Compaq AA-RHGWC-TE manual Installing the Memory Channel Hub, Installing the Memory Channel Cables

5.4 Installing the Memory Channel Hub

You may use a hub in a two-node TruCluster Server cluster, but the hub is not required. When there are more than two systems in a cluster, you must use a Memory Channel hub as follows:

•For use with the MC1 or MC1.5 CCMAA adapter, you must install the hub within 3 meters of each of the systems.

For use with the MC2 CCMAB adapter, the hub must be placed within 4 or 10 meters (the length of the BN39B link cables) of each system. If fiber optics is used in conjunction with the MC2 adapter, the hub may be placed up to 31 meters from the systems.

•Ensure that the voltage selection switch on the back of the hub is set to select the correct voltage for your location (115V or 230V).

•Ensure that the hub contains a linecard for each system in the cluster (the hub comes with four linecards) as follows:

–CCMLA linecards for the CCMHA MC1 hub

–CCMLB linecards for the CCMHB MC2 hub. Note that the linecards cannot be installed in the opto only slot.

•If you have a four-node cluster, you may want to install an extra linecard for troubleshooting use.

•If you have an eight-node cluster, all linecards must be installed in the same hub.

•For MC2, if fiber optics converters are used, they can only be installed in hub slots opto only, 0/opto, 1/opto, 2/opto, and 3/opto.

•If you have a five-node or greater MC2 cluster using fiber optics, you will need two or three CCMHB hubs, depending on the number of fiber optics connections. You will need one hub for the CCMLB linecards (and possible optics converters) and up to two hubs for the CCMFB optics converter modules. The CCMHB-BA hub has no linecards.

5.5Installing the Memory Channel Cables

Memory Channel cable installation depends on the Memory Channel module revision, and whether or not you are using fiber optics. The following sections describe how to install the Memory Channel cables for MC1 and MC2.

5.5.1 Installing the MC1 or MC1.5 Cables

To set up an MC1 or MC1.5 interconnect, use the BC12N-10 3-meter link cables to connect Memory Channel adapters and, optionally, Memory Channel hubs.

Setting Up the Memory Channel Cluster Interconnect 5–7