VERITAS Storage Foundation 4.1 Cross-Platform Data Sharing Administrator's Guide

58 VERITAS Storage Foundation CDS Administrator’s Guide
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.