Date: Thu, 3 May 2001 11:04:59 +0930 From: Greg Lehey <grog@lemis.com> To: Douglas Egan <degan@calcon.net> Cc: Brian Skrab <bgs@pinky.us.net>, freebsd-questions@FreeBSD.ORG Subject: Re: Vinum & FreeBDS 4.3-stable??? Message-ID: <20010503110459.O72846@wantadilla.lemis.com> In-Reply-To: <3AF0B492.8AB9DCCB@calcon.net>; from degan@calcon.net on Wed, May 02, 2001 at 08:29:55PM -0500 References: <Pine.BSF.4.32.0105021459520.326-100000@pinky.us.net> <20010503084922.B72846@wantadilla.lemis.com> <3AF0B492.8AB9DCCB@calcon.net>
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On Wednesday, 2 May 2001 at 20:29:55 -0500, Douglas Egan wrote: > Does anyone have any comparisons or comments on RAID5 implemented > with vinum and FreeBSD vs RAID5 implemented with RAIDFrame and > NetBSD? No direct comparisons that I know of. I read a thread on the NetBSD mailing lists a day or two ago which suggested that it's possible to (mis)configure RAIDFrame to perform very, very badly. I don't know of a way to do this with Vinum. In general, Vinum has a reputation for very good performance. > My nfs/smb server is currently running NetBSD 1.5 with RAID5 using > RAIDFrame. When I configured that system, I was unaware of vinum's > support of RAID5. > > Can you comment on vinums stability with RAID5? I have currently > configured a 4 disk array; 3 15gig ATA ultra66 and 1 18gig scsi. > This is split up into 2 22gig arrays with no hot-spares. So far the > RAIDFrame has performed admirably. We have had some problems with RAID-5 stability in the past. The only current issue is with memory mapped data: if the data changes while it's being written, there's a potential for data corruption. This is a theoretical issue which I'm currently considering: I don't know if it's possible for the data to change while it's being written. You wrote this in reply to a message from Brian Skrab reporting extreme data corruption. I don't know what the problem here is, but it's the first report of anything like this that I've seen. 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
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