Date: Thu, 17 Jul 2003 17:56:06 -0700 From: "Mike Maltese" <mike@pcmedx.com> To: <freebsd-questions@freebsd.org> Subject: vinum and newfs Message-ID: <003f01c34cc7$5e67a700$f4f0a8c0@pcmedx.com>
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What impact do disk block and fragment sizes have on a vinum volume? I've been benchmarking an array of three drives in striped and raid5 configurations with various stripe sizes. I've noticed that I get better results in just about every instance by passing -b 16384 -f 2048 to newfs. This doesn't make sense to me as those are the defaults for newfs if they are not specified, but looking at the disklabel after a newfs, it shows 8192/1024. Should these options really make a performance difference, and if so, how? Thanks, Mike
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