HP Surestore 64 fw 05.01.00 and sw 07.01.00 - Director Product Manager - User - Page 126

Switch Priority, Interop Mode, Principal, Default, Never Principal

Page 126 highlights

Configuring the Director Switch Priority Setting this value determines the principal director for the multiswitch fabric. Choose Principal (highest priority), Default, or Never Principal (lowest priority) from the Switch Priority drop-down 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 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 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 Choose one of the following options: 126 Director Product Manager User Guide

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Configuring the Director
126
Director Product Manager User Guide
Switch Priority
Setting this value determines the principal director for the multiswitch fabric.
Choose
Principal
(highest priority),
Default
, or
Never Principal
(lowest
priority) from the
Switch Priority
drop-down 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 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 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
Choose one of the following options: