Technical data

This is the preferred address, but the HSG80 controller is free to use
whatever AL_PA it obtains during loop initialization. However, the
address you specify must be valid and must not be used by another
port. If the controller is unable to obtain the address you specify (for
example, because two ports are configured for the same address), the
controller cannot come up on the loop.
In particular, if you do not set
PORT_x_AL_PA, multiple ports might
attempt to use the default address, thus causing a conflict.
The valid AL_PA addresses are within the range of 0-EF (hexadecimal),
but not all addresses within this range are valid; the default value is 69
(hexadecimal).
The list of valid AL_PA addresses is as follows:
0x01, 0x02, 0x04, 0x08, 0x0F, 0x10, 0x17, 0x18, 0x1B, 0x1D,
0x1E, 0x1F, 0x23, 0x25, 0x26, 0x27, 0x29, 0x2A, 0x2B, 0x2C,
0x2D, 0x2E, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x39, 0x3A,
0x3C, 0x43, 0x45, 0x46, 0x47, 0x49, 0x4A, 0x4B, 0x4C, 0x4D,
0x4E, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x59, 0x5A, 0x5C,
0x63, 0x65, 0x66, 0x67, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E,
0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x79, 0x7A, 0x7C, 0x80,
0x81, 0x82, 0x84, 0x88, 0x8F, 0x90, 0x97, 0x98, 0x9B, 0x9D,
0x9E, 0x9F, 0xA3, 0xA5, 0xA6, 0xA7, 0xA9, 0xAA, 0xAB, 0xAC,
0xAD, 0xAE, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB9, 0xBA,
0xBC, 0xC3, 0xC5, 0xC6, 0xC7, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD,
0xCE, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD9, 0xDA, 0xDC,
0xE0, 0xE1, 0xE2, 0xE4, 0xE8, 0xEF
In multiple-bus failover mode, each port must have a unique AL_PA
address because all of the ports can be active at the same time.
The convention in transparent failover mode is to use the same AL_PA
address for Port 1 on both controllers and the same AL_PA address for
Port 2 on both controllers. This allows the standby port on the alternate
controller to have the same AL_PA address in the event of a failover.
Because the ports are not active at the same time, the AL_PA addresses
do not conflict. Make sure that the AL_PA address assigned to Port 1
is not the same as that assigned to Port 2, because they are distinct
devices on the Fibre Channel loop.
The following example sets the PORT_x_AL_PA value for ports on two
HSG80 controllers in multiple-bus failover mode:
HSG80> set this PORT_1_AL_PA = 01
HSG80> set this PORT_2_AL_PA = 02
HSG80> set other PORT_1_AL_PA = 04
HSG80> set other PORT_2_AL_PA = 08
The following example sets the PORT_x_AL_PA value for ports on two
HSG80 controllers in transparent failover mode:
HSG80> set this PORT_1_AL_PA = 01
HSG80> set this PORT_2_AL_PA = 02
HSG80> set other PORT_1_AL_PA = 01
Using Fibre Channel Storage 6–49