Date: Wed, 14 May 2003 17:56:19 +1000 (EST) From: Andy Farkas <andyf@speednet.com.au> To: "Marc G. Fournier" <scrappy@hub.org> Cc: freebsd-scsi@freebsd.org Subject: Re: RAID5 capacities / usable drive space ... Message-ID: <20030514175000.E69707-100000@hewey.af.speednet.com.au> In-Reply-To: <20030513234434.V3557@hub.org>
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On Tue, 13 May 2003, Marc G. Fournier wrote:
> On Wed, 14 May 2003, Greg 'groggy' Lehey wrote:
>
> > Hmm. You know some interesting someones.
>
> Yup ...
>
> > Yes, it doesn't make sense to have a RAID-5 volume with less than three
> > drives, but in degraded mode it'll run with two. Or it should, bar
> > implementation constraints. And theoretically you could hot swap them.
>
> 'K, I'm going to test the 'theory' out tomorrow just to make double sure
> about the 3->2 drive configuration ... since you already know the vinum
> internals, I'm more worried about how hardware RAID will handle things ...
I had a vinum raid-5 volume lose a disk a few months ago. vinum handled it
fine for the couple of weeks while waiting for a replacement (including
reboots).
Adding in the replacement disk is a whole other story. It may well be
worth practicing. Documentation in this area is lacking.
--
:{ andyf@speednet.com.au
Andy Farkas
System Administrator
Speednet Communications
http://www.speednet.com.au/
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