HP SN6000 User's Guide download pdf (Page 110)

82 Fabric OS Command Reference

53-1003108-01

bottleneckMon

Per-port overrides for alert parameters

Custom configuration for the above mentioned alert parameters. The

abbreviations "C" and "L" indicate "congestion" and "latency" alerts. "Y" means

alerts are enabled for both types, and "N" means alerts are disabled.

Excluded ports

List of ports excluded from bottleneck detection.

Credit recovery on backend ports

Use the --cfgcredittools commands to enable or disable credit recovery of backend ports and to display

the configuration. When this feature is enabled, credit is recovered on backend ports (ports connected to

the core blade or core blade backend ports) when credit loss has been detected on these ports. If

complete loss of credit on a Condor2 backend port causes frame timeouts, a link reset will be performed

on that port regardless of the configured setting, even if that setting is -recover off. When used with the

-recover onLrOnly option, the recovery mechanism takes the following escalating actions:

• When it detects credit loss, it performs a link reset and logs a RASlog message (RAS Cx-1014).

• If the link reset fails to recover the port, the port reinitializes. A RASlog message is generated (RAS

Cx-1015). Note that the port reinitialization does not fault the blade.

• If the port fails to reinitialize, the port is faulted. A RASlog message (RAS Cx-1016) is generated.

• If a port is faulted and there are no more online backend ports in the trunk, the core blade is faulted.

(Note that the port blade will always be faulted). A RASlog message is generated (RAS Cx-1017).

When used with the -recover onLrThresh option, recovery is attempted through repeated link resets

and a count of the link resets is kept. If the threshold of more than two link resets per hour is reached, the

blade is faulted (RAS Cx-1018). Note that regardless of whether the link reset occurs on the port blade or

on the core blade, the port blade is always faulted.

If you suspect complete credit loss on a particular virtual channel (VC) on a particular backend port, use

the -check option to examine that particular backend port and VC for credit loss. If the command detects

complete credit loss, it reports the information. If, in addition, you have enabled link resets on backend

ports, this command will perform a link reset on the link in an attempt to recover from the problem. You

must explicitly initiate this check and it is a one-time operation. In other words, this command does not

continuously monitor for credit loss in the background. Detection of credit loss takes 2-7 seconds, after

which the results of the operation are displayed. A Link Reset also generates a RASlog message.

For more information on the RASlog messages, refer to the Fabric OS Message Reference.

NOTES Command syntax predating Fabric OS v6.4.0 is no longer supported as of Fabric OS v7.0.0.

The execution of this command is subject to Virtual Fabric or Admin Domain restrictions that may be in

place. Refer to Chapter 1, "Using Fabric OS Commands" and Appendix A, "Command Availability" for

details.

The bottleneck detection commands are supported on F_Ports, FL_Ports, E_Ports, and EX_Ports.

The credit recovery commands are supported only on backend ports of Condor, Condor 2, and Condor

3-based blades in the Brocade DCX 8510-8 and DCX 8510-4 chassis.

The -check option is supported only on modular switches, and only on links between Condor 2 core

blades and Condor 2 port blades. AP blades are not supported.

All credit recovery-related options are also available with the creditRecovMode command as of Fabric

OS v7.2.0.

All credit recovery options will be deprecated from the bottleneckMon command in a future Fabric OS

release because these options are already made available in the creditRecovMode command.

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