Clustering and fabric zoning
If you plan to use clustering, install and configure the clustering software on the servers.
Clustering is the organization of multiple servers into groups. Within a cluster, each server is a node.
Multiple clusters compose a multi-cluster environment. The following example shows a multi-cluster
environment with three clusters, each containing two nodes. The nodes share access to the disk array.
Figure 3 Multi-cluster environment
.
Within the Storage Area Network (SAN), the clusters may be homogeneous (all the same operating
system) or they may be heterogeneous (mixed operating systems). How you configure LUN security
and fabric zoning depends on the operating system mix and the SAN configuration.
Fabric zoning and LUN security for multiple operating systems
You can connect multiple clusters with multiple operating systems to the same switch and fabric using
appropriate zoning and LUN security as follows:
• Storage port zones can overlap if more than one operating system needs to share an array port.
• Heterogeneous operating systems can share an array port if you set the appropriate host group
and mode. All others must connect to a dedicated array port.
• Use LUN Manager for LUN isolation when multiple hosts connect through a shared array port.
LUN Manager provides LUN security by allowing you to restrict which LUNs each host can access.
Table 3 Fabric zoning and LUN security settings
LUN SecurityFabric ZoningOS MixEnvironment
Must be used when mul-
tiple hosts or cluster nodes
connect through a shared
port
Not required
homogeneous (a single OS type
present in the SAN)
Standalone SAN
(non-clustered)
Clustered SAN
Multi-Cluster SAN
Required
heterogeneous (more than one OS
type present in the SAN)
P9000 Configuration Guide: IBM AIX 13
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