Veritas Storage Foundation Portable Data Containers: Cross-Platform Data Sharing 5.0.1 Administrators Guide, HP-UX 11i v3, First Edition, November 2009
object group A group of objects of the same type. Each object group has a group icon and a
group name. In VxVM, object groups include disk groups, disks, volumes,
controllers, free disk pool disks, uninitialized disks, and file systems.
object tree A dynamic hierarchical display of Veritas Volume Manager objects and other
objects on the system. Each node in the tree represents a group of objects of the
same type.
platform block Data placed in sector 0, which contains OS-specific data for a variety of platforms
that require its presence for proper interaction with each of those platforms. The
platform block allows a disk to masquerade as if it was initialized by each of the
specific platforms.
plex A copy of a volume and its data. There can be several plexes per volume. The terms
mirror and plex are used synonymously.
private region A region of a physical disk used to store private, structured VxVM information.
The private region contains a disk header, a table of contents, and a configuration
database. The table of contents maps the contents of the disk. The disk header
contains a disk ID. All data in the private region is duplicated for extra reliability.
public region A region of a physical disk managed by VxVM that contains available space and
is used for allocating subdisks.
sector size Sector size is an attribute of a disk drive (or SCSI LUN for an array-type device),
which is set when the drive is formatted. Sectors are the smallest addressable unit
of storage on the drive, and are the units in which the device performs I/O.
subdisk A set of contiguous disk blocks that form a logical disk segment. Subdisks are
associated with plexes (mirrors) to form volumes.
uninitialized disks Disks that are not under VxVM control.
volume A virtual disk or entity that is made up of portions of one or more physical disks.
VxFS Veritas File System.
VxVM Veritas Volume Manager.
VxVM ID block Data on disk that indicates the disk is under VxVM control. The VxVM ID Block
provides dynamic VxVM private region location, GUID, and other information.
71Glossary