From owner-freebsd-questions Thu Feb 10 14:14:15 2000 Delivered-To: freebsd-questions@freebsd.org Received: from vcnet.com (mail.vcnet.com [209.239.239.15]) by builder.freebsd.org (Postfix) with SMTP id A0FAB45F8 for ; Thu, 10 Feb 2000 14:13:52 -0800 (PST) Received: (qmail 65353 invoked from network); 10 Feb 2000 22:13:36 -0000 Received: from joff.vc.net (HELO ?209.239.239.22?) (209.239.239.22) by mail.vcnet.com with SMTP; 10 Feb 2000 22:13:36 -0000 Mime-Version: 1.0 Message-Id: In-Reply-To: <0ea901bf73fa$65c76d90$1e80000a@avantgo.com> References: <0ea901bf73fa$65c76d90$1e80000a@avantgo.com> Date: Thu, 10 Feb 2000 14:13:37 -0800 To: From: Jon Rust Subject: Re: Vinum questions Content-Type: text/plain; charset="us-ascii" ; format="flowed" Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Thanks for your input. I'm leaning toward RAID 0+1. But... I built a RAID5 volume with the 4 drives as a test. newfs took a long time, longer than I thought, so I decided to run some benchmarks. iozone reported 2.7MBps. Seems kinda low. Looking through the archives, I noticed Mr Lehey developed his own benchmark proggy called rawio: sudo rawio -a /dev/vinum/webr5 Doh! I forgot to run it on the raw device. Hit ctrl-c... bad plan. The whole machine locked up. Even ctrl-alt-del wouldn't do anything. Is this a problem with rawio, vinum, or vinum RAID5? Doesn't seem like an interrupt signal should cause this type of problem. jon At 11:09 AM -0800 2/10/00, Scott Hess wrote: >"Jon Rust" >> My 2 choices: >> >> 1) Stripe and mirror. Gives 18G of storage, and best performance >> that still has protection against drive failure. Not the most >> efficient use of my drives, however. >> >> 2) RAID-5 all 4 of the drives in one volume. 27G of storage. Decent >> performance. But... stability of RAID-5 in vinum? > >Make sure that RAID5 still meets your performance needs when rebuilding a >drive. When we were deciding between RAID5 and RAID0+1 (on a hardware >SCSI-SCSI controller), most of the performance tests came out reasonably >close to each other - except when rebuilding a drive. There, RAID0+1 took >a relatively minor hit, but RAID5 dropped our tps to 1/4 of the normal >amount, meaning we couldn't rebuild a drive during peak usage. > >Later, >scott > > > > >To Unsubscribe: send mail to majordomo@FreeBSD.org >with "unsubscribe freebsd-questions" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message