HP StorageWorks 64 - SAN Director Switch Planning Manual page 87

■
SAN High Availability Planning Guide
— Incompatible zoning configurations — Zoning configurations for the
two fabric elements are not compatible. For an explanation, refer to
"Configuring Zones" on page 133.
— Build fabric protocol error — A protocol error is detected during the
process of forming the fabric.
— No principal switch — No director or switch in the fabric is capable of
becoming the principal switch.
— No response from attached switch — After a fabric is created, each
element in the fabric periodically verifies operation of all attached
switches and directors. An ISL segments if a director or switch does not
respond to a verification request.
— ELP retransmission failure timeout — A director or switch that
exhibits a hardware failure or connectivity problem cannot transmit or
receive Class F frames. The director or switch did not receive a response
to multiple exchange link parameters (ELP) frames, did not receive a
fabric login (FLOGI) frame, and cannot join an operational fabric.
Fabric services and state change notifications — In a multi-switch fabric,
services provided by each director or switch (such as name service, registered
state change notifications [RSCNs], and zoning) are provided on a fabric-wide
basis. For example, if a fabric-attached device queries a director or switch
name server to locate all devices that support a specified protocol, the reply
includes all fabric devices that support the protocol that are in the same zone
as the requesting device, not just devices attached to the director or switch.
RSCNs are transmitted to all registered device N_Ports attached to the fabric
if either of the following occur:
— A fabric-wide event occurs, such as a director or switch logging in to the
fabric, a director or switch logging out of the fabric, or a reconfiguration
because of a director, switch, or ISL failure.
— A zoning configuration changes.
Planning Considerations for Fibre Channel Topologies
87