From owner-freebsd-questions  Sat Nov  6  3:49:40 1999
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To: rsnow@lgc.com
Cc: gurney_j@resnet.uoregon.edu, freebsd-questions@freebsd.org
Subject: Re: writing much slower than reading...
From: sthaug@nethelp.no
In-Reply-To: Your message of "Sat, 06 Nov 1999 05:10:56 -0600"
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> Emm, I want your system.  Have you double checked your numbers?  They
> look a bit high. Here's what I get on a vinum stripe across two 'cudas
> on an SMP box:
> 
> rsnow@basil% time dd if=/dev/vinum/rstripe of=/dev/null bs=64k
> count=2048
> 2048+0 records in
> 2048+0 records out
> 134217728 bytes transferred in 7.938773 secs (16906609 bytes/sec)
> 0.007u 0.520s 0:07.98 6.5%      73+371k 2+0io 0pf+0w

I can confirm the sequential read numbers for the DPTA-372730. The disk
rotates at 7200 RPM and has extremely high bit density. Thus very high
numbers for sequential read. I consistently get more than 23 MByte/s
(M = 1000000 here).

Haven't tried the sequential write yet. Right now I'm testing it with
rawio, after having run some bonnie tests.

Steinar Haug, Nethelp consulting, sthaug@nethelp.no


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