Technical data

Figure 2–1: PCI Backplane Slot Layout

I/O Riser 0

I/O Riser 1

0-0/10-20-30-40-50-60-71-11-21-31-41-51-61-7

PCI 0

PCI 1

PCI 0

1-R 0-R

ZK-1748U-AI

• TruCluster Server does not support the XMI CIXCD on an AlphaServer

8x00, GS60, GS60E, or GS140 system.

2.2 Memory Channel Restrictions

The Memory Channel interconnect is one method used for cluster

communications between the member systems.

There are currently three versions of the Memory Channel product: Memory

Channel 1, Memory Channel 1.5, and Memory Channel 2. The Memory

Channel 1 and Memory Channel 1.5 products are very similar (the PCI

adapter for both versions is the CCMAA module) and are generally referred

to as MC1 throughout this manual. The Memory Channel 2 product

(CCMAB module) is referred to as MC2.

Ensure that you abide by the following Memory Channel restrictions:

• The DS10, DS20, DS20E, ES40, GS80, GS160, and GS320 systems only

support MC2 hardware.

• If you configure a cluster with a single rail Memory Channel in standard

hub mode and the hub fails, every cluster member panics. They panic

because no member can see any of the other cluster members over the

Memory Channel interface. A quorum disk does not help in this case,

because no system is given the opportunity to obtain ownership of the

quorum disk and survive.

To prevent this situation in standard hub mode, install a second Memory

Channel rail. A hub failure on one rail will cause failover to the other rail.

Hardware Requirements and Restrictions 2–3