IBM 4957-J11, Hardware Installation And Maintenance Manual

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component within the drive channel. This LED is normally off, and illuminates only when a fault occurs
with a component beneath the top lid.
Pull the chassis forward from its installed position within the rack. Remove the top lid and look for an
amber LED on any of the disk drive modules or HS expander modules on the side-plane. Replace the
faulty module per the applicable CRU replacement procedure.
Firmware fault LED
The LED illuminates amber when experiencing a firmware application fault such as a firmware upgrade
failure or memory corruption. This LED is normally off, and illuminates only when a firmware-related fault
occurs. See troubleshooting procedures if this fault displays.
Fault LED - rear panel (amber)
The LED illuminates amber when experiencing a system hardware fault with a component accessible via
the enclosure rear panel (IOMs, PSUs, system fans). This LED is normally off, and illuminates only when a
fault occurs with a component installed in the enclosure rear panel.
Observe the enclosure rear panel, and look for a fault indicator on the modules installed.
Fault LED - top lid left (amber)
The LED illuminates amber when experiencing a system hardware fault with a component accessible via
the enclosure top panel. Amber display indicates that the top lid on the left should be removed to locate
the faulty component within the controller channel. This LED is normally off, and illuminates only when a
fault occurs with a component beneath the top lid on the left.
Pull the chassis forward from its installed position within the rack. Remove the top left lid and look for an
amber LED on any of the disk drive modules or controller channel fans. Replace the faulty module per the
applicable CRU replacement procedure.
Rear panel LEDs
The Disk Enclosure rear panel LEDs are described.
Power supply unit
AC-DC power is provided by up to two auto-ranging power supply modules (PSUs). Cooling is provided by
four separate cooling fans and two controller module fans. The IOM provides power and LED control. Also
see the “System airflow” on page 18 section for optimal cooling within the enclosure(s).
2,000W PSU
The 2,000W PSU voltage operating range is nominally 200V–240V AC, and operates at 50–60 Hz input
frequency. In the figure below, the dimetric rear orientation shows the PSU aligned for insertion into
either PSU slot located on the enclosure rear panel.
16 IBM Cloud Object Storage System: Medium/Large J11/J12 Disk Enclosure Hardware Installation and
Maintenance Manual