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

See the Storage Foundation Release Notes for additional details of the features

that are supported in this release.

■ Veritas Volume Manager can be used instead of LVM to manage the root disk.

Basic volume management capabilities are included in the operating system.

■ Veritas Volume Manager is integrated with HP ServiceGuard and ServiceGuard

OPS Edition for High Availability, but requires a specific version of the

ServiceGuard products. Refer to the Release Notes for details about the required

version number, as well as the availability of specific features in your release.

Notable features of VxVM

The Veritas Volume Manager provides many features, some of which are not

available with LVM or MirrorDisk/UX. This section describes notable VxVM

features.

See the Storage Foundation Release Notes for additional details of the features

that are supported in this release.

See other Veritas Volume Manager documentation for additional details about

using these features.

Veritas Volume Manager includes the following features:

■ Concatenation, the combining of discontiguous disk regions into virtual devices.

■ Spanning, concatenation across different physical media.

■ Striping, distribution of storage mappings for a virtual device so that

multi-threaded accesses tend to cause even use of all physical media.

■ The Veritas Enterprise Administrator (VEA), which is a JAVA-based GUI for

VxVM.

■ Dynamic Multipathing (DMP) for Active/Passive and Active/Active devices.

DMP provides higher availability to data on disks with multiple host-to-device

pathways by providing a device path failover mechanism. If one connection

to a disk is lost, the system continues to access the data over the other available

connections to the disk.

DMP can also provide improved I/O performance from disks with multiple

pathways that are concurrently available. DMP can balance the I/O load

uniformly across the multiple paths to the disk device.

DMP can coexist with the native multipathing functionality that is provided

in HP-UX 11i Version 3.

DMP also supports the new persistent device file names in addition to legacy

device file names and enclosure-based names.

■ Free Space Management, providing simple goal-based allocation of storage.

VxVM and LVM

Introducing Veritas Volume Manager