From owner-freebsd-questions Tue May 8 17:31:40 2001 Delivered-To: freebsd-questions@freebsd.org Received: from wantadilla.lemis.com (wantadilla.lemis.com [192.109.197.80]) by hub.freebsd.org (Postfix) with ESMTP id 75F5037B422 for ; Tue, 8 May 2001 17:31:36 -0700 (PDT) (envelope-from grog@lemis.com) Received: by wantadilla.lemis.com (Postfix, from userid 1004) id 196366ACBE; Wed, 9 May 2001 10:01:35 +0930 (CST) Date: Wed, 9 May 2001 10:01:35 +0930 From: Greg Lehey To: Douglas Egan Cc: dochawk@psu.edu, questions@freebsd.org Subject: Re: Raid Message-ID: <20010509100135.N68969@wantadilla.lemis.com> References: <200105081646.f48GkIx16552@fac13.ds.psu.edu> <3AF8375C.DF2925C2@calcon.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <3AF8375C.DF2925C2@calcon.net>; from degan@calcon.net on Tue, May 08, 2001 at 01:13:48PM -0500 Organization: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-418-838-708 WWW-Home-Page: http://www.lemis.com/~grog X-PGP-Fingerprint: 6B 7B C3 8C 61 CD 54 AF 13 24 52 F8 6D A4 95 EF Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Tuesday, 8 May 2001 at 13:13:48 -0500, Douglas Egan wrote: > dochawk@psu.edu wrote: > >>> Which is why RAID 1 is superior, IMHO. Drives are bloody cheap today. >>> Your data probably not (else you wouldn't be using RAID in the first >>> place) so make it use the best. >> >> my understanding is that you can have a hot standby on RAID 5, so that >> if a disk fails, it is replaced with the standby, leaving you protected >> whileyou replace the offending drive. But don't hold me to this; I >> can't back it up (but we want to set up our new server like this). > > If vinum works like Linux raid, or NetBSD's RAIDFrame, when the hot > standby is added into the array, reconstuction of the array starts > taking place on the spare. This can take a while and I believe if > you lose another drive during this reconstruction phase, the array > is gone. I don't run with a hot standby so I don't know if > reconstruction is automatic when a failure occurs or if you have to > manually kick it off. In Vinum, it's manual. There are a number of reasons why automatic rebuild isn't always desirable, but I'm planning to implement it as an option. > I have been using the RAIDFrame raid5 under NetBSD for about 6 > months now and it has worked great. I scrapped Linux raid at that > time. I didn't like having to add patches at each kernel rev. > > I am going to bring up a FreeBSD system with vinum raid5 and see > just how it compares to the RAIDFrame. I'd be very interested to see the results. As far as I know, nobody has done this yet. I'd be particularly interested in a comparison of the performance. Greg -- When replying to this message, please copy the original recipients. If you don't, I may ignore the reply. For more information, see http://www.lemis.com/questions.html Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message