Date: Tue, 24 Nov 1998 10:35:32 +0100 From: Ron Klinkien <root@zappa.demon.nl> To: freebsd-current@FreeBSD.ORG Subject: Re: Adaptec SCSI messages Message-ID: <19981124103532.B613@zappa.demon.nl> In-Reply-To: <19981124011512.B11237@keltia.freenix.fr>; from Ollivier Robert on Tue, Nov 24, 1998 at 01:15:12AM %2B0100 References: <19981114144915.A244@zappa.demon.nl> <Pine.BSF.4.03.9811161602000.17775-100000@resnet.uoregon.edu> <19981117112118.A252@zappa.demon.nl> <19981124011512.B11237@keltia.freenix.fr>
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On Tue, Nov 24, 1998 at 01:15:12AM +0100, Ollivier Robert wrote:
> According to Ron Klinkien:
> > Strange though that after doubling the data transfer rate from 40 -> 80Mb/s
> > iozone 100 doesn't reports any increase of speed.
>
> Because you have enlarged the _bus_ by two doesn't mean the drive is able
> to move bytes faster from the platters.
>
> You are now able to put more disks before saturating the SCSI bus but bear
> in mind that it is very unlikely that you'll be ever eble to saturate a 80
> MB/s bus with only one drive.
> --
> Ollivier ROBERT -=- FreeBSD: The Power to Serve! -=- roberto@keltia.freenix.fr
> FreeBSD keltia.freenix.fr 3.0-CURRENT #2: Sun Nov 8 01:22:20 CET 1998
>
>
> To Unsubscribe: send mail to majordomo@FreeBSD.org
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--
I guess you are right, but i wonder why they have invented Ultra 2 disks
then. Since my disk performed in Single Ended mode exactly the same as
in ULTRA2-LVD mode.
--- cut ---
zappa# iozone 100
IOZONE: Performance Test of Sequential File I/O -- V2.01 (10/21/94)
By Bill Norcott
Operating System: FreeBSD 2.x -- using fsync()
Send comments to: b_norcott@xway.com
IOZONE writes a 100 Megabyte sequential file consisting of
204800 records which are each 512 bytes in length.
It then reads the file. It prints the bytes-per-second
rate at which the computer can read and write files.
Writing the 100 Megabyte file, 'iozone.tmp'...9.742188 seconds
Reading the file...9.062500 seconds
IOZONE performance measurements:
10763250 bytes/second for writing the file
11570493 bytes/second for reading the file
zappa#
--- cut ---
I was hoping it did better than this.
Hmm and strange it reports FreeBSD 2.x
Ron.
---
"You could jam in Joe's garage..." -FZ
Ron Klinkien System Engineer
ron@zappa.demon.nl http://www.zappa.demon.nl
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