Deployment Guide

System configuration parameters
You must disable the switch before you can configure fabric parameters.
You can change the following system configuration parameters:
• Switch fabric settings
• Virtual channel settings
• Arbitrated loop parameters
• System services
• CSCTL QoS mode settings
• Signed firmware
WWN-based persistent PID assignment
WWN-based PID assignment allows you to configure a PID persistently using a device’s WWN. When
the device logs in to the switch, the PID is bound to the device WWN. If the device is moved to another
port in the same switch, or a new blade is hot-plugged, the device receives the same PID (area) at its
next login. For information on configuring WWN-based PID assignment, refer to Configuring fabric
settings on page 63.
This feature is deactivated by default. When the feature is enabled, bindings are created dynamically;
as new devices log in, they automatically enter the WWN-based PID database. The bindings exist until
you explicitly unbind the mappings through the CLI or change to a different addressing mode. If there
are any existing devices when you enable the feature, you must manually enter the WWN-based PID
assignments through the CLI.
Once WWN-based PID assignment is enabled, you must manually enter the WWN-based PID
assignments through the CLI for any existing devices. Any new devices logging in are automatically
entered in the WWN-based PID database. Current WWN-based PID bindings are cleared when you
change to a different addressing mode.
PID assignments are supported for a maximum of 4096 devices; this includes both point-to-point and
NPIV devices. The number of point-to-point devices supported depends directly on the areas
available. For example, 448 are available on an enterprise-class platform and 256 are available on
switches. When the number of entries in the WWN-based PID database reaches the number 4096 or
areas are used up, the oldest unused entry is purged from the database to free up the reserved area
for the new FLOGI. Refer to the following table for complete information.
Switches that support WWN-based persistent PID on Web ToolsTABLE 8
Platform VF Default switch Logical
switch
Area mode FICON mode
DCX/DCX-4S
DCX 8510-4
DCX 8510-8
Enabled
Yes, if dynamic area
addressing is enabled
in the default switch.
Yes
0 If 8-bit dynamic
mode is enabled,
FMS is not supported
1 Can be set
2 Not supported
System configuration parameters
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