EMC Connectrix DS-32M2, User Manual

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5
5-8 Connectrix DS-32M2 User Guide
Configuring the Switch
To enable extended distance operation on a port, it is not necessary to
change the BB_Credit value for the entire switch. You can enable
extended distance on a port-by-port basis without taking the entire
switch off line.
By enabling the extended distance feature on a port, you are setting
the individual port BB_Credit to 60. Refer to 10-100Km on page 5-13
for details on enabling this option.
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. Set a value in the range
10
through 1200 (tenths of a second, or 1 through 120 seconds). (The
default value is 100 tenths, or 10 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. Set a value in the range 2 through 600
(tenths of a second, or 0.2 through 60 seconds). (The default value is
20
tenths, or 2 seconds.)
EMC recommends leaving the timeout values at their defaults. These are the
defaults used for all HBA and Symmetrix microcode testing for both benign
and fault injection cases.
Preferred Domain ID Use this field to set each director and switch in the fabric to a unique
Domain ID. Fibre Channel addresses in the switch include this
Preferred Domain ID, which creates a unique identification for the
port in the fabric.
Set a Preferred Domain ID value in the range 1 through 31.
(The default value is 1.)
The Domain ID must be unique for each director/switch in a fabric. If
two directors/switches have the same Domain ID, the E_Ports (and
the fabric) become segmented.