HP Fabric OS 7.1.0, Administrator'S Manual

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306 Fabric OS Administrator’s Guide
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Zoning overview
11
Zone objects
A zone object is any device in a zone, such as:
•
Physical port number or port index on the switch
•
Node World Wide Name (N-WWN)
•
Port World Wide Name (P-WWN)
Zone objects identified by port number or index number are specified as a pair of decimal numbers
in the form
D,I , where D is the domain ID of the switch and I is the index number on that switch in
relation to the port you want to specify.
For example, in Backbones, “4,30” specifies port 14 in slot number 2 (domain ID 4, port index 30).
On fixed-port models, “3,13” specifies port 13 in switch domain ID 3.
The following issues affect zone membership based on the type of zone object:
•
When a zone object is the physical port number, then all devices connected to that port are in
the zone.
•
World Wide Names are specified as 8-byte (16-digit) hexadecimal numbers, separated by
colons (:) for example, 10:00:00:90:69:00:00:8a.
•
When a zone object is the node WWN name, only the specified device is in the zone.
•
When a zone object is the port WWN name, only the single port is in the zone.
Alternative approaches
Application Zoning by application typically requires zoning multiple, perhaps incompatible, operating
systems into the same zones. This method of zoning creates the possibility that a minor server
in the application suite could disrupt a major server (such as a Web server disrupting a data
warehouse server). Zoning by application can also result in a zone with a large number of
members, meaning that more notifications, such as registered state change notifications
(RSCNs), or errors, go out to a larger group than necessary.
Operating
system Zoning by operating system has issues similar to zoning by application. In a large site, this type
of zone can become very large and complex. When zone changes are made, they typically
involve applications rather than a particular server type. If members of different operating
system clusters can see storage assigned to another cluster, they might attempt to own the
other cluster’s storage and compromise the stability of the clusters.
Port allocation Avoid zoning by port allocation unless the administration team has very rigidly enforced
processes for port and device allocation in the fabric. It does, however, provide some positive
features. For instance, when a storage port, server HBA, or tape drive is replaced, the change of
WWN for the new device is of no consequence. As long as the new device is connected to the
original port, it continues to have the same access rights. The ports on the edge switches can
be pre-associated to storage ports, and control of the fan-in ratio (the ratio of the input port to
output port) can be established. With this pre-assigning technique, the administrative team
cannot overload any one storage port by associating too many servers with it.
Not recommended
No fabric zoning Using no fabric zoning is the least desirable zoning option because it allows devices to have
unrestricted access on the fabric. Additionally, any device attached to the fabric, intentionally or
maliciously, likewise has unrestricted access to the fabric. This form of zoning should be utilized
only in a small and tightly controlled environment, such as when host-based zoning or LUN
masking is deployed.
TABLE 53 Approaches to fabric-based zoning (Continued)
Zoning approach Description