Interop Mode - HP StorageWorks 2/140 - Director Switch Product Manager Manual

Configuring the Director
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 offline, 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, refer to the section on principal switch
selection for multiswitch fabrics in the hp StorageWorks high availability planning guide for
details.
In, for example, 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

Choose one of the following options:
• Homogeneous Fabric—Choose this mode if the fabric contains only HP directors
and switches that are operating in Homogeneous Fabric mode.
• Open Fabric 1.0—Default. Choose this mode if the fabric contains HP directors
and switches, as well as other open-fabric compliant switches. Choose this mode
for managing heterogeneous fabrics.
3–8 director product manager user guide