Enhance vdev layer to maintain logical and physical block sizes#1671

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prakashsurya wants to merge 3 commits intoopenzfs:masterfrom prakashsurya:ashift

+274-75

Commits on Aug 21, 2013

Revert "Allow setting a lower ashift with -o ashift"
Prakash Surya
committed
Reports pools which have a removed l2cache disk under -x as this is what happens when a cache device is dropped for any reason.

smh
authored and
Prakash Surya
committed
Enhance the ZFS vdev layer to maintain both a logical and a physical
Prakash Surya
committed