From owner-freebsd-scsi Wed Feb 18 20:39:42 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id UAA01316 for freebsd-scsi-outgoing; Wed, 18 Feb 1998 20:39:42 -0800 (PST) (envelope-from owner-freebsd-scsi@FreeBSD.ORG) Received: from clifford.inch.com (omar@clifford.inch.com [207.240.140.163]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id UAA01279 for ; Wed, 18 Feb 1998 20:39:32 -0800 (PST) (envelope-from omar@clifford.inch.com) Received: (from omar@localhost) by clifford.inch.com (8.8.5/8.8.5) id XAA29651; Wed, 18 Feb 1998 23:33:58 -0500 Message-ID: <19980218233357.20960@clifford.inch.com> Date: Wed, 18 Feb 1998 23:33:57 -0500 From: Omar Thameen To: shimon@simon-shapiro.org Cc: freebsd-scsi@FreeBSD.ORG Subject: Re: getting oriented with RAID References: <19980217150134.49019@clifford.inch.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.81 In-Reply-To: ; from Simon Shapiro on Wed, Feb 18, 1998 at 12:02:30AM -0800 Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org 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. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message