Date: Fri, 7 Apr 1995 02:23:09 -0700 (PDT) From: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> To: roberto@keltia.freenix.fr Cc: current@FreeBSD.org Subject: Re: Label/slices : how to add a disk ? Message-ID: <199504070923.CAA07043@gndrsh.aac.dev.com> In-Reply-To: <199504062000.WAA02147@keltia.frmug.fr.net> from "Ollivier Robert" at Apr 6, 95 10:00:14 pm
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>
> Thanks to all... After a few miss from me, it now works.
>
> The whole process is not really user-friendly though :-(
>
> Anyway, the drive is a Conner and it seems very fast :
>
> Excerpts from iozone 2.01 :
>
> 16 512 1927723 2982616
> 16 1024 2957966 4036623
> 16 2048 3969470 4455360
> 16 4096 4373693 4464622
> 16 8192 5100911 4464622
>
> with a peek at 6.5 MB/s !
>
> 8 512 1913978 2974354
> 8 1024 2949840 3976821
> 8 2048 3976821 4382619
> 8 4096 4628197 4418690
> 8 8192 6547206 4382619
>
> Boy I'm happy... Thanks for giving us a system like FreeBSD. It keeps on
> amazing me.
That is an amazing write speed!!
How much memory is in this machine??? As a note to folks it really
helps if you run one really long iozone job to find out about
sustained transfer rate and to eliminate almost all of the buffer cache
effects: (The 16MB limit on iozone auto is not high enough for 16MB
machines, since the buffer cache can now get quite large).
This is on a 16MB machine, P54C-90, NCR810 controller iozone 2.01: The
buffer cache become ineffective at 8MB transfer size, but still skewed
the numbers some (~200K/sec).
16 512 2681003 2725233
16 1024 2732167 2674325
16 2048 2721779 2704639
16 4096 2725233 2721779
16 8192 2739137 2749658
iozone 128 8192:
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.
Writing the 128 Megabyte file, 'iozone.tmp'...53.343750 seconds
Reading the file...51.906250 seconds
IOZONE performance measurements:
2516090 bytes/second for writing the file
2585772 bytes/second for reading the file
--
Rod Grimes rgrimes@gndrsh.aac.dev.com
Accurate Automation Company Custom computers for FreeBSD
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