mpt_cam_event? what is that?

[Tekkie]

Code:

Jul  4 22:56:57 shrek root: ZFS: checksum mismatch, zpool=storage1 path=/dev/gptid/f64efe95-a562-11e0-93da-001b21ad7873 offset=600647643136 size=4096
Jul  4 22:56:57 shrek root: ZFS: checksum mismatch, zpool=storage1 path=/dev/gptid/f64efe95-a562-11e0-93da-001b21ad7873 offset=600647639040 size=4096
Jul  4 22:56:59 shrek kernel: mpt0: mpt_cam_event: 0x16
Jul  4 22:56:59 shrek kernel: mpt0: mpt_cam_event: 0x16
Jul  4 22:56:59 shrek kernel: (da2:mpt0:0:2:0): READ(10). CDB: 28 0 46 2c d2 78 0 0 8 0 
Jul  4 22:56:59 shrek kernel: (da2:mpt0:0:2:0): CAM status: SCSI Status Error
Jul  4 22:56:59 shrek kernel: (da2:mpt0:0:2:0): SCSI status: Check Condition
Jul  4 22:56:59 shrek kernel: (da2:mpt0:0:2:0): SCSI sense: UNIT ATTENTION asc:29,0 (Power on, reset, or bus device reset occurred)

Code:

Jul  4 19:17:50 shrek kernel: (probe0:umass-sim0:0:0:0): TEST UNIT READY. CDB: 0 0 0 0 0 0 
Jul  4 19:17:50 shrek kernel: (probe0:umass-sim0:0:0:0): CAM status: SCSI Status Error
Jul  4 19:17:50 shrek kernel: (probe0:umass-sim0:0:0:0): SCSI status: Check Condition
Jul  4 19:17:50 shrek kernel: (probe0:umass-sim0:0:0:0): SCSI sense: UNIT ATTENTION asc:28,0 (Not ready to ready change, medium may have changed)