From owner-freebsd-scsi Wed Feb 18 21:38:17 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id VAA08683 for freebsd-scsi-outgoing; Wed, 18 Feb 1998 21:38:17 -0800 (PST) (envelope-from owner-freebsd-scsi@FreeBSD.ORG) Received: from sendero.simon-shapiro.org (sendero-fxp0.Simon-Shapiro.ORG [206.190.148.34]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id VAA08676 for ; Wed, 18 Feb 1998 21:38:14 -0800 (PST) (envelope-from shimon@sendero-fxp0.simon-shapiro.org) Received: (qmail 12043 invoked by uid 1000); 19 Feb 1998 05:46:27 -0000 Message-ID: X-Mailer: XFMail 1.3-alpha-021598 [p0] on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: <19980218233357.20960@clifford.inch.com> Date: Wed, 18 Feb 1998 21:46:27 -0800 (PST) Reply-To: shimon@simon-shapiro.org Organization: The Simon Shapiro Foundation From: Simon Shapiro To: Omar Thameen Subject: Re: getting oriented with RAID Cc: freebsd-scsi@FreeBSD.ORG Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message