Overview: The Next Generation Mass Storage Stack (September 2009)

PowerPath PowerPath does not manage multi-pathing on HP-UX 11i v3. Native multi-pathing is used
for EMC devices. For information on migrating from PowerPath to native multi-pathing,
see the HP-UX 11i v2 to 11i v3 Mass Storage Stack Update Guide in For More
Information
.
Dynamic Multipathing VERITAS Dynamic Multipathing (DMP) does not support the agile view. See the VERITAS
Volume Manager 4.1 Administrator's Guide for information about the coexistence of
DMP with native multi-pathing in HP-UX 11i v3.
VERITAS File System
In HP-UX 11i v3, the maximum tested file system size for VERITAS File System (VxFS) 4.1 is 32 TB, subject to size
restrictions imposed by any underlying volume manager. For example, LVM supports a maximum volume size of
16 TB, so the maximum size of a VxFS 4.1 file system under LVM is 16 TB. For additional information on
supported file system sizes, see the white paper Supported File and File System Sizes for HFS and JFS, available
at the HP Business Support Center website at
http://www.hp.com/go/hpux-core-docs (Click HP-UX 11i v3).
VERITAS Volume Manager
VERITAS Volume Manager (VxVM) 4.1 is supported on HP-UX 11i v3 but it does not support the agile view. Only
legacy DSFs are supported.
Virtual Partitions
Virtual Partitions (vPars) A.05.01 does not support the use of lunpath hardware paths or lun hardware paths on
the vPars command line. When using the vPars commands to specify hardware paths, use the legacy hardware
path format. However, after a virtual partition is created, you can use the agile view on that partition.
Migrating to the Agile View
This section describes how to migrate from the legacy view to the agile view. It includes the benefits of migration,
compatibility and coexistence of the two views, and the migration process.
Benefits of Migration
The next generation mass storage stack provides numerous advantages over previous releases. They include the
following:
Ease of Use • Agile addressing, so SAN reconfiguration does not affect DSF binding
• Automatic detection and configuration of new LUNs
• Transparent native multi-pathing of LUNs, using a single DSF and hardware path for all
lunpaths
• Integration of multi-pathing with boot and dump subsystems
• Full backward compatibility in legacy mode
• Tools to aid migration to agile view
Manageability
• New scsimgr command for managing and troubleshooting mass storage
• Reduction in number of DSFs
• Integration with system management GUIs (SMH and SIM)
• Improved performance tracking tools
Scalability • Increased architectural and tested limits
• Increased parallelism to take advantage of large multi-CPU server configurations
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