HP Serviceguard Storage Management Suite Version A.02.00 for HP-UX 11i v3 Release Notes, 2nd Edition, September 2008

• Faster Startup Time — the time it takes to start the VxVM configuration daemon (vxconfigd)
for device discovery, to initialize dynamic multipathing, and to import disk groups has been
significantly reduced
• Faster Cluster Node Joins
• Remote Mirror Improvements
• Dynamic Multipathing (DMP) Enhancements:
— faster failure detection and recovery - the vxdmpadm command can be used to adjust
the I/O error recovery and I/O throttling mechanisms on individual paths
— the values of most DMP tunables can be set using the vxdmpadm settune command
— retry period for Persistent Group Reservations (PGR)
— retry period for handling transient errors
• Linked Break-off Snapshot Volumes — a new variant of the third-mirror break-off snapshot
• Volume Tag Changes — volumes can be tagged with an arbitrary tag name and an optional
tag value - multiple tags can be associated with a single volume
• Disk Tag Changes — disks can be tagged with an arbitrary tag name and optional tag value
- multiple tags can be associated with a single disk.
• Data Migration Enhancement — the vxassist, vxevac and vxsd commands have been
enhanced to allow data to be migrated at the volume, disk or subdisk level respectively
• Raw I/O Access — a mechanism is provided to allow access to the raw device nodes of the
component volumes of a volume set
• Increased Maximum Number of Component Volumes in a Volume Set — the maximum
number of component volumes in a volume set has been increased to 2048
• Cloned Disk Import Improvements — the vxdisk and vxdg commands have been enhanced
to allow cloned disks to be identified, and more easily managed
• Intelligent Storage Provisioning (ISP) Enhancements:
— the vxassist command can be used instead of the vxvoladm command to create ISP
volumes as well as non-ISP volumes - any vxassist specification attributes are
converted into equivalent ISP rules
— creation of a large number of volumes in a single operation, and retrieval of information
have been speeded up
— annotation of storage devices can be performed by assigning tags and optional tag
values to disks and LUNs
— the vxassist printrules or vxvoladm printrules commands can be used to
display the raw set of ISP rules that were used to allocate storage to a volume
— a specified number of volumes with a given intent can be created at the same time
— the vxtemplate listtemplate command can be used to support queries such as:
◦ Given a template, return all template sets that refer to that template
◦ Given a template, list all the templates on which the specified template is dependent
— the linked break-off snapshot volume feature allows the ISP feature to support fast
resynchronization (FastResync) with snapshot operations such as refresh and restore
— migration between non-ISP and ISP volumes
— the ISP intent version number has been increased to 30
• Config Backup and Restore — allows the disk group configuration to be backed up and
restored if configuration information is lost or corrupted
• Multipathing — If HP-UX native multipathing is configured instead of Veritas DMP (Dymanic
Multipathing) with VxVM or CVM disk groups on HP-UX 11i v3, data corruption may occur.
Since DMP is enabled by default for all VxVM and CVM disk groups, no additional
configuration is required to enable DMP, and HP-UX native multipathing will be ignored
by VxVM and CVM disk groups. If patches PHCO_38235, PHKL_38236, PHKL_38241, and
PHKL_38260 are installed, HP-UX native multipathing is supported with VxVM only.
14 HP Serviceguard Storage Management Suite Version A.02.00 for HP-UX 11i v3 Release Notes