3
3-4 EMC Fibre Channel Disk-Array Processor Enclosure (DPE) Hardware Reference
Servicing and Upgrading a DPE
•If the DPE Check light is on, you should look at the other Check
lights to determine which CRU(s) are faulty. If the Check light for
a CRU remains on, replace the CRU as soon as possible.
•If a CRU fails in a DPE that is highly available, the DPE’s high
availability and write cache functionality (if any) will be
compromised until you replace the faulty CRU.
Handling CRUs
This section describes the precautions that you must take, and the
general procedures you must follow when removing, installing, and
storing CRUs.

Power Issues and

CRUs The DPE is designed to be powered up at all times and hot repairable.
Its front door should be closed and each of its compartments should
contain a CRU or filler panel to ensure EMI compliance and proper
air flow over the CRUs.
While the DPE is powered up, you can service or replace any CRU,
although removing an active LCC or SP will affect operating system
access to the LUNs it controls. Do not remove a faulty CRU until you
have a replacement available.
You can remove the drive fan pack or SP fan pack while the DPE is powered
up. If the pack is removed for more than two minutes, the SPs and disk
modules power down. The SPs and disk modules power up when you
reinstall the drive or SP fan pack.
Power Supply Check 1 per supply Amber On when the power supply is faulty or is not
receiving ac line voltage.
Cooling Check 1 per supply Ambe r Flashing when multiple fans in the drive fan pack
are faulty or the drive fan pack is removed.
The DPE powers down the SPs and disk drives
when the fault persists for more than about two
minutes.
Drive Fan Pack Check 1 on fan pack Yellow On when a fan in the drive fan pack is faulty.
Table 3 -2 Status Lights Color Codes, Back of DPE (continued)
Light Quantity Color Meaning