Configure Fabric Operating Parameters - HP 316095-B21 - StorageWorks Edge Switch 2/24 User Manual

Configuring the Switch

Configure Fabric Operating Parameters

Use the procedures in this section to configure the following Fibre Channel operating
parameters using the Configure Fabric Parameters dialog box. The operating
parameters are stored in NV-RAM on the switch.
You can configure the following fabric operating parameters as required by your
fabric:
• 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 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
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 millisecond) 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 multi-switch fabric. If the value is
not the same, the fabric segments.
• Switch Priority
Setting this value determines the principal switch for the multi-switch fabric.
Select either Principal (highest priority), Default, or Never Principal (lowest
priority) from the Switch Priority drop-down list.
Changed all this because of new switch priority options.
If all switches are set to Principal or Default, the switch with the highest priority
and the lowest WWN becomes the principal switch. Following are some examples
of principal switch selection when switches have these settings.
— If you have three switches and set all to Default, the switch with the lowest
WWN become the principal switch.
— If you have three switches and set two to Principal and one to Default, the
switch with the Principal setting that has the lowest WWN becomes the
principal switch.
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