Odd Status on cpqDaPhyDrvStatus via SNMP

System:  DL380 Gen 8.  OS: XenServer.

Receiving an odd status on one hard drive.  According to the documentation I can find, cpqDaPhyDrvStatus (1.3.6.1.4.1.232.3.2.5.1.1.6.0.8 in my case) could be 1, 2, 3 or 4.  I have one drive that's reporting a 9 via SNMP.

Any idea what a 9 means?

Terry