Dell FC4500 Reference Guide - Page 52

Servicing and Upgrading a DPE 3 Table 3-2 Status Lights Color Codes, Back of DPE (continued) Light Power Supply Check Cooling Check Quantity 1 per supply 1 per supply Drive Fan Pack Check 1 on fan pack Color Amber Amber Yellow Meaning On when the power supply is faulty or is not receiving ac line voltage. 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. On when a fan in the drive fan pack is faulty. • 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 Power Issues and CRUs This section describes the precautions that you must take, and the general procedures you must follow when removing, installing, and storing 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. 3-4 EMC Fibre Channel Disk-Array Processor Enclosure (DPE) Hardware Reference