From owner-freebsd-questions Mon Mar 27 22:41: 6 2000 Delivered-To: freebsd-questions@freebsd.org Received: from freebie.lemis.com (freebie.lemis.com [192.109.197.137]) by hub.freebsd.org (Postfix) with ESMTP id DF3EC37B7BF for ; Mon, 27 Mar 2000 22:41:00 -0800 (PST) (envelope-from grog@freebie.lemis.com) Received: (from grog@localhost) by freebie.lemis.com (8.9.3/8.9.0) id QAA16851; Tue, 28 Mar 2000 16:10:42 +0930 (CST) Date: Tue, 28 Mar 2000 16:10:42 +0930 From: Greg Lehey To: Jon Rust Cc: nino@inode.at, freebsd-questions@FreeBSD.ORG Subject: Re: vinum and disk failures - practical experience? (+ more IDE RAID questions) Message-ID: <20000328161042.C16612@freebie.lemis.com> References: <20000325182955.P15889@TK147108.telekabel.at> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0pre2i In-Reply-To: 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 Organization: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-41-739-7062 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Saturday, 25 March 2000 at 15:42:53 -0800, Jon Rust wrote: > At 6:29 PM +0100 3/25/00, Marinos J . Yannikos wrote: >> Does anyone have practical experience with recent versions of vinum and >> actual disk failures, particularly with a RAID 0+1 configuration (or perhaps >> RAID 1 only) and IDE disks? > > I've been through the restore. See my post yesterday regarding steps > to take. My config when I did it was a 1+0 setup, but with SCSI. I > can't imagine the process being any different for IDE. > > > http://x41.deja.com/[ST_rn=ps]/threadmsg_if.xp?thitnum=131&mhitnum=0&CONTEXT=954027657.1712455691 > >> I'm trying to figure out which configurations would give the best data >> resilience with 2-4 IDE disks and vinum's reaction to my first attempts >> at simulating disk failures weren't particularly encouraging. > > Resilience: mirror. Resilience plus performance: 1+0 (if you have at > least 3 drives, preferably more) Remember that striping only wins if you can overlap the transfers to the disks. You can't do that with two disks on a single IDE controller: it performs the transfers one after another. If you want performance on IDE drives, use one controller per drive. Greg -- When replying to this message, please copy the original recipients. 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