Re: raidframe performance question

["Michael L. Hitch" <mhitch%lightning.msu.montana.edu@localhost>]

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                        mhitch%montana.edu@localhost
Computer Consultant
Information Technology Center
Montana State University        Bozeman, MT     USA