I see a lot of messages like below. Last weekend the server was not responding at all and we need to reboot. The da3 message is always the same, it is never another port. The drive is part of a ZFS mirrored vdev. Do i need to worry or is it just the mps driver and do i need the new one. system is FreeBSD 9.0-RELENG amd64 +mps0: (4:3:0) terminated ioc 804b scsi 0 state c xfer 0 +mps0: (4:3:0) terminated ioc 804b scsi 0 state c xfer 0 +mps0: (4:3:0) terminated ioc 804b scsi 0 state c xfer 0 +mps0: (4:3:0) terminated ioc 804b scsi 0 state c xfer 0 +mps0: (4:3:0) terminated ioc 804b scsi 0 state c xfer 0 +mps0: (4:3:0) terminated ioc 804b scsi 0 state c xfer 0 +(da3:mps0:0:3:0): READ(10). CDB: 28 0 1 de da 1f 0 0 80 0 +(da3:mps0:0:3:0): CAM status: SCSI Status Error +(da3:mps0:0:3:0): SCSI status: Check Condition +(da3:mps0:0:3:0): SCSI sense: UNIT ATTENTION asc:29,1 (Power on occurred) +(da3:mps0:0:3:0): Field Replaceable Unit: 1 +mps0: (4:3:0) terminated ioc 804b scsi 0 state c xfer 0 +mps0: (4:3:0) terminated ioc 804b scsi 0 state c xfer 0 +mps0: (4:3:0) terminated ioc 804b scsi 0 state c xfer 0 +mps0: (4:3:0) terminated ioc 804b scsi 0 state c xfer 0 +mps0: (4:3:0) terminated ioc 804b scsi 0 state c xfer 0 +mps0: (4:3:0) terminated ioc 804b scsi 0 state c xfer 0 +mps0: (4:3:0) terminated ioc 804b scsi 0 state c xfer 0 +mps0: (4:3:0) terminated ioc 804b scsi 0 state c xfer 0 +(da3:mps0:0:3:0): READ(10). CDB: 28 0 1e 9f 5a 28 0 0 80 0 +(da3:mps0:0:3:0): CAM status: SCSI Status Error +(da3:mps0:0:3:0): SCSI status: Check Condition +(da3:mps0:0:3:0): SCSI sense: UNIT ATTENTION asc:29,1 (Power on occurred) +(da3:mps0:0:3:0): Field Replaceable Unit: 1 The drives pass the smart test SMART status: Checking health of /dev/ada0: OK Checking health of /dev/ada1: OK Checking health of /dev/da0: OK Checking health of /dev/da1: OK Checking health of /dev/da2: OK Checking health of /dev/da3: OK Checking health of /dev/da4: OK Checking health of /dev/da5: OK Checking health of /dev/da6: OK Checking health of /dev/da7: OK Checking health of /dev/da8: OK Checking health of /dev/da9: OK Checking health of /dev/da10: OK Checking health of /dev/da11: OK Checking health of /dev/da12: OK Checking health of /dev/da13: OK Checking health of /dev/da14: OK Checking health of /dev/da15: OK regards johan