HP Surestore 64 Planning Guide - Page 92

Principal, Default, Never Principal, Switch Priority

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Special consideration must also be given to devices that participate in frequent or critical data transfer operations. For example, in Figure 19, suppose device D7 is a server and device D9 is a storage unit and both devices participate in a critical nightly backup operation. It is recommended such a connection be routed directly through director S2 (rather than the entire fabric) through zoned port connections. • Zoning For multiswitch fabrics, zoning is configured on a fabric-wide basis. Changes to the zoning configuration apply to all directors in the fabric. To ensure the zoning configuration is maintained, be aware that certain rules are enforced when two or more directors are connected through ISLs to form a fabric, or when two or more fabrics are joined. For additional information, refer to Zoning configurations for joined fabrics on page 82. After directors are defined and physically cabled, they automatically join to form a single fabric through a user-transparent process. However, the user should be aware of the following fabric concepts, configuration characteristics, and operational characteristics: • Principal switch selection Setting this value determines the principal switch for the multiswitch fabric. Select either Principal (highest priority), Default, or Never Principal (lowest priority) from the Switch Priority drop-down list. If all switches are set to Principal or Default, the switch with the highest priority and the lowest WWN becomes the principal switch. Following are some examples of principal switch selection when switches have these settings. - If you have three switches and set all to Default, the switch with the lowest WWN become the principal switch. - If you have three switches and set two to Principal and one to Default, the switch with the Principal setting that has the lowest WWN becomes the principal switch. - If you have three switches and set two to Default and one to Never Principal, the switch with the Default setting and the lowest WWN becomes the principal switch. 78 Multiswitch Fabric Support

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78
Multiswitch Fabric Support
Special consideration must also be given to devices that participate in frequent or
critical data transfer operations. For example, in Figure 19, suppose device
D
7
is a
server and device
D
9
is a storage unit and both devices participate in a critical nightly
backup operation. It is recommended such a connection be routed directly through
director
S
2
(rather than the entire fabric) through zoned port connections.
•
Zoning
For multiswitch fabrics, zoning is configured on a fabric-wide basis. Changes to the
zoning configuration apply to all directors in the fabric. To ensure the zoning
configuration is maintained, be aware that certain rules are enforced when two or
more directors are connected through ISLs to form a fabric, or when two or more
fabrics are joined. For additional information, refer to
Zoning configurations for joined
fabrics
on page 82.
After directors are defined and physically cabled, they automatically join to form a single
fabric through a user-transparent process. However, the user should be aware of the
following fabric concepts, configuration characteristics, and operational characteristics:
•
Principal switch selection
Setting this value determines the principal switch for the multiswitch fabric. Select
either
Principal
(highest priority),
Default
, or
Never Principal
(lowest priority) from
the
Switch Priority
drop-down list.
If all switches are set to
Principal
or
Default
, the switch with the highest priority and
the lowest WWN becomes the principal switch. Following are some examples of
principal switch selection when switches have these settings.
–
If you have three switches and set all to
Default
, the switch with the lowest WWN
become the principal switch.
–
If you have three switches and set two to
Principal
and one to
Default
, the switch
with the
Principal
setting that has the lowest WWN becomes the principal switch.
–
If you have three switches and set two to
Default
and one to
Never Principal
, the
switch with the
Default
setting and the lowest WWN becomes the principal switch.