I have a Clariion cx700. PowerPath on my exchange server reported the errors below. We have a single port HBA and configured for failover. PowerPath Monitor reports pathname "c4t0d1" as failed, "c4t0d0" as optimal. Under "disk's", it shows "Disk 006" and "Dev ???". Did a drive die? The switches seem ok.
Event Log errors:
1: Path Bus 4 Tgt 0 Lun 1 to APM00052803117 is dead.
2: The device 'DGC RAID 5 SCSI Disk Device' (SCSI\Disk&Ven_DGC&Prod_RAID_5&Rev_0219\4&b5496fb&0&001) disappeared from the system without first being prepared for removal.