Date: Mon, 14 May 2001 10:37:28 +0930 From: Greg Lehey <grog@lemis.com> To: Dan Phoenix <dphoenix@bravenet.com> Cc: Scott Mace <smace@intt.org>, FreeBSD Questions <questions@FreeBSD.ORG> Subject: Re: vinum on 2 ide drives? Message-ID: <20010514103728.E88359@wantadilla.lemis.com> In-Reply-To: <Pine.BSO.4.21.0105101410460.10452-100000@gandalf.bravenet.com>; from dphoenix@bravenet.com on Thu, May 10, 2001 at 02:12:26PM -0700 References: <20010510133425.K56501@wantadilla.lemis.com> <Pine.BSO.4.21.0105101410460.10452-100000@gandalf.bravenet.com>
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On Thursday, 10 May 2001 at 14:12:26 -0700, Dan Phoenix wrote: > > > [root@gorbag dphoenix]# rawio -a /dev/vinum/stripe > Random read Sequential read Random write Sequential write > ID K/sec /sec K/sec /sec K/sec /sec K/sec /sec > stripe 2435.2 151 18504.8 1129 1920.9 119 2143.6 131 > [root@gorbag dphoenix]# > [root@gorbag dphoenix]#kldunload vinum.ko > [root@gorbag dphoenix]# rawio -a /dev/ad1s1e > Random read Sequential read Random write Sequential write > ID K/sec /sec K/sec /sec K/sec /sec K/sec /sec > ad1s1e 1543.4 95 1825.9 111 1294.0 80 1193.7 73 > [root@gorbag dphoenix]# This is definitely showing that Vinum far outperforms raw disks, by about the factor I'd expect, except for sequential read, which puzzles me. It looks as if it's hitting the drive cache, but I would expect that to work on raw disk as well. So, why doesn't IOZONE show something similar? I don't know, but IOZONE analyses more than just the storage system performance. Note that, as I said before, single sequential access can look very impressive, but it's not really real-life. > Btw just noticed the -v 1 option from the man page...when i tested it > quicky there really is not a Time field like man page suggests...just > thought I'd let ya know. OK, I'll check that. Thanks for the info. Greg -- When replying to this message, please copy the original recipients. If you don't, I may ignore the reply. For more information, see http://www.lemis.com/questions.html Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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