HP Surestore 64 - Director Switch User Manual page 127

Set the same value for E_D_TOV on all directors and directors in a multiswitch fabric.
If the value is not the same, the fabric segments.
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Preferred Domain ID
Use this field to set each director in the fabric to a unique preferred domain ID. Fibre
Channel addresses in the director include this preferred domain ID to create a unique
identification for the port in the fabric. The default value is 1. Set a preferred value
from 1 through 31.
The preferred domain ID must be unique for each director and switch in a fabric. If two
directors or directors have the same preferred domain ID, the E_Ports segment,
causing the fabric to segment.
Note For more information on domain ID, refer to the section on domain ID
assignment for multiswitch fabrics in the hp surestore director fc-64 Planning
Guide ( HP A6534-90903) .
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Switch Priority
Setting this value determines the principal switch for the multiswitch fabric. Select
Principal (highest priority), Default, or Never Principal (lowest priority) from the
Switch Priority drop-down list.
Setting these priority values determines the principal switch 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 switch in the fabric.
Configure Operating Parameters 111