Dell DAE2P Hardware Reference - Page 25

Disk modules About DAE2P and DAE3P disk enclosures signals from the expansion port directly to the output signal of the primary port. Each LCC independently monitors the environmental status of the entire enclosure, using a microcomputer-controlled FRU (field-replaceable unit) monitor program. The monitor communicates status to the server, which polls disk enclosure status. LCC firmware also controls the LCC port bypass circuits and the disk-module status lights. LCCs do not communicate with or control each other. Each LCC has four status lights. These status lights are described in "Monitoring disk enclosure status," in Chapter 3. Captive screws on the LCC lock it into place to ensure proper connection to the midplane. You can add or replace an LCC while the disk enclosure is powered up. Each disk module consists of one disk drive in a carrier. You can add or remove a disk module while the DAE2P/DAE3P is powered up, but should exercise special care when removing modules while they are in use. DAE2P and DAE3P disk modules support dual-port FC-AL interconnects through the two LCCs and their cabling; SATA modules include a paddle card that provides a bridge between Fibre Channel and SATA signals. With some configuration restrictions, you can integrate and connect Fibre Channel and ATA (Advanced Technology Attachment) DAE2 enclosures with DAE2P/DAE3Ps within a storage system, but you cannot use ATA disks within a DAE2P or DAE3P. (DAE3P SATA disks will not work in a DAE2-ATA enclosure.) A DAE3P enclosure can include Fibre Channel or SATA disk modules, but not both types; DAE2P enclosures do not support SATA disk modules.You can visually distinguish between module types by their different latch and handle mechanisms and by labels on each module. 4 Gb Fibre Channel drive carriers include a label that indicates they can operate at 2/4 Gb; 2 Gb drive labels list capacity and spindle speed only. SATA drive labels list type, capacity, and Disk modules 1-9