IBM Midrange System DS4000 Series Hardware Manual page 70

If the controller is non-operational due to system configuration, the controller Needs Attention
LED is off. If the controller is non-operational due to a hardware fault, the controller Needs
Attention LED is on. The definitions for Lx diagnostic codes are listed in Table 3-3.
Table 3-3 Numeric display diagnostic codes
Value
L0
L1
L2
L3
L4
L5
L7
L8
88
52
IBM Midrange System Storage Hardware Guide
Controller state Description
Suspend Mismatched controller types.
Suspend Missing interconnect-battery unit.
Suspend Persistent memory errors.
Suspend Persistent hardware errors.
Suspend Persistent data protection errors.
Offline The alternate controller has
incompatible firmware, but the
automatic controller firmware
synchronization (ACS) cannot be
performed.
Suspend/Offline A controller with a different
controller submodel ID is
inserted.
Offline Unsupported memory is present
or memory is not populated in the
correct memory slots.
Reset A controller is held in reset by an
alternate controller.
Storage Manager view
Needs Attention condition for
board type mismatch
Needs Attention condition for
missing interconnect-battery unit
Needs Attention condition for
offline controller
Needs Attention condition for
offline controller
Needs Attention condition for
offline controller
Needs Attention condition for
offline controller
Needs Attention for offline
controller
Need Attention because the
controller is in offline/failed state
N/A