Date: Wed, 18 Feb 1998 21:46:27 -0800 (PST) From: Simon Shapiro <shimon@simon-shapiro.org> To: Omar Thameen <omar@clifford.inch.com> Cc: freebsd-scsi@FreeBSD.ORG Subject: Re: getting oriented with RAID Message-ID: <XFMail.980218214627.shimon@simon-shapiro.org> In-Reply-To: <19980218233357.20960@clifford.inch.com>
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On 19-Feb-98 Omar Thameen wrote:
> 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.
Yes. I do not remember the details. Shrinking an array is a different
story :-)
>
> 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.
----------
Sincerely Yours,
Simon Shapiro
Shimon@Simon-Shapiro.ORG Voice: 503.799.2313
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