Removing A Psu Module - Seagate Exos E 4U106 Hardware Installation And Maintenance Manual

Removing a PSU module

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 FRU slots are filled when the
enclosure is in operation.
Before removing the PSU, disconnect the power from the PSU by physically removing the power source in order to
ensure your system has warning of imminent power shutdown. A faulty PSU must be replaced by a fully
operational PSU as soon as possible. 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. Disconnect the power cable from the PSU power connector to power off the faulty PSU (it has no power
switch).
NOTE: Power cables are typically routed to the PSU from the cable management arm (CMA). Verify that
the 180º power cable bends lie flat in the CMA baskets. Ensure that the cable lays flat on the CMA shelf
and through the cable clip assembly. See also
(page 59)
4. If replacing a single PSU via hot-swap, proceed to
5. If replacing both PSUs, verify that the enclosure was shut down using management interfaces, and that the
enclosure is powered off.
6. Verify that the power cord is disconnected.
for more details.
"Stopping I/O" (page 86).
Figure 4 (page 19) and "Routing cables using the CMA"
step 6.
Replacing a PSU module 75