Date: Sun, 03 Feb 2002 02:39:12 -0800 From: Tim Baird <tim@techvalley.ca> To: Greg Lehey <grog@FreeBSD.org> Cc: questions@FreeBSD.org Subject: Re: Vinum strangeness Message-ID: <4.2.0.58.20020203022911.009418b0@pop3.norton.antivirus> In-Reply-To: <20020203123017.I2189@wantadilla.lemis.com> References: <4.2.0.58.20020202165607.009dccb0@pop3.norton.antivirus> <4.2.0.58.20020202030832.0094a820@pop3.norton.antivirus> <4.2.0.58.20020202030832.0094a820@pop3.norton.antivirus> <4.2.0.58.20020202165607.009dccb0@pop3.norton.antivirus>
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At 12:30 PM 03/02/02 +1030, Greg Lehey wrote: >On Saturday, 2 February 2002 at 17:04:28 -0800, Tim Baird wrote: > > As per your request for a little more info.... > > on-disk config... > > > > IN VINOvinum1H<*L<V}volume usr state up > >Hmm. That "vinum1" is a drive name. That's why it couldn't rename it >alpha, but I don't understand that. I'll try to reproduce that one. >Try copying zeros to the disk: > > # dd if=/dev/zero of=/dev/ad0s1f count=2 seek=8 > >That should transfer two blocks, and after that you should have no >information from the output dump. Check that I'm right with the >output device name. That seemed to do it.... BTW, I am attempting some crude performance tests...basically read/write speeds using the 4.5 source distribution as a bundle of files to push around. So far it is about 20% faster when doing a cp from one directory to another on the non-vinum partition than the equivalent cp between directories on the vinum partition. I have softupdates enabled on both partitions. There is one fly in the ointment in that the smaller drive (one of the subdisks of 2G) is a UDMA 33 and the other (which holds 1 2G subdisk and the remaining non-vinum partions) is a UDMA 66. The improved bus transfer rate will still help vinum I suppose when using the faster subdisk.... The bottom line is, am I justified in expecting to see a higher throughput on the vinum area than the non-vinum area or are there simply too many other latency factors that I am ignoring? vinum list is.... drives: D alpha State: up Device /dev/ad0s1f Avail: 0/2014 MB (0%) D beta State: up Device /dev/ad2s1e Avail: 0/2014 MB (0%) 1 volumes: V omega State: up Plexes: 1 Size: 4027 MB 1 plexes: P omega.p0 S State: up Subdisks: 2 Size: 4027 MB 2 subdisks: S omega.p0.s0 State: up PO: 0 B Size: 2013 MB S omega.p0.s1 State: up PO: 500 kB Size: 2013 MB To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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