HP StorageWorks 2000 Series Reference Manual page 170

Invalid Doubleword Count – Specifies the number of invalid doublewords that
have been received by the PHY, not including those received during Link
Reset sequences.
Reset Error Count – Specifies the number of times the expander performed a
reset.
Phy Disabled – Specifies whether the PHY is enabled (True) or disabled
(False).
Fault Reason – A coded value that explains why the EC isolated the PHY. If
the PHY is active, this value is 0x0.
For example, assume that a SAS cable connects Enclosure 0's "out" port to
Enclosure 1's "in" port. If the connection has no faults then PHYs associated with
each port have OK status, as shown in the following figure.
However, if there is a fault in the SAS cable or either of the SAS connectors then
associated PHYs have Non-Critical status as shown in the following figure.