958-000289-003, March 2005)

Installing and configuring the director72

NOTE: Set the same value for E_D_TOV on all switches and directors in a multi-switch fabric. If the

value is not the same, the fabric segments.

Switch priority

Setting this value determines the principal director for the multi-switch fabric. Select Principal

(highest priority), Default, or Never Principal (lowest priority) from the Switch Priority list.

Setting these priority values determines the principal director selected for the multi-switch 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. The 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 multi-switch 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: HP recommends 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

multi-switch fabrics in the HP StorageWorks SAN high availability planning guide 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 options:

• Homogeneous Fabric—Select this mode if the fabric contains only HP directors and edge

switches that are operating in Homogeneous Fabric mode.

• Open Fabric 1.0—Default. Select this mode if the fabric contains HP directors and edge

switches, as well as other open-fabric compliant switches. Select this mode for managing

heterogeneous fabrics.