Installation Guidelines; Replacing A Psu; Removing A Psu - Lenovo ThinkSystem DS Series Hardware Installation And Maintenance Manual

Installation guidelines

The recommended order for partially populating drives in the 5U84 enclosure optimizes the airflow through the
chassis. Please reference the following illustrations:
• Figure 25 (page 33)
•
Figure 26 (page 33)
The 5U84 ships with drawers installed in the chassis, However, to avoid shock and vibration issues during transit,
the enclosure does not ship with DDICs installed in the drawers. An enclosure is configured with either 42 disks
(half-populated) or 84 disks (fully populated) for customer delivery. If half-populated, the rows containing disks
should be populated with a full complement of DDICs (no blank slots in the row). The bullet-list below identifies
rows in drawers that should contain DDICs when the enclosure is configured as half-populated:
• Top drawer–front row
• Top drawer–middle row
•
Bottom drawer–front row
If additional disks are incrementally installed into a half-populated enclosure, the DDICs must be added one row at
a time (no blank slots in row) in the sequence listed:
• Bottom drawer–middle row
• Top drawer–back row
• Bottom drawer–back row

Replacing a PSU

Illustrations in the power supply unit module replacement procedures show rear panel views of the enclosure, and
PSUs are properly aligned for insertion into the PSU slots.
See CAUTION bullets regarding electrostatic discharge and anti-static protection on

Removing a PSU

CAUTION: Removing a power supply unit significantly disrupts the enclosure's airflow. Do not remove the
PSU until you have received the replacement module. It is important that all slots are filled when the enclosure is in
operation.
Before removing the PSU, disconnect the power from the PSU by either the mains switch (where present) or by
physically removing the power source in order to ensure your system has warning of imminent power shutdown.
Ensure that you correctly identify the faulty PSU before beginning the step procedure.
1. Stop all I/O from hosts to the enclosure. See also
TIP: This step is not required for hot-swapping. However, it is required when replacing both PSUs at
once.
2. Use management software to shut down any other system components necessary.
TIP: This step is not required for hot-swapping. However, it is required when replacing both PSUs at
once.
3. Per Figure 28 (page
power supply cable.
138 Module removal and replacement
shows location and indexing of drawers accessed from the enclosure front panel.
shows dual-indexing of disk slots across front, middle, and back rows of a drawer.
34), verify the Power OK LED is lit, then switch off the faulty PSU, and disconnect the
"Stopping I/O" (page 128).
page 116.