From owner-freebsd-hackers Fri Feb 27 16:56:57 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id QAA08119 for freebsd-hackers-outgoing; Fri, 27 Feb 1998 16:56:57 -0800 (PST) (envelope-from owner-freebsd-hackers@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 QAA08112 for ; Fri, 27 Feb 1998 16:56:43 -0800 (PST) (envelope-from shimon@sendero-fxp0.simon-shapiro.org) Received: (qmail 6726 invoked by uid 1000); 28 Feb 1998 01:04:50 -0000 Message-ID: X-Mailer: XFMail 1.3-alpha-022398 [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: <19980228110827.36052@freebie.lemis.com> Date: Fri, 27 Feb 1998 17:04:50 -0800 (PST) Reply-To: shimon@simon-shapiro.org Organization: The Simon Shapiro Foundation From: Simon Shapiro To: Greg Lehey Subject: Re: SCSI Bus redundancy... Cc: hackers@FreeBSD.ORG, blkirk@float.eli.net, jdn@acp.qiv.com, Wilko Bulte Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On 28-Feb-98 Greg Lehey wrote: > On Fri, 27 February 1998 at 15:20:55 -0800, Simon Shapiro wrote: >> >> On 26-Feb-98 Wilko Bulte wrote: >>> As Simon Shapiro wrote... >>>> >>>> On 25-Feb-98 Wilko Bulte wrote: >>>> ... >>>> >>>>> Digital Unix TruClusters do DRD (distributed raw device) now. Things >>>>> like Oracle Parallel Server love this. A cluster filesystem is >>>>> another >>>>> kettle of fish of course. But not impossible, see OpenVMS. >>>> >>>> Stay tuned... FreeBSD will have this functionality too. >>> >>> Next step: a volume manager? >> >> I'll let someone else commit to this one. > > Done. > >> I think Julian's SLICE code has something in that direction. DPT >> supports INCREASING the size of a RAID-5 array by adding drives. > > How can that work? Which? Julian's stuff? I do not clearly remember, but a slice can be re-written and then re-evaluated. Care needs to be excercised in not overlapping, not destroying things, etc. DPT arrays? Simple; you make an ioctl call into the DPT driver, I write a message to the controler, specifying which disk to add to which array, the controller starts a hot rebuild, etc. The details escape me right now, but I belive it is doable. Why would you want to do that? No idea... :-) ---------- Sincerely Yours, Simon Shapiro Shimon@Simon-Shapiro.ORG Voice: 503.799.2313 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message