Technical data

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 (9.8 feet) of each of the systems.
For use with the MC2 CCMAB adapter, the hub must be placed within 4
meters (13.1 feet) or 10 meters (32.8 feet) (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 3000 meters (9842.5 feet)
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. 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-optic 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-optic connections. You will need one hub for the CCMLB linecards
(and possible optics converters) and up to two hubs for the CCMFB optic
converter modules. The CCMHB-BA hub has no linecards.
5.5 Installing 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
(9.8-foot) link cables to connect Memory Channel adapters and, optionally,
Memory Channel hubs.
Setting Up the Memory Channel Cluster Interconnect 5–7