VERITAS Volume Manager 3.5 Migration Guide (August 2002)

Introducing the VERITAS Volume Manager Final 24 July 2002
2 VERITAS Volume Manager Migration Guide
◆ The VERITAS Volume Manager is integrated with HP MC/ServiceGuard and
ServiceGuard OPS Edition for High Availability, but requires a specific version of the
ServiceGuard products. Refer to the VERITAS Volume Manager 3.5 for HP-UX 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 VERITAS Volume Manager 3.5 for HP-UX Release Notes for a more detailed list of
features available in each VERITAS Volume Manager product. See the other VERITAS
Volume Manager documents (listed under “Related Documents”in the “Preface”) 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 Volume Manager Storage Administrator, vmsa, a JAVA-based GUI
for VxVM. The Storage Administrator runs either asan application orfrom aweb
browser.
◆ Dynamic Multipathing (DMP) for active-passive devices, such as Model FC30
and FC60. DMP provides higher availability to data on disks with multiple
host-to-device pathways by providing a disk/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.
◆ 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.
The following VERITAS Volume Manager features require an additional license (product
B9116AA):
◆ Dynamic Multipathing (DMP) for active-active devices, such as HP Surestore
Disk Array xp256, HP Surestore Disk System FC10 and other disk devices. DMP
provides higher availability to data on disks with multiple host-to-device
pathways by providing a disk/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 also provides in some cases,