Jens Bäckman wrote:

On Wed, May 28, 2008 at 10:53 AM, Justin Piszcz [off-list ref] wrote:

quoted

Results:

http://home.comcast.net/~jpiszcz/raid/20080528/raid-levels.html
http://home.comcast.net/~jpiszcz/raid/20080528/raid-levels.txt

Either the RAID 1 read speed must be wrong, or something is odd in the
Linux implementation. There's six drives that can be used for reading
at the same time, as they contain the very same data. 63MB/s
sequential looks like what you would get from a single drive.

The test is a single thread reading one block at a time, so this is not 
surprising.  If you get this doing multi-megabyte readahead, or with 
several threads, something is very wrong.

-- Chris
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