1
Link Control Cards (LCCs) 1-11
About the Rackmount Disk-Array Processor Enclosure
visible from the back of the DPE. For a definition of these light colors,
see the “Monitoring DPE Status” section in Chapter 3.
If a DPE has one SP, you can install a second one while the DPE is
running.When both SPs are installed, you can replace either SP while
the DPE is running. You should never attempt to replace any of the
SP’s components, except the memory modules and GBICs.
Link Control Cards (LCCs)A link control card (LCC) is a CRU in an enclosure that connects Fibre
Channel signalling to the disk modules. The LCC provides:
•Fibre channel connectivity between the SP, disks, and other
enclosures
•Bypass capability for faulted or missing units
•Monitor and control of the enclosure elements
Figure 1-8 LCC
Each LCC independently monitors the environmental status of the
entire DPE, using a microcomputer-controlled CRU monitor. The
CRU monitor communicates status to the SP server using special
protocols. These protocols let the SP poll DPE status and send
commands that control the port LCC bypass circuits and the
disk-module check lights.
Latch
Active light
(green)
Check light
(amber)
!
EXP Expansion FC-AL
cable connector