Date: Tue, 07 Mar 2000 15:58:00 -0700 From: Ken <webweaver@rmci.net> To: Kevin Day <toasty@dragondata.com> Cc: freebsd-isp@FreeBSD.ORG Subject: Re: Vinum Stripe Size Message-ID: <4.2.0.58.20000307155338.00974100@mail.rmci.net> In-Reply-To: <200003072239.QAA93953@celery.dragondata.com> References: <4.2.0.58.20000307152825.00956e20@mail.rmci.net>
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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
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