Veritas Volume Manager 5.0.1 Administrator's Guide, HP-UX 11i v3, First Edition, November 2009

Table 16-2
DMP parameters that are tunable (continued)
DescriptionParameter
The level of detail that is displayed for DMP console
messages. The following level values are defined:
1 — Displays all DMP log messages that existed in releases
before 5.0.
2 — Displays level 1 messages plus messages that relate to
path or disk addition or removal, SCSI errors, IO errors and
DMP node migration.
3 — Displays level 1 and 2 messages plus messages that
relate to path throttling, suspect path, idle path and insane
path logic.
4 — Displays level 1, 2 and 3 messages plus messages that
relate to setting or changing attributes on a path and tunable
related changes.
The default value is 1.
dmp_log_level
Retry period for handling transient errors. The value is
specified in seconds.
When all paths to a disk fail, there may be certain paths that
have a temporary failure and are likely to be restored soon.
The I/Os may be failed to the application layer even though
the failures are transient, unless the I/Os are retried. The
dmp_lun_retry_timeout tunable provides a mechanism
to retry such transient errors.
If the tunable is set to a non-zero value, I/Os to a disk with
all failed paths are retried until dmp_lun_retry_timeout
interval or until the I/O succeeds on one of the path,
whichever happens first.
The default value of tunable is 0, which means that the paths
are probed only once.
dmp_lun_retry_timeout
Performance monitoring and tuning
Tuning VxVM
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