Dell PowerVault 56F Dell PowerVault 56F 16-Port Fibre Channel Switch Inst - Page 66

Domain, BB credit, R_A_TOV, E_D_TOV, Data field size, Non-SCSI Tachyon, Disable Device, Probing

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Page 66 highlights

A listing of the configurable fabric parameters is shown in Table 4-5. Domain BB credit R_A_TOV E_D_TOV Data field size Non-SCSI Tachyon Mode Disable Device Probing The domain number uniquely identifies the switch in a fabric and may be any value between 1 and 239. Normally, this value is automatically assigned by the fabric. The buffer-to-buffer (BB) credit represents the number of buffers, in a range from 1 to 16, available to the host. For a complete description of this value, refer to the industry specification Fibre Channel Physical and Signaling Interface (FC-PH). The Resource Allocation Time Out Value (R_A_TOV) is displayed in milliseconds. This variable works with the variable E_D_TOV to determine the switch's actions when presented with an error condition. Allocated circuit resources with detected errors are not released until the time out value has expired. If the condition is resolved prior to the time out, the internal time out clock resets and waits for the next error condition. Error Detect Time Out Value (E_D_TOV) is displayed in milliseconds. This timer is used to flag a potential error condition when an expected response is not received (an acknowledgment or reply in response to packet receipt, for example) within the set time limit. If the time for an expected response exceeds the set value, then an error condition is met. This specifies the largest possible value, in bytes, for the size of a type 1 (data) frame. The switch advertises this value to other switches in the fabric during construction of the fabric as well as to other devices when they connect to the fabric. Setting this field to a value smaller than 2112 may result in decreased performance. When set, multiple sequences from different sources are interleaved to Tachyon-based controllers at sequence boundaries rather than at frame boundaries, resulting in better performance from Tachyon-based controllers. Set this mode when there are no Tachyon-based small computer systems interface (SCSI) host adapters connected to the fabric. When this is set, devices that do not register themselves with the Name Server are not present in the Name Server database. Set this mode only if the switch's N_Port discovery process (PLOGI, PRLI, INQUIRY) causes some attached device to fail. 4-10 Installation and Troubleshooting Guide

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4-10
Installation and Troubleshooting Guide
A listing of the configurable fabric parameters is shown in Table 4-5.
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Domain
The domain number uniquely identifies the switch in a fabric
and may be any value between 1 and 239. Normally, this
value is automatically assigned by the fabric.
BB credit
The buffer-to-buffer (BB) credit represents the number of
buffers, in a range from 1 to 16, available to the host. For a
complete description of this value, refer to the industry
specification Fibre Channel Physical and Signaling Interface
(FC-PH).
R_A_TOV
The Resource Allocation Time Out Value (R_A_TOV) is dis-
played in milliseconds. This variable works with the variable
E_D_TOV to determine the switch's actions when presented
with an error condition.
Allocated circuit resources with detected errors are not
released until the time out value has expired. If the condition
is resolved prior to the time out, the internal time out clock
resets and waits for the next error condition.
E_D_TOV
Error Detect Time Out Value (E_D_TOV) is displayed in milli-
seconds. This timer is used to flag a potential error condition
when an expected response is not received (an acknowledg-
ment or reply in response to packet receipt, for example)
within the set time limit. If the time for an expected
response exceeds the set value, then an error condition is
met.
Data field size
This specifies the largest possible value, in bytes, for the
size of a type 1 (data) frame. The switch advertises this
value to other switches in the fabric during construction of
the fabric as well as to other devices when they connect to
the fabric. Setting this field to a value smaller than 2112 may
result in decreased performance.
Non-SCSI Tachyon
Mode
When set, multiple sequences from different sources are
interleaved to Tachyon-based controllers at sequence bound-
aries rather than at frame boundaries, resulting in better
performance from Tachyon-based controllers. Set this mode
when there are no Tachyon-based small computer systems
interface (SCSI) host adapters connected to the fabric.
Disable Device
Probing
When this is set, devices that do not register themselves
with the Name Server are not present in the Name Server
database. Set this mode only if the switch's N_Port discov-
ery process (PLOGI, PRLI, INQUIRY) causes some attached
device to fail.