Hitachi g800 Reference Manual page 82

Notes:
The mode is applied when downgrading microcode from a
version that supports pool reduction rate correction to a
version that does not support the function is disabled.
This mode disables the warning LED to blink when specific
1097 Inactive
SIMs are reported.
Mode 1097 = ON:
When SIM=452XXX, 462XXX, 3077XY, 4100XX, or 410100
is reported, the warning LED does not blink.
Mode 1097 = OFF (default):
When SIM=452XXX, 462XXX, 3077XY, 4100XX, or 410100
is reported, the warning LED blinks.
Note:
The mode disables the warning LED to blink when specific
SIMs are reported.
82 System option modes
Hitachi Virtual Storage Platform G800 Hardware Reference Guide