fo_writethrough_cache:1,/**< read cache writes */
fo_mds_ost_sync:1, /**< MDS-OST orphan recovery*/
fo_raid_degraded:1;/**< RAID device degraded */
fo_writethrough_cache:1,/**< read cache writes */
fo_mds_ost_sync:1, /**< MDS-OST orphan recovery*/
fo_raid_degraded:1;/**< RAID device degraded */