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Date:      Mon, 28 Jan 2002 16:03:04 +0100
From:      Poul-Henning Kamp <phk@critter.freebsd.dk>
To:        Jason Andresen <jandrese@mitre.org>
Cc:        freebsd-hackers@FreeBSD.ORG
Subject:   Re: vinum write spanning 
Message-ID:  <42117.1012230184@critter.freebsd.dk>
In-Reply-To: Your message of "Mon, 28 Jan 2002 09:49:59 EST." <3C556517.CED19C80@mitre.org> 

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In message <3C556517.CED19C80@mitre.org>, Jason Andresen writes:
>I'm hoping there is an easy answer to this one...
>
>Is there some way vinum can be tickled such that it writes to all disks
>in a plex at once?  For instance, say I have a 6 disk RAID5 array
>that I'm writing a 200MB file to.  Is there some way I can make 
>vinum attempt to write data to all of the drive simultaniously?
>
>If vinum already does that I'm probably just saturating the PCI bus
>and there's nothing more I can do, but it seems like I should have
>a tougher time saturating the bus with 5400RPM drives...

You can (over-)saturate a 32bit/33MHz pci bus with two or three
modern ATA disks.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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