HP Surestore 64 HP Surestore Director FC-64 Product Manager User's Guide - Page 126

Configure Operating Parameters Use the procedures in this section to configure the following Fibre Channel operating parameters using the Configure Operating Parameters dialog box. Ordinarily, you do not need to change these values from their defaults. The only exception is the Preferred Domain ID. Change this value if the director will participate in a multiswitch 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 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). 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). 110 Configure Operating Parameters