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Do not activate this trace facility until you have read this section completely, and understand this material. If you are not certain how to properly use this facility, or if you are not under the guidance of IBM Service, do not activate this facility. Activating this facility may result in degraded performance of your system. Activating this facility may also result in longer response times, higher processor loads, and the consumption of system disk resources. Activating this facility may also obscure or modify the symptoms of timing-related problems. |
This trace is intended for IBM Service Personnel only. It is not intended for general user tracing. The virtual shared disk device driver maintains a circular trace buffer in the kernel. The default is to trace a minimum amount of information, but different levels of detail may be traced. This trace is local to each node. It is controlled by the vsdtrace command.
If full tracing is enabled, CPU utilization increases. The trace output may be viewed using the vsddump command. The output is displayed to stdout, or it may be sent to a file. If full tracing is enabled, the small circular buffer fills up and wraps quickly.
Trace records contain a timestamp, information about the source and target nodes, and the name of the routine that issued the trace information.
The IBM Recoverable Virtual Shared disk subsystem traces its activity to the console log. This trace shows rvsd responses to requests coming from: Group Services, the AIX System Resource controller, and the IBM Virtual Shared Disk device driver. This trace is local to each node.
A basic level of tracing is enabled by default, but more detail may be enabled or disabled with the ha.vsd trace on|off command. This trace has negligible impact on the system's performance and other resources. The console log must be directed to a file in order to capture the output of this trace. This log may grow rapidly, consuming space in the /var directory.
Trace records contain a timestamp and the name of the routine that issued the trace information.
The IBM Recoverable Virtual Shared Disk subsystem logs recovery information. This information is also logged to the console log, where you can see how recovery interacts with other system activities. Recovery actions are always logged.
This trace is local to each node. The log is located in: /var/adm/csd/vsd.log on each node. There is also a symbolic link to this file from: /var/adm/SPlogs/csd/vsd.log. This log is pre-allocated, and it is kept trimmed to the most recent 4000 lines. Trace records contain a timestamp and the name of the routine issuing the trace record.