Fabric parameters, Bb_credit, R_a_tov – HP StorageWorks 2.32 Edge Switch User Manual

Page 83: E_d_tov, Switch priority

Fabric Parameters

Configure the following parameters as required by your fabric.

BB_Credit

(Edge Switch 2/32 only.) Buffer-to-buffer credit. This variable is used to set the maximum number of

frames a port can transmit without receiving a receive ready signal from the receiving device.

Values range from 1 through 60. This value is used for all ports, except those configured for

extended distance buffering (10-100 km). The default value is 16. For a description of

buffer-to-buffer credit, refer to the industry specification, Fibre Channel Physical and Signaling

Interface.

R_A_TOV

Resource allocation time-out value. This variable is used to time out operations that depend on the

maximum possible time that a frame can be delayed in a fabric and still be delivered. Adjust the

value for R_A_TOV in tenths of a second (100 ms) increments over a range of 10 tenths (1 second)

to 1200 tenths (120 seconds). The default value is 100 tenths (10 seconds).

NOTE:

Set the same value for R_A_TOV on all switches on 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

Error-detect time-out value. This defines the time that the switch waits for an expected response

before declaring an error condition. Configure this value in tenths of a second (100 ms) increments

in a range of 2 tenths of a second to 600 tenths (60 seconds). The default value is 20 tenths (2

seconds).

NOTE:

Set the same value for E_D_TOV on all switches on a multiswitch fabric. If the value is not

the same, the fabric segments.

Switch Priority

Setting this value determines the principal switch for the multiswitch fabric. Click either Principal

(highest priority), Default, or Never Principal (lowest priority) from the Switch Priority

drop-down list.
If all switches are set to Principal or Default, the switch with the highest priority and the lowest

WWN becomes the principal switch.

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