I know that RAID 10 (aka 0+1) is striped and mirrored
Up until the other day, I had always believed that RAID 10 writes (on a 4 drive set) were striped across 2 sets of mirrored pairs. Hence striped across 2 set for reads and striped across 2 sets for writes.
Then I heard that (in an EMC array) writes would be striped across 2 (pairs of) drives for writes, but striped across all 4 drives for reads.
This makes a lot of sense because both the primary drive and its mirror contain identical data, so there is no reason that reads could not be striped again with the mirrored drives.
My question is: Is this the actual RAID 10 (0+1) standard ?
please support your comments with links to any official definition of RAID standards