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Re: raidframe performance question

On Fri, 6 May 2011, Paul Goyette wrote:

Conclusion:  these disk drives suck!  It's not a raidframe problem....

Not really... this is a different problem and not reflective of the drive.

        dd if=/dev/zero bs=32k of=/dev/wd4d
got full. :) All the while, the systat output shows that the xfer-bytes is always 2K times the xfer-ops, so would indicate that something is breaking up the writes into 2K chunks.

That's what you get for writing to the block device :) The write data goes into the buffer cache which is going to use 2K blocks. You really, really want to be using the character device /dev/rwd4d. It works much better.

Michael L. Hitch              
Computer Consultant
Information Technology Center
Montana State University        Bozeman, MT     USA

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