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Date:      Thu, 17 Feb 2000 13:36:49 -0800
From:      Mike Smith <msmith@freebsd.org>
To:        Brad Knowles <blk@skynet.be>
Cc:        Clifton Royston <cliftonr@lava.net>, Tom <tom@uniserve.com>, freebsd-stable@FreeBSD.ORG
Subject:   Re: Initial performance testing w/ postmark & softupdates... 
Message-ID:  <200002172136.NAA01506@mass.cdrom.com>
In-Reply-To: Your message of "Thu, 17 Feb 2000 22:03:47 %2B0100." <v0422082fb4d211025741@[195.238.1.121]> 

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> 	However, while software RAID-5 may or may not be rock-solid under 
> vinum, I believe that you could implement it with high-end Mylex, 
> AMI, or DPT controllers and so long as the arrays are configured 
> along the lines that Joe lays out and the controllers have enough 
> battery-backed write-back cache, then you ought to be able to make 
> RAID-5 work well enough for you.

I'm not at all convinced that any of these controllers (yet) have the 
throughput to compete with a well-loaded software-RAID system.  It's very 
hard to argue with the compute and data-moving power of a small pile of 
GHz-class processors, and very hard to put that much power on an add-in 
card.

-- 
\\ Give a man a fish, and you feed him for a day. \\  Mike Smith
\\ Tell him he should learn how to fish himself,  \\  msmith@freebsd.org
\\ and he'll hate you for a lifetime.             \\  msmith@cdrom.com




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