7311 Model D20 I/O Drawer Spcn Cabling; External Disk Subsystems - IBM System p5 550 Technical Overview And Introduction

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2.8.4 7311 Model D20 I/O drawer SPCN cabling

SPCN is used to control and monitor the status of power and cooling within the I/O drawer.

The SPCN is a loop (Figure 2-12); the cabling starts from SPCN port 0 on the p5-550 or

p5-550Q system to SPCN port 0 on the first I/O drawer. The loop is closed, connecting the

SPCN port 1 of the I/O drawer back to the port 1 of p5-550 or p5-550Q system. If you have

more than one I/O drawer, you continue the loop connecting the following drawer (or drawers)

with the same rule.

I/O drawer or secondary drawer

Figure 2-12 SPCN cabling examples

There are different SPCN cables to satisfy different length requirements:

SPCN cable drawer to drawer, 2 m (FC 6001)

SPCN cable drawer to drawer, 3 m (FC 6006)

SPCN cable rack to rack, 6 m (FC 6008)

SPCN cable rack to rack, 15 m (FC 6007)

SPCN cable rack to rack, 30 m (FC 6029)

The p5-550 or p5-550Q has internal hot-swappable drives. When the AIX 5L operating

system is installed in an IBM System p5 server, the internal disks are usually used for the

AIX 5L rootvg volume group and paging space. Specific client requirements can be satisfied

with the several external disk possibilities that the p5-550 or p5-550Q supports.

IBM System p5 550 and 550Q Technical Overview and Introduction

Primary drawer

SPCN port 0

SPCN port 1

SPCN port 0

SPCN port 1

Primary drawer

SPCN port 0

SPCN port 1

I/O drawer or secondary drawer

SPCN port 0

SPCN port 1

I/O drawer or secondary drawer

SPCN port 0

SPCN port 1

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System p5 550q