From owner-freebsd-isp Tue Mar 7 14:56:31 2000 Delivered-To: freebsd-isp@freebsd.org Received: from mx20.rmci.net (halcyon.rmci.net [205.162.184.63]) by hub.freebsd.org (Postfix) with SMTP id 4A80A37BFE4 for ; Tue, 7 Mar 2000 14:56:27 -0800 (PST) (envelope-from webweaver@rmci.net) Received: (qmail 2387 invoked from network); 8 Mar 2000 00:56:25 -0000 Received: from usr-boi-101.rmci.net (HELO hobart) (206.159.112.187) by halcyon.rmci.net with SMTP; 8 Mar 2000 00:56:25 -0000 Message-Id: <4.2.0.58.20000307155338.00974100@mail.rmci.net> X-Sender: webweaver@mail.rmci.net X-Mailer: QUALCOMM Windows Eudora Pro Version 4.2.0.58 Date: Tue, 07 Mar 2000 15:58:00 -0700 To: Kevin Day From: Ken Subject: Re: Vinum Stripe Size Cc: freebsd-isp@FreeBSD.ORG In-Reply-To: <200003072239.QAA93953@celery.dragondata.com> References: <4.2.0.58.20000307152825.00956e20@mail.rmci.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Sender: owner-freebsd-isp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org At 04:39 PM 3/7/00 -0600, Kevin Day wrote: > > > > Greets: > > > > Vinum simple config uses 256k stripe sizes. However, the examples in _The > > Complete FBSD_ and Greg's web pages use 512k stripe size. It doesn't > > appear that this will make a whole lot of difference one way or the other, > > but I am curious about what others are using. This application is for > > stripped mirror on four 9GB drives. > > > > Thanks for your output-- Ken > > > >Actually, I discovered that with 4 drives, you're much better off using an >odd stripe size. (not a power of two) This is because of how the cylinder >groups are laid out, they'll all end up on one drive. > >You may want to ask Greg Lehey (grog@lemis.com) for more info about this, as >I can't remember exactly what he came up with for an optimum stripe size. I figured he'd end up seeing this and I didn't want to bug him at his private address;) The docs suggest 256k to 512K. I thing I read somewhere to use 512 with larger drives, but cannot recall precisely where. BTW, this is for a web hosting box. I could probably get by with RAID-1, but figured I might as well go with RAID-10 since I have the drives to spare. Regards, Ken To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message