Removing A Psu Module - Seagate Exos AP 4U100 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 CRU slots are filled when the enclosure is in operation.
Before removing the PSU, disconnect the power from the faulty PSU by physically removing the power cable in order to
ensure your system has warning of imminent power shutdown. A faulty PSU must be replaced by a fully operational PSU
within 2 minutes of its removal. Ensure that you correctly identify the faulty PSU before beginning the step procedure.
1. Stop all I/O from hosts to the enclosure. See
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 two power cables from the PSU power connectors to power OFF the faulty PSU (it has no power
switch).
IMPORTANT: Make sure that you remove the cables from PSU end and not from the PDU end. Ideally, cables
of a PSU are attached to different PDUs (See
of one core of each PSU, but the other core of the PSUs will remain active.
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
4. Remove the rear stabilizer bar connected to the enclosure.
5. If replacing a single PSU via hot-swap, proceed to
6. If replacing both PSUs, verify that the enclosure was shut down using management interfaces, and that the enclosure
is powered OFF.
7. Verify that the power cables of the replaceable PSU are disconnected.
"Stopping I/O" (page
Figure 68). Removing cables from a single PDU will cut the power
"Routing cables using CMA" (page
step 7.
107).
69).
Replacing a PSU module 91