Date: Thu, 10 May 2001 14:12:26 -0700 (PDT) From: Dan Phoenix <dphoenix@bravenet.com> To: Greg Lehey <grog@lemis.com> Cc: Scott Mace <smace@intt.org>, FreeBSD Questions <questions@FreeBSD.ORG> Subject: Re: vinum on 2 ide drives? Message-ID: <Pine.BSO.4.21.0105101410460.10452-100000@gandalf.bravenet.com> In-Reply-To: <20010510133425.K56501@wantadilla.lemis.com>
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[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]#
Here are your results as requested.
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.
On Thu, 10 May 2001, Greg Lehey wrote:
> Date: Thu, 10 May 2001 13:34:25 +0930
> From: Greg Lehey <grog@lemis.com>
> To: Scott Mace <smace@intt.org>
> Cc: Dan Phoenix <dphoenix@bravenet.com>,
> FreeBSD Questions <questions@FreeBSD.ORG>
> Subject: Re: vinum on 2 ide drives?
>
> On Wednesday, 9 May 2001 at 22:46:43 -0500, Scott Mace wrote:
> > I'm seeing the same behaviour with a pair of IBM drives. I even made sure
> > that
> > write cache was enabled... I'm using 307030's
> >
> > This is on a regular non-vinum partition
> >
> > onix2# iozone 128 8192
> >
> > IOZONE: Performance Test of Sequential File I/O -- V2.01 (10/21/94)
> >
> > IOZONE writes a 128 Megabyte sequential file consisting of
> > 16384 records which are each 8192 bytes in length.
> > It then reads the file. It prints the bytes-per-second
> > rate at which the computer can read and write files.
>
> This is not really relevant to real-life access. But it might explain
> Dan's issues: sequential access to a stripe will be slower than to a
> concat plex such as you're using.
>
> > IOZONE performance measurements:
> > 21746669 bytes/second for writing the file
> > 29671622 bytes/second for reading the file
> >
> > This is on a vinum mirror.
> >
> > IOZONE performance measurements:
> > 10784600 bytes/second for writing the file
> > 24437936 bytes/second for reading the file
>
> It's difficult to guess what's going on here. Looking at your
> configuration below, I'd guess that you're not comparing things
> directly.
>
> > drive vinumdrive0 device /dev/ad0s1e
> > drive vinumdrive2 device /dev/ad0s1f
> > drive vinumdrive4 device /dev/ad0s1g
> > drive vinumdrive1 device /dev/ad1s1e
> > drive vinumdrive3 device /dev/ad1s1f
> > drive vinumdrive5 device /dev/ad1s1g
>
> These are four drives too many. You don't want more than one drive
> per spindle.
>
> Greg
> --
> Finger grog@lemis.com for PGP public key
> See complete headers for address and phone numbers
>
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