Date: Fri, 27 Feb 1998 17:04:50 -0800 (PST) From: Simon Shapiro <shimon@simon-shapiro.org> To: Greg Lehey <grog@lemis.com> Cc: hackers@FreeBSD.ORG, blkirk@float.eli.net, jdn@acp.qiv.com, Wilko Bulte <wilko@yedi.iaf.nl> Subject: Re: SCSI Bus redundancy... Message-ID: <XFMail.980227170450.shimon@simon-shapiro.org> In-Reply-To: <19980228110827.36052@freebie.lemis.com>
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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
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