As of this morning, the Pegasus 2R4 (in Raid 5) attached to a Mac Pro ceased to mount. I have rebooted both, moved the cable on both the computer and the Pegasus. Using the Promise Utility, I cheched for and successfully installed an update. No help. In addition, the utility indicates the Drives are full, whereas last week there was about 3.5 Tb free. I have generated and attached a subsystem report.