HP Surestore 64 Planning Guide - Page 93

Principal, Default, Never Principal, Never, Fabric WWN assignment, Domain ID assignment

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At least one switch in a multiswitch fabric needs to be set as Principal or Default. If all switches are set to Never Principal, all of the interswitch links (ISLs) will segment. If all but one switch is set to Never Principal and the switch that was Principal goes offline, then all of the other ISLs will segment. Note It is recommended to configure the switch priority as Default. In the audit log, note 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 2-253 are not used. • Fabric WWN assignment The Fabric Manager application identifies fabrics using a fabric WWN. The fabric WWN is the same as the WWN of the fabric's principal switch. If a new principal switch is selected because of a change to the fabric topology, the fabric WWN changes to the WWN of the newly-selected principal switch. • Domain ID assignment Each director in a multiswitch fabric is identified by a unique domain ID that ranges between 1 and 31. A domain ID of 0 is invalid. Domain IDs are used in 24-bit Fibre Channel addresses that uniquely identify source and destination ports in a fabric. Each director is configured through the Product Manager application with a preferred domain ID. When a director powers on and comes online, it requests a domain ID from the fabric's principal switch (indicating its preferred value as part of the request). If the requested domain ID is not allocated to the fabric, the domain ID is assigned to the requesting director. If the requested domain ID is already allocated, an unused domain ID is assigned. If two operational fabrics join, they determine if any domain ID conflicts exist between the fabrics. If one or more conflicts exist, the interconnecting ISL E_Ports segment to prevent the fabrics from joining. To prevent this problem, it is recommended that all directors be assigned a unique preferred domain ID. This is particularly important if zoning is implemented through port number (and by default domain ID) rather than WWN. Planning Considerations Multiswitch Fabric Support 79

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Multiswitch Fabric Support
79
Planning Considerations
At least one switch in a multiswitch fabric needs to be set as
Principal
or
Default
. If all
switches are set to
Never Principal
, all of the interswitch links (ISLs) will segment. If
all but one switch is set to
Never
Principal
and the switch that was
Principal
goes
offline, then all of the other ISLs will segment.
Note
It is recommended to configure the switch priority as
Default
.
In the audit log, note 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 2-253 are not used.
•
Fabric WWN assignment
The Fabric Manager application identifies fabrics using a fabric WWN. The fabric WWN
is the same as the WWN of the fabric
’
s principal switch. If a new principal switch is
selected because of a change to the fabric topology, the fabric WWN changes to the
WWN of the newly-selected principal switch.
•
Domain ID assignment
Each director in a multiswitch fabric is identified by a unique domain ID that ranges
between 1 and 31. A domain ID of 0 is invalid. Domain IDs are used in 24-bit Fibre
Channel addresses that uniquely identify source and destination ports in a fabric.
Each director is configured through the Product Manager application with a preferred
domain ID. When a director powers on and comes online, it requests a domain ID from
the fabric
’
s principal switch (indicating its preferred value as part of the request). If the
requested domain ID is not allocated to the fabric, the domain ID is assigned to the
requesting director. If the requested domain ID is already allocated, an unused domain
ID is assigned.
If two operational fabrics join, they determine if any domain ID conflicts exist between
the fabrics. If one or more conflicts exist, the interconnecting ISL E_Ports segment to
prevent the fabrics from joining. To prevent this problem, it is recommended that all
directors be assigned a unique preferred domain ID. This is particularly important if
zoning is implemented through port number (and by default domain ID) rather than
WWN.