon Shapiro on Wed, Feb 18, 1998 at 12:02:30AM -0800 References: <19980217150134.49019@clifford.inch.com> <XFMail.980218000230.shimon@simon-shapiro.org>
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Thank you for this excellent information. One more question:
After you've created RAID arrays with DPT, is it possible to
later "grow the array" by adding a drive if you need more space?
I'm guessing it might be possible if you've set up RAID-5, but not
with 0 or 1.
Omar
On Wed, Feb 18, 1998 at 12:02:30AM -0800, Simon Shapiro wrote:
>
> Let me clarify this a bit;
>
> DPT always creates RAID-5 arrays by using the firmware on the HBA, and
> these arrays are confined to one controller (i.e. no more than 7-45 drives,
> depending on the controller and options).
>
> RAID-0 (striping) and RAID-1 (mirroring can be created as either firmware
> controlled arrays (run dptmggr with /fw0 option), or as in-O/S driver code.
>
> Now, with the in-kernel RAID-{0,1} you can even create RAID-0 arrays that
> are composed of other, redundant arrays.
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