Veritas Volume Manager 5.0.1 Release Notes, HP-UX 11i v3, First Edition, November 2009

vxdmpadm command, enables you to sort the output based on path name, DMP node
name, enclosure name, or host controller name.
— Enhanced I/O Statistics
The following enhancements are now made to the I/O statistics:
◦ Queued and Erroneous I/O counts
The vxdmpadm iostat show command now provides options to display queued
I/O counts (using the -q option) and erroneous I/O counts (using the -e option).
These options are applicable for the DMP node, path, and controller.
◦ Filtering Zero Entries
The vxdmpadm iostat show command now provides the -z option to filter
entities for which all data entries are zero. This option is especially useful in a
cluster environment, when many paths are required for failover capabilities but
the paths are not being used for I/O.
◦ Specifying Units for Statistics Data
You can now specify the units in which the statistics data is displayed using the k,
m, and g arguments with the -u option. The -u option accepts the k, m, and g
arguments to display throughput in kilo-, mega-, and giga-system blocks,
respectively. The us argument displays average read/write time in microseconds.
By default, the read/write times are displayed in milliseconds up to 2 decimal
places. The throughput data is displayed in terms of BLOCKS and the output is
scaled. The small values are displayed in small units and the larger values are
displayed in bigger units, retaining significant digits constant. The arguments to
the -u option now enables you to display throughput in exact number of bytes.
◦ Cumulative I/O Statistics
The vxdmpadm iostat command now contains a groupby clause to provide
cumulative I/O statistics listing for every DMP node, controller, array port ID,
host-array controller pair, and enclosure. If you do not specify the groupby clause,
the statistics are displayed for every path.
◦ Miscellaneous Improvements to DMP I/O Statistics
The following improvements have been made to the DMP I/O statistics output:
– The method to calculate average read/write time has been corrected.
– By default, the average read/write time is displayed in milliseconds up to two
places after the decimal point. You can use the new –u us option to display
the average read/write time in microseconds.
– The average I/O size is set to 512 bytes.
– The vxdmpadm iostat show command now displays full names for disks
with target WWN. If the output exceeds 80 columns, the output is wrapped.
NOTE: The I/O statistics and their enhancements are available only with the VxVM-full
license.
— Making DMP Restore Options Persistent
The restore policy, restore interval, and restore period are now persistent across reboots.
In addition to being set as options to the vxdmpadm start restore command, these
attributes can also be set using the vxdmpadm settune command. The new tunables
are dmp_restore_policy, dmp_restore_interval, and dmp_restore_cycles.
Additionally, a new tunable dmp_enable_restore is available that enables the path
restoration thread to be started.
New Features in This Release 7