Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

464 VERITAS Volume Manager Administrator’s Guide
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.
RAID
A Redundant Array of Independent Disks (RAID) is a disk array set up with part of the
combined storage capacity used for storing duplicate information about the data stored in
that array. This makes it possible to regenerate the data if a disk failure occurs.
read-writeback mode
A recovery mode in which each read operation recovers plex consistency for the region
covered by the read. Plex consistency is recovered by reading data from blocks of one plex
and writing the data to all other writable plexes.
root configuration
The configuration database for the root disk group. This is special in that it always
contains records for other disk groups, which are used for backup purposes only. It also
contains disk records that define all disk devices on the system.
root disk
The disk containing the root file system. This disk may be under VxVM control.
root file system
The initial file system mounted as part of the UNIX kernel startup sequence.
root partition
The disk region on which the root file system resides.
root volume
The VxVM volume that contains the root file system, if such a volume is designated by the
system configuration.