请教freebsd 7 amd64 的日志问题

dmesg



看到好多这个信息  


mpt0: EvtLogData: IOCLogInfo: 0x110a0000
mpt0:   EvtLogData: Event Data:  05020010
mpt0: mpt_cam_event: 0x1
mpt0: EvtLogData: IOCLogInfo: 0x110a0000
mpt0:   EvtLogData: Event Data:  05020010
mpt0: mpt_cam_event: 0x1
mpt0: EvtLogData: IOCLogInfo: 0x110a0000
mpt0:   EvtLogData: Event Data:  05020010
mpt0: mpt_cam_event: 0x1
mpt0: EvtLogData: IOCLogInfo: 0x110a0000
mpt0:   EvtLogData: Event Data:  05020010
mpt0: mpt_cam_event: 0x1
mpt0: EvtLogData: IOCLogInfo: 0x110a0000
mpt0:   EvtLogData: Event Data:  05020010
mpt0: mpt_cam_event: 0x1
mpt0: EvtLogData: IOCLogInfo: 0x110a0000
mpt0:   EvtLogData: Event Data:  05020010
mpt0: mpt_cam_event: 0x1
mpt0: EvtLogData: IOCLogInfo: 0x110a0000
mpt0:   EvtLogData: Event Data:  05020010
mpt0: mpt_cam_event: 0x1
mpt0: EvtLogData: IOCLogInfo: 0x110a0000
mpt0:   EvtLogData: Event Data:  05020010
mpt0: mpt_cam_event: 0x1
(da0:mpt0:0:0:0): WRITE(10). CDB: 2a 0 0 7d 13 8f 0 0 20 0
(da0:mpt0:0:0:0): CAM Status: SCSI Status Error
(da0:mpt0:0:0:0): SCSI Status: Check Condition
(da0:mpt0:0:0:0): UNIT ATTENTION asc:29,2
(da0:mpt0:0:0:0): Scsi bus reset occurred
(da0:mpt0:0:0:0): Retrying Command (per Sense Data)


啥原因？

谢谢~

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