Scott Silva wrote:
WipeOut spake the following on 4/12/2007 9:38 AM:
Hi,
Since the data is available in two places on a RAID1 array does the code
in any way make use of that for improved performance by reading
(different) data form both disks at the same time? Or is the one disk
simply a slave that just receives copies of the data and is never really
read from at all?
Thanks
AFAIR asks for the data from the raid device, and the md code sends the
request to both drives. The drive that replies with data first is the winner.
So the system would be reading staggered by that method. Now writes are a
different story.
Ok, so in theory then read performance on software RAID1 may be better
than a single disk but how much better would depend on the hit rate of
the requests being distributed..
Whats the story on writes?
You make it sounds like there is something happening there that you are
not happy about..
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