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EMC Disk-Array Processor Enclosure (DPE) Deskside Model FC4400/4500 Hardware Reference
Installing a Deskside DPE
DPE Powerdown
If a DPE (with an SPS option) is powered down abnormally (for
example, if the plug is accidentally disconnected or a power failure
occurs), data is saved to the storage-system vault disks, not lost.
However, when the DPE is powered up again, it will take longer to
come on line because it first must write the vault disk data to the
correct LUNs.
Turning Off Power
Correctly
1. Stop any I/O activity to the DPE.
2. If the server connected to the DPE is running the UNIX®
operating system, unmount the file systems.
3. If the DAE does not have SPS protection, use the circuit breaker
on each PDU to turn off power.
Figure 2-13
Powering Down
When you turn off power to a storage system with an SPS, the On
Battery light may come on for a maximum of 90 seconds during
which time the DPE will continue to run. This is a normal
condition. Wait for the light to go off and the fans to stop before
proceeding with further service to the storage system.
PDU power switches
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