Veritas Volume Manager 5.0.1 Release Notes HP-UX 11i v3 (5900-0033, August 2011)

Following are the enhancements to the DMP feature:
◦ Dynamic Multipathing Attributes Now Persistent
Dynamic Multipathing attributes are now persistent across reboots. These attributes include
standby, active, preferred, primary, secondary, nopreferred, and
nomanual. Use the vxdmpadm setattr command to set the attributes. The attributes
are stored in the /etc/vx/dmppolicy.info file.
◦ Improved Dynamic Multipathing Device Naming
The DMP device naming feature has been enhanced to provide a consistent and user
friendly approach for naming DMP devices.
The following enhancements apply regardless of the specified naming scheme:
– DMP now enables you to assign customized names for DMP devices. You can specify
customized names for individual devices or you can use a file containing user-defined
names to assign multiple names.
– You can specify a DMP device name to commands using the name of any of its
subpaths. The output displays the assigned DMP device name.
– In a symmetric cluster, the DDL-generated enclosure-based names for DMP devices
are now consistent across all nodes in the cluster.
– You can now make device names persistent. This is the default behavior for the
enclosure-based naming (EBN) scheme. DDL generates the device name in the
enclosure_index format. If you specify the use_avid argument, the device
name is generated using the Array Volume ID for the index number to provide a
meaningful device name.
◦ Default Behavior Modified for I/O Throttling
By default, DMP is now configured without I/O throttling. In previous releases, I/O
throttling was set to on. You can use the vxdmpadm setattr command with the
recoveryoption keyword to configure I/O throttling for DMP.
◦ Specifying a Minimum Number of Active Paths
You can now configure the minimum redundancy level, which is the minimum number of
paths for the devices in an enclosure. Use the redundancy option of the vxdmpadm
getdmpnode command to display any devices that have fewer than the minimum number
of paths. You can also configure DMP to notify when the number of active paths becomes
below the configured minimum number of paths.
◦ Enhanced Listing of Subpath
The vxdmpadm getsubpaths command now provides the ability to list all subpaths
known to DMP, subpaths of an enclosure, or subpaths through an array port or pwwn.
To list the paths through an array port, specify either a combination of enclosure name
and array port ID, or the array port WWN.
The default listing of the vxdmpadm getsubpaths command is sorted by the enclosure
name, then by the DMP node and within that by pathname. The new -s option, for the
vxdmpadm command, enables you to sort the output based on path name, DMP node
name, enclosure name, or host controller name.
New Features in This Release 5