A set of nodes is designated as an availability set during the configuration of the HP XC System Software. These nodes provide failover and failback functionality. One node in the availability set is typically the primary provider for the service. When the availability tool senses that the node has failed, the other node in the availability set assumes the function of that service for the same availability tool.
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 | NOTE: For the HP Serviceguard availability tool, each availability set becomes an HP Serviceguard cluster. |
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A node must be exclusive to its availability set; that is, a node cannot be assigned to more than one availability set for the same availability tool.
The following sections provide information on determining which nodes comprise an availability set, reimaging nodes in an availability set, and reconfiguring an availability set.
Determining Which Nodes Are in the Availability Set |
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Use the shownode config hostgroups command to list the nodes in the availability sets.
# shownode config hostgroups
hostgroups:
headnode: n16
serviceguard:avail1: n15
n16
serviceguard:avail2: n13
n14
serviceguard:avail3: n11
n12 |
This example shows three availability sets: avail1, avail2, and avail3.
Reconfiguring an Availability Set |
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Run the transfer_from_avail command, then the cluster_config utility to modify your availability sets.
This example illustrates the use of the cluster_config utility to select HP Serviceguard as the availability tool and assigns nodes n7 and n8 to an availability set:
# transfer_from_avail
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# cd /opt/hptc/config/sbin
/opt/hptc/config/sbin
# ./cluster_config |
The HP XC System Software Installation Guide describes the cluster_config utlity in detail.
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