FW V06.XX/HAFM SW V08.02.00 HP StorageWorks Director Element Manager User Guide (AA-RTDUC-TE, July 2004)

Configuring the Director
123Director Element Manager User Guide
3. Use information in the next section, “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 director.
6. Set the director online. For instructions, see the “Set Director Online State”
bullet on page 74.
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 will become 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 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 switches in a multiswitch
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).