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Heinz Mauelshagen 7d6cf12554 lvcreate: reject '--nosync' option for RAID6 LVs
The MD raid6 personality being used to drive lvm raid6 LVs does
read-modify-write updates to any stripes and thus relies on correct
P and Q Syndromes being written during initial synchronization or
it may fail reconstructing proper user data in case of SubLVs failing.

We may not allow the '--nosync' option on
creation of raid6 LVs for that reason.

Update/fix 'man lvcreate' in that regard.

add lvcreate-raid-nosync.sh test script.

- Resolves rhbz1358532
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