How to turn on async write of rbd ?

[<Eric_YH_Chen@xxxxxxxxxx>]

Dear All:

   I saw rbd support "async writes" since 0.36, http://ceph.com/2011/09/
   But I cannot find related document that how to turn on it.
   Should I just write "enabled" to /sys/devices/rbd/0/power/async?

   One more thing, If I want to implement iSCSI multipath with RBD, just
like http://ceph.com/wiki/ISCSI
   Can I turn on the async writes under this situation?

   Thanks!


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