HP HSG Array Controller - Manual (Page 121)

6-14 StorageWorks Fibre Channel Storage Switch User's Guide
Compaq Confidential – Need to Know Required
Writer: Bill Reitz Project: StorageWorks Fibre Channel Storage Switch User's Guide Comments:
Part Number: AA-RHBYA-TE 135267-001 File Name: g-ch6 Zoning Last Saved On: 4/7/99 12:36 PM
Adding a New Fabric
Adding a new Fabric (a Fabric where there is no zone configuration
information) to an existing Zoned Fabric is similar to adding a new Switch. All
Switches in the new Fabric inherit the zone configuration data. If a zone
configuration is enabled, then the same configuration becomes enabled in the
new Switches. After this operation, cfgShow displays the same output on all
Switches in the joined Fabric, including the new Switches.
Merging Two Fabrics
If two Fabrics that have zone configuration information are joined it is more
complex. The Zoning software attempts to merge the two zone configurations.
The simplest and safest case is where both Fabrics have identical zone
configuration data and the same configuration is enabled. In this case, the
Fabrics join to make one larger Fabric with the same zone configuration in
effect across the whole new Fabric.
If the Fabrics have different zone configuration data, then the two sets of
information are merged if possible, or the Inter Switch Link (ISL) is
segmented if a merge is not possible. Merging is not possible if:
■ Zoning is enabled in both Fabrics and the zone configuration that is
enabled is different (cfg mismatch)
■ The name of a zone object in one Fabric is used for a different type of
zone object in the other Fabric (type mismatch)
■ The definition of a zone object in one Fabric is different from its
definition in the other Fabric (content mismatch).
When this condition is detected by the Switches between the ISL, each Switch
displays an error message on its LCD, Telnet console and syslog.
Splitting a Fabric
If an ISL goes down, causing a Fabric to split into two separate Fabrics, then
each new Fabric retains the same zone configuration.
If the ISL is replaced and no changes have been made to the zone
configuration in either new Fabric, then the two Fabrics are guaranteed to
merge back into one single Fabric. If changes have been made to either zone
configuration, then the rules under Merging Two Fabrics apply.