HP XP External Storage Software - Manual (Page 161)

Corrective action Error
normally, the device can be used immediately. If the
device is blocked as a result of the device status
transition, see the description for the “The external LU
is blocked.” error in this table for corrective action. REQUIRED is issued to
the mainframe host as the
device status.
See the description for the “The external LU is
blocked.” error in this table for the corrective action. The message DEVICE
ERROR
is issued to the
mainframe host as the
device status.
External Storage XP user guide for the XP12000, XP10000, SVS200 161