Fabric parameters, Bb_credit, R_a_tov – HP StorageWorks 2.32 Edge Switch User Manual
Page 83: E_d_tov, Switch priority
Edge Switch Element Manager user guide
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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.