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Press Enter.
3. Select Devices.
Gigabit Fibre Channel Adapter Configuration
To configure the Gigabit Fibre Channel (FC) Adapter, do the following:
1. Select the FC Adapter section.
FC Adapter Configurable Options are displayed on the screen.
2. Select Change/Show Characteristics.
A list of configurable FC Adapter options is displayed.
Change/Show Characteristics of a FC Adapter
Type or select values in entry fields.
Press Enter AFTER making all desired changes.
FC Adapter
Description
Status
Location
Maximum number of COMMANDS to queue to the adapter [200]+#
Maximum Transfer Size
Preferred AL_PA
INIT Link flags
Apply change to DATABASE only
Configuration Options
The FC Adapter has the following configuration options:
v Maximum Number of Commands to Queue to the Adapter
v Maximum Transfer Size
v Preferred AL_PA
v INIT Link Flags (AIX Version 5.1 only)
Maximum Number of Commands to Queue to the Adapter: Use this option to adapt to various
memory/system conditions. The default is 200, but you can conserve memory at the expense of
performance by reducing this number to as low as 20. If you have sufficient memory, the maximum is
1024 for a Gigabit Fibre Channel PCI Adapter (Type 4-S). The maximum is 2048 for a 2 Gigabit Fibre
Channel Adapter for 64-bit PCI Bus (Type 4-W).
If the SCSI target device is connected to the host through a SAN Data Gateway (SDG), this parameter
cannot exceed the SDG limit of 240 (SAN Data Gateway is a SCSI-to-Fibre Channel bridge).
Maximum Transfer Size: The default is 256 kilobytes, which is the largest single transfer size. For tape,
transfers of 2 megabytes or more are possible. The range is 256 kilobytes to 16 megabytes.
Preferred AL_PA: The preferred AL_PA (Arbitrated Loop Physical Address) value is the address that the
adapter requests at the beginning of every LIP (Loop Initialization Process). This configuration option must
be used to set a unique AL_PA for each adapter in an Arbitrated Loop.
No two devices on a loop should have the same Preferred AL_PA. The outcome of arbitration would be
random and would result in permanent I/O errors.
Every device on a loop must have unique AL_PAs. To maximize efficiency, hosts must have low AL_PAs
for higher loop priorities. Targets must have higher AL_PAs for lower priorities.
[Entry Fields]
fcs0
FC Adapter
Available
20-58
[0x100000]+
[0x1]+
[al]+
no+
Chapter 5. Installing the Gigabit Fibre Channel PCI Adapter
17
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