Veritas Volume Manager 5.0 Migration Guide, HP-UX 11i v3, First Edition, May 2008

8 VxVM and LVM
Introducing Veritas Volume Manager
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. Notable VxVM features are described in
the list below. See the Release Notes for a more detailed list of features available
in each Veritas Volume Manager product. See the other Veritas Volume
Manager documents for more 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. In the event of a loss of one connection to a disk, 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 concurrently available pathways by balancing 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.
■ Task Monitor, which tracks the progress of system recovery by
monitoring task creation, maintenance, and completion. The Task
Monitor allows you to pause, resume, and stop as desired to adjust the
impact on system performance.
■ Multiple mirroring with up to 32 mirror copies of a volume’s address
space.