See Figure 58 (page 162).
Risks
• Single path failure may result in loss of data accessibility and loss of host data that has not
been written to storage.
• Controller shutdown results in loss of data accessibility and loss of host data that has not been
written to storage.
NOTE: For additional risks, see Table 62 (page 166).
Limitations
• HP Continuous Access EVA is not supported with single path configurations.
• Single path HBA server is not part of a cluster.
• Booting from the SAN is not supported.
Figure 58 IBM AIX Configuration
5 SAN switch 11 Network interconnection
6 SAN switch 22 Single HBA server
7 Controller A3 Dual HBA server
8 Controller B4 Management server
VMware configuration
Requirements
• Switch zoning or controller level SSP must be used to ensure each single path HBA has an
exclusive path to its LUNs.
• All nodes with direct connection to a disk must have the same access paths available to them.
• Single path HBA server can be in the same fabric as servers with multiple HBAs.
• In the use of snapshots and snapclones, the source virtual disk and all associated snapshots
and snapclones must be presented to the single path hosts that are zoned with the same
controller. In the case of snapclones, after the cloning process has completed and the clone
becomes an ordinary virtual disk, you may present that virtual disk as you would any other
ordinary virtual disk.
162 Single Path Implementation
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