ServerNet Cluster Web

Add SPRs to G06.19 and G06.20 to obtain support for the layered topology built

with 6780 switches (for clusters up to 64 nodes). For information about these SPRs,

refer to the ServerNet Cluster Planning and Installation Guide.

Are ServerNet clusters customer-installable? Yes. With special training,

customers can perform all tasks for installing a ServerNet cluster.

How do I construct a ServerNet cluster? Assuming the correct software is

installed on each system that will join the ServerNet cluster, you construct the

cluster by installing cluster switches for the external ServerNet X and Y fabrics and

then connecting the group 01 enclosure of each system to the cluster switches using

fiber-optic cables. Systems are added to the cluster one at a time. You must use the

guided procedure to add a ServerNet node to the cluster.

What is the maximum possible distance between nodes in a ServerNet

cluster?

Star topology: 160 meters (528 feet).

Tri-star or split-star topology: 5160 meters (17,028 feet).

Layered topology: 5160 meters (17,028 feet) when using single-mode fiber cables

between zones.

Regardless of the topology, a node can be positioned no more than 80 meters (264

feet) from a cluster switch. This is cable distance, which may be reduced by bends

in the cable. Because a star topology uses only one cluster switch per fabric, the

maximum distance between two nodes connected to a cluster switch is 160 meters

(528 feet).

For topologies that support multiple cluster switches per fabric, the distance possible

depends on the type of fiber-optic cables used between switches and the type of

nodes in the ServerNet cluster. For these topologies, the greatest possible distance

between the cluster switches is 5 kilometers if the correct software and processors

are used in all nodes of the cluster.

As of G06.22, a long-distance option is available for the layered topology as a

restricted SPR. The long-distance option supports distances up to 15km between

cluster switches. For details, see the G06.22 or later ServerNet Cluster 6780

Planning and Installation Guide.

Measure

Is Measure supported for ServerNet clusters? Yes. Counters have been added

to the CPU, PROCESS, and SERVERNET entities to support ServerNet clusters.

Message System

Are message system statistics provided? Yes. Statistics are gathered

continuously by each processor. Each processor keeps a set of counters for each

node in the cluster, including the local node. Statistical information is reported using

an EMS event: ZSCL-EVT-STATISTICS. On an hourly basis, SNETMON causes the

generation of this event. Operators can use the TSM Service Application to generate

the event on demand or reset the counters. The event and its token information can

be viewed using the TSM EMS Event Viewer Application.