HP Cluster Platform Interconnects v2010 Quadrics QsNetII Interconnect - Page 15

Procedure for Cabling the Cluster

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• Do not use a cable assembly if you suspect that it has been damaged. • Do not try to move a system by pulling on its cables. 1.3.2 General Cable Routing Guidelines Keep the following rules in mind when installing other cables, such as connections from the cluster to your local area network: • If possible, route cables in a manner that allows the shortest overall cable length. • Keep signal cables away from power cables. • Avoid sharp cable bends, maintain the minimum bend radius specified for any cable type. • Do not block cluster components from being freely inserted and removed from their shelves. • Do not route cables tightly against the metal edges of the rack. Use the cable management brackets and guides. • When bundling signal cables along the outside of the rack rails, do so in a manner that allows the rack doors to close easily. • If the rack is to be positioned next to other enclosures, maintain a sufficient service loop in any connecting cables to allow the rack to be moved out for access. 1.4 Procedure for Cabling the Cluster This section describes the procedures for cabling HP Cluster Platforms built around the Quadrics QsNetII Interconnect. The cabling solution depends on the type of cluster being built, which is determined by three factors: • HP Cluster Platform packaging. The HP Cluster Platform is either packaged as dense (prepackaged, not expandable) cluster or modular (expandable) clusters. • Platform bandwidth. The HP Cluster Platform is available in full bandwidth or reduced bandwidth configurations. • Node count. Together with the platform bandwidth, the total number of nodes in the cluster determines whether the cluster has a bounded architecture or federated architecture. • Node format and density. HP Cluster platforms are build from a variety of different HP ProLiant and HP Integrity servers. The server nodes can have a 1U, 2U, or 4U height (1U = 1.75" of rack space). The height of the server determines how many servers can fit in a rack, and consequently affects the number of racks that make up the cluster, otherwise known as the cluster's density. The cabling solution for a cluster model depends on this density. Reduced bandwidth clusters of fewer than 128 nodes, and full bandwidth clusters of fewer than 64 nodes have a single interconnect enclosure. This single enclosure is populated with an appropriate number of switch cards, depending on the number of nodes. Such clusters are described as bounded. Reduced bandwidth clusters of more than 128 nodes, or full bandwidth clusters of more than 64 nodes require more than one interconnect enclosure. These Overview of Quadrics-Based Clusters 1-5

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•
Do not use a cable assembly if you suspect that it has been damaged.
•
Do not try to move a system by pulling on its cables.
1.3.2 General Cable Routing Guidelines
Keep the following rules in mind when installing other cables, such as connections
from the cluster to your local area network:
•
If possible, route cables in a manner that allows the shortest overall cable
length.
•
Keep signal cables away from power cables.
•
Avoid sharp cable bends, maintain the minimum bend radius specified for
any cable type.
•
Do not block cluster components from being freely inserted and removed from
their shelves.
•
Do not route cables tightly against the metal edges of the rack. Use the cable
management brackets and guides.
•
When bundling signal cables along the outside of the rack rails, do so in a
manner that allows the rack doors to close easily.
•
If the rack is to be positioned next to other enclosures, maintain a sufficient
service loop in any connecting cables to allow the rack to be moved out for
access.
1.4 Procedure for Cabling the Cluster
This section describes the procedures for cabling HP Cluster Platforms built
around the Quadrics QsNet
II
Interconnect. The cabling solution depends on the
type of cluster being built, which is determined by three factors:
•
HP Cluster Platform packaging.
The HP Cluster Platform is either packaged as
dense
(prepackaged, not
expandable) cluster or
modular
(expandable) clusters.
•
Platform bandwidth.
The HP Cluster Platform is available in
full bandwidth
or
reduced
bandwidth
configurations.
•
Node count.
Together with the platform bandwidth, the total number of nodes in the cluster
determines whether the cluster has a bounded architecture or federated
architecture.
•
Node format and density.
HP Cluster platforms are build from a variety of different HP ProLiant and
HP Integrity servers. The server nodes can have a 1U, 2U, or 4U height (1U =
1.75” of rack space). The height of the server determines how many servers can
fit in a rack, and consequently affects the number of racks that make up the
cluster, otherwise known as the cluster’s
density
. The cabling solution for a
cluster model depends on this density.
Reduced bandwidth clusters of fewer than 128 nodes, and full bandwidth clusters
of fewer than 64 nodes have a single interconnect enclosure. This single enclosure
is populated with an appropriate number of switch cards, depending on the number
of nodes. Such clusters are described as
bounded
.
Reduced bandwidth clusters of more than 128 nodes, or full bandwidth clusters
of more than 64 nodes require more than one interconnect enclosure. These
Overview of Quadrics-Based Clusters
1-5