HP StorageWorks 4000/6000/8000 - Enterprise Virtual Arrays, Reference Manual

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NOTE:
When enabling a new configuration, HP strongly recommends that the fabric be quiesced. Zone
membership should not be changed for devices that are actively performing I/O in a fabric. Once
the new zoning is enabled, an RSCN is sent to all nodes that have been registered to receive the
RSCN.
The following sections provide information to help you successfully merge SAN fabrics:
• Fabric segmentation errors , page 426
• Switch configuration parameters , page 426
• Independent fabric merge , page 427
• High-availability redundant fabric merge , page 427
Fabric segmentation errors
The following errors can cause fabric segmentation:
• Zone type mismatch
The name of a zone object in one fabric is identical to the name of a different type of zone object
in the other fabric. For example, an object name on fabric A must not be an alias or configuration
name in fabric B; otherwise, the fabrics cannot merge.
• Zone content mismatch
The definition of a zone object in one fabric is different from its definition in the other fabric. If an
alias, zone, or configuration name is the same on both fabric A and B, but the content or definition
of the objects is different, the fabrics cannot merge.
• Zone configuration mismatch
Zoning is enabled for both fabrics, but the zone configurations are different. The fabrics cannot
merge until the zone configuration is disabled for one of the fabrics.
• Duplicate IDs
Each switch in a fabric must have a unique domain ID; each switch in multiple fabrics of the SAN
must also have a unique ID. For example, if fabric A has five switches with domain IDs 1 through
5, and fabric B has five switches with the same domain IDs, these two fabrics cannot merge until
each switch in both fabrics has a unique domain ID.
For port-level zoning, changing the domain IDs can disrupt device access. Port-level zones are
based on the domain ID and port number.
Switch configuration parameters
Mismatched switch parameters can cause a SAN merger to fail. The configuration settings for all
switches in the fabric must match, with the exception of the following parameters:
• Switch name
• IP address
• Domain ID
Best practices 426