A Micro Focus OES Cluster Example
Last updated
Last updated
A simple OES cluster is illustrated below.
Each of the three physical computers (Node X, Node Y, and Node Z) contains a local disk. Node X and Node Y are OES Linux nodes with NSS file system, Node Z is an OES Linux node with a traditional Linux file system. In addition, the three computers, or client machines, share two storage resources (VOL1 and VOL2) via a single shared connection. (A shared resource can be a storage pool or storage volume.)
Though not shown in the illustration, each of the three client machines is instantly able to sense if another has failed or is down.
In DPX, you define nodes and node groups. For an OES cluster, you define physical nodes for the local storage resources and a single virtual node for the shared storage resources. The following rules apply to defining OES cluster nodes in DPX:
For each client machine, one physical node must be defined to represent all local volumes on that machine. Thus, for the example above, you define three physical nodes, one for each client machine.
One virtual node must be defined for the cluster. All shared storage resources are backed up through this virtual node.
All the nodes (physical and virtual) for a cluster must be members of the same node group.
The following illustration shows a logical representation for the OES cluster represented in the example above:
The Node Group contains three physical nodes (Node X, Node Y, and Node Z) and one virtual nodes (Node V1). The virtual node contains the shared resources (VOL1 and VOL2). Logically then, the cluster group simply contains four nodes: Node X, Node Y, Node Z, and Node V1. Each of the four nodes contains one or more storage pools or disks.
All shared resources are viewed by DPX as local resources of the virtual node. With this structure, ensures that backups of the shared resources are performed through the virtual node and backups of local resources are performed through the physical nodes.
This concept is illustrated by the following extract from a Backup File window.
In this depiction:
OES-CLUSTER is the node group
cluster is the virtual cluster node
V1: is a shared resource
oes-lx-c1, oes-lx-c2, and oes-lx-c2 are physical nodes.
If a physical cluster node fails during backup of a shared resource, continues to execute the backup by retrying the task through the failover node.
