IBM SAN512B-6, Installation, Service And User Manual

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6. Airflow label
7.
Captive screw
The SAN512B-6 Director can have three or four power supplies installed,
depending on the quantity ordered. Use of the high-voltage line (200 to 240 VAC)
is highly recommended because of better power conversion efficiency. Refer to
"Power Supply Requirements" in Appendix B, “Product specifications,” on page
235 for minimum power supplies required for AC low and high voltage line
operation, redundancy in case of power supply failure, and other specifications.
Redundant AC primary power connections ensure high availability. Each power
supply has its own connector. If four power supplies are installed, four primary
power connections are required for the SAN512B-6 Director for optimum efficiency
and redundancy.
Power supplies can be removed and replaced without special tools. If replacing
one power supply, the device can continue operating during replacement if
procedures are followed in this guide.
Power cords for these power supplies that meet your site and country
requirements are available from IBM.
Fan and power supply airflow
All fans and power supply FRUs installed in this device must have either NPI
(nonport-side intake) or NPE (nonport-side exhaust) airflow. You must order a
replacement FRU with the same part number (P/N) as the FRU being replaced to
provide the same airflow. The manufacturing P/N, located on the top of the FRU,
contains either NPI or NPE. If a mismatched power source or fan assembly is
installed by mistake, a RASlog message occurs indicating that a mismatch in fan or
power supply airflow has occurred and the FRU is faulted.
Note: If airflow direction for a power supply assembly does not match the chassis
airflow direction as stored on WWN cards, the power supply will have a "fault"
status. However, LED operation for the power supply will not indicate a fault. If
airflow direction for a fan assembly does not match the chassis airflow direction,
the fan LED will indicate a fault condition.
You can use external labels as a guide. The power supply and fan assemblies are
labeled with a green "E" or orange "I" airflow symbol on the faceplate. The symbol
also appears on the top of the FRU. All fans and power supplies in a chassis must
have the same label affixed to guarantee airflow direction is consistent.
Figure 46. Airflow labels
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SAN512B-6 Installation, Service, and User Guide
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