EMC® VNX5300™ Hardware Information Guide
60
EMC® VNX5300™ Hardware Information Guide
The 3U, 15 (3.5-inch)
DAE rear view
On the rear, viewing from top to bottom (Figure 57 on page 61), a 3U, 15 (3.5-inch)
DAE includes the following hardware components:
◆ Two 6-Gb/s SAS LCCs (A and B)
◆ Two power supply/cooling modules
6-Gb/s SAS LCC The LCC supports and controls one 6 Gb/s SAS bus and monitors the DAE. A blue
link active LED indicates a DAE operating at 6 Gb/s.
The LCCs in a DAE connect to the DPE and other DAEs with 6 Gb/s cables. The
cables connect the LCCs in a system together in a daisy-chain (loop) topology.
Internally, each DAE LCC connects to the drives in its enclosure in a point-to-point
fashion through a switch. The LCC independently receives and electrically terminates
incoming signals. For traffic from the system’s storage processors, the LCC switch
passes the signal from the input port to the drive being accessed; the switch then
forwards the drive output signal to the port.
Note: If the target drive is not in the LCC’s enclosure, the switch passes the input signal
directly to the output port.
Each LCC independently monitors the environmental status of the entire enclosure,
using a microcomputer-controlled monitor program. The monitor communicates the
status to the storage processor, which polls disk enclosure status. LCC firmware also
controls the SAS PHYs and the disk-module status LEDs.
To Next Page
Loading...
