NonStop Systems Introduction for H-Series RVUs

Integrity NonStop NS-Series Server Architecture
NonStop Systems Introduction for H-Series RVUs—540083-001
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ServerNet Clustering for Availability and
Performance
ServerNet clusters allow multiple multiprocessor systems to work together and appear
to client applications as one large processing entity. Up to 24 servers can be joined in a
cluster.
ServerNet clustering provides several benefits:
•
Performance. For interprocessor communication, ServerNet clusters take
advantage of the NonStop message system for low message latencies, low
message processor costs, and high message throughput. The same message
system is used for interprocessor communication within a node and between
cluster nodes. Furthermore, ServerNet clusters take advantage of the transmission
speeds of ServerNet for fast message throughput between nodes.
•
Availability. If a cluster node experiences a problem, the ServerNet cluster makes it
easy to bypass the problem by diverting the workload to other nodes.
•
Manageability. ServerNet clusters make it easy to share resources among cluster
nodes. In addition, ServerNet provides a quick-disconnect capability that makes it
easy to implement planned outages.
•
Scalability. ServerNet clusters can be expanded (up to 24 servers) as your network
load increases.
Figure 7-8. 4-Node ServerNet Cluster
Node 1 Node 2 Node 4
ServerNet
interface
Node 3
XYY X X YY X
External ServerNet Y fabric
External ServerNet X fabric
ServerNet
interface
ServerNet
interface
ServerNet
interface
VST096.vsd
Cluster switch
Cluster switch