958-000289-003, March 2005)

Director 2/64 installation guide 71

The Configure Fabric Parameters dialog box appears (Figure 45).

Figure 45 Configure Fabric Parameters dialog box

3. Use information under ”Fabric parameters” to change settings as required for parameters in this

dialog box.

4. After you change settings, click Activate.

5. Back up the configuration data when you are finished configuring the switch.

6. Set the director online. For instructions, see ”Setting the director online” on page 65.

Fabric parameters

Configure the following parameters as required by your fabric.

BB_Credit

Configure the director to support buffer-to-buffer credit (BB_Credit) from 1 through 60. This is the

value used for all ports, except those configured for extended distance buffering (10-100 km). The

default value is 16. For a description of the buffer-to-buffer credit, refer to the industry specification,

Fibre Channel physical and signaling interface.

R_A_TOV

Configure resource allocation time-out value (R_A_TOV) in tenth-of-a-second increments. This

variable works with the error detect time-out value (E_D_TOV) variable to control the director’s

behavior when an error condition occurs. Resources are allocated to a circuit when errors are

detected and are not released for reuse until the time set by the R_A_TOV value expires. The default

value is 100 tenths (10 seconds). Set a value between 10 tenths and 1200 tenths (1 through 120

seconds).

NOTE: Set the same value for R_A_TOV on all directors and edge switches in a multi-switch fabric.

If the value is not the same on all units, the fabric segments. Also, the value for R_A_TOV must be

greater than the value configured for E_D_TOV.

E_D_TOV

Adjust the E_D_TOV in tenth-of-a-second increments. An error condition occurs when an expected

response is not received within the time limit set by this value. The default value is 20 tenths (2

seconds). Set a value between 2 tenths through 600 tenths (.2 through 60 seconds).