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

24 Understanding Veritas Volume Manager
How VxVM handles storage management
host and one of the hubs. In this example, each disk is known by the same name to VxVM
for all of the paths over which it can be accessed. For example, the disk device enc0_0
represents a single disk for which two different paths are known to the operating system,
such as c1t99d0 and c2t99d0.
To take account of fault domains when configuring data redundancy, you can control how
mirrored volumes are laid out across enclosures as described in “Mirroring across targets,
controllers or enclosures” on page 247.
Figure 1-4 Example HA configuration using multiple hubs or switches to provide
redundant loop access
See “Disk device naming in VxVM” on page 78 and “Changing the disk-naming scheme”
on page 92 for details of the standard and the enclosure-based naming schemes, and how
to switch between them.
Virtual objects
Virtual objects in VxVM include the following:
■ Disk groups
■ VM disks
■ Subdisks
■ Plexes
■ Volumes
c2c1
Host
Fibre Channel hub
s
or switches
Disk enclosures
enc0 enc1 enc2