David Dougall wrote:
reads from a Raid1 md device will always round-robin between
the devices to increase performance.
If it was round-robin that would actually decrease the performance, it's
locality based. It reads from the RAID member that last operated in the
physical vicinity of the requested data to be read. ie it minimize the
distance disk heads have to move. This is one way RAID1 lowers average
seek time.
-ryan
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