Veritas Volume Manager 5.0 Administrator's Guide (September 2006)

71Understanding Veritas Volume Manager
Hot-relocation
completed. For more information, see the vxvol (1M), vxassist (1M), and
vxplex (1M) manual pages.
Hot-relocation
Note: You need a full license to use this feature.
Hot-relocation is a feature that allows a system to react automatically to I/O failures on
redundant objects (mirrored or RAID-5 volumes) in VxVM and restore redundancy and
access to those objects. VxVM detects I/O failures on objects and relocates the affected
subdisks. The subdisks are relocated to disks designated as spare disks and/or free space
within the disk group. VxVM then reconstructs the objects that existed before the failure
and makes them accessible again.
When a partial disk failure occurs (that is, a failure affecting only some subdisks on a
disk), redundant data on the failed portion of the disk is relocated. Existing volumes on the
unaffected portions of the disk remain accessible. For further details, see “Administering
hot-relocation” on page 369.
Volume sets
Note: You need a full license to use this feature.
Volume sets are an enhancement to VxVM that allow several volumes to be represented
by a single logical object. All I/O from and to the underlying volumes is directed via the I/
O interfaces of the volume set. The volume set feature supports the multi-volume
enhancement to Veritas File System (VxFS). This feature allows file systems to make best
use of the different performance and availability characteristics of the underlying volumes.
For example, file system metadata could be stored on volumes with higher redundancy,
and user data on volumes with better performance.
For more information about creating and administering volume sets, see “Creating and
administering volume sets” on page 353.