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Chapter
1
Understanding Veritas
Volume Manager
Veritas
TM
Volume Manager (VxVM) by Symantec is a storage management
subsystem that allows you to manage physical disks as logical devices called
volumes. A VxVM volume appears to applications and the operating system as a
physical disk on which file systems, databases and other managed data objects
can be configured.
VxVM provides easy-to-use online disk storage management for computing
environments and Storage Area Network (SAN) environments. By supporting
the Redundant Array of Independent Disks (RAID) model, VxVM can be
configured to protect against disk and hardware failure, and to increase I/O
throughput. Additionally, VxVM provides features that enhance fault tolerance
and fast recovery from disk failure.
VxVM overcomes physical restrictions imposed by hardware disk devices by
providing a logical volume management layer. This allows volumes to span
multiple disks.
VxVM provides the tools to improve performance and ensure data availability
and integrity. You can also use VxVM to dynamically configure disk storage
while the system is active.
The following sections of this chapter explain fundamental concepts of VxVM:
■ VxVM and the operating system
■ How VxVM handles storage management
■ Volume layouts in VxVM
The following sections introduce you to advanced features of VxVM:
■ Online relayout
■ Volume resynchronization
■ Dirty region logging