Switch priority, Interop mode, Configuring preferred path – HP StorageWorks 2.140 Director Switch User Manual
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Configuring the director
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Switch Priority
Setting this value determines the principal director for the multiswitch fabric. Click Principal (highest
priority), Default, or Never Principal (lowest priority) on the Switch Priority list.
Setting these priority values determines the principal director selected for the multiswitch fabric. For
example, if you have three directors in the fabric and set one as Principal, one as Default, and one
as Never Principal, the unit set to Principal becomes the principal director in the fabric.
If all directors are set to Principal or Default, the director with the highest priority and the lowest
WWN becomes the principal director. Following are some examples of principal director selection
when directors have these settings:
•
If you have three directors and set all to Default, the director with the lowest WWN becomes
the principal director.
•
If you have three directors and set two to Principal and one to Default, the director with the
Principal setting that has the lowest WWN becomes the principal director.
•
If you have three directors and set two to Default and one to Never Principal, the director with
the Default setting and the lowest WWN becomes the principal director.
At least one director in a multiswitch fabric needs to be set as Principal or Default. If all of the
directors are set to Never Principal, all of the interswitch links (ISLs) will segment. If all but one
director is set to Never Principal and the director that was principal goes off line, then all of the
other ISLs will segment.
NOTE:
We recommend you leave the switch priority setting as Default. If you are considering
setting this value to something other than default, see the section on principal switch selection for
multiswitch fabrics in the SAN Environment Planning Manual for details.
For example, in the audit log, you may notice that the Principal setting maps to a number code of 1,
Default maps to a number code of 254, and Never Principal maps to a number code of 255. The
number codes of 2–253 are not currently in use.
Interop mode
Select one of the following modes:
•
Homogeneous Fabric—Select this mode if the fabric contains only HP directors and switches that
are operating in Homogeneous Fabric mode.
•
Open Fabric 1.0—Default. Select this mode if the fabric contains HP directors and switches, as
well as other Open-fabric compliant switches. Select this mode for managing heterogeneous
fabrics.
Configuring preferred path
For complete procedures on configuring this optional feature, see ”