When a fault occurs on a drive, error messages are displayed on the system console about the drive and the RAID volume that includes that drive. For example, these messages on a system console display indicate that volume 905 has been degraded with the loss of PhysDiskNum 1:
Mar 16 16:28:26 hostname scsi: /pci@400/pci@2/pci@0/pci@e/scsi@0 (mpt_sas0): Mar 16 16:28:26 hostname PhysDiskNum 1 with DevHandle 0xc in slot 0 for enclosure with handle 0x0 is now offline Mar 16 16:28:26 hostname scsi: /pci@400/pci@2/pci@0/pci@e/scsi@0 (mpt_sas0): Mar 16 16:28:26 hostname PhysDiskNum 1 with DevHandle 0xc in slot 0 for enclosure with handle 0x0 is now , active, out of sync Mar 16 16:28:26 hostname scsi: WARNING: /pci@400/pci@2/pci@0/pci@e/scsi@0 (mpt_sas0): Mar 16 16:28:26 hostname Volume 905 is degraded Mar 16 16:28:26 hostname scsi: /pci@400/pci@2/pci@0/pci@e/scsi@0 (mpt_sas0): Mar 16 16:28:26 hostname Volume 0 is now degraded Mar 16 16:28:26 hostname scsi: WARNING: /pci@400/pci@2/pci@0/pci@e/scsi@0 (mpt_sas0): Mar 16 16:28:26 hostname Volume 905 is degraded
# more /var/adm/messages*
Refer to the information about these messages and others in the service manual for the server.