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

Glossary
node join
Glossary240
node join The process through which a node joins a
cluster and gains access to shared disks.
O
object location table (OLT) The information
needed to locate important file system structural
elements. The OLT is written to a fixed location on
the underlying media (or disk).
object location table replica A copy of the OLT in
case of data corruption. The OLT replica is written
to a fixed location on the underlying media (or
disk).
P
page file A fixed-size block of virtual address
space that can be mapped onto any of the physical
addresses available on a system.
preallocation A method of allowing an application
to guarantee that a specified amount of space is
available for a file, even if the file system is
otherwise out of space.
primary fileset The files that are visible and
accessible to the user.
Q
Quick I/O file A regular VxFS file that is accessed
using the ::cdev:vxfs: extension.
Quick I/O for Databases Quick I/O is a VERITAS
File System feature that improves database
performance by minimizing read/write locking and
eliminating double buffering of data. This allows
online transactions to be processed at speeds
equivalent to that of using raw disk devices, while
keeping the administrative benefits of file systems.
quotas Quota limits on system resources for
individual users for file and data block usage on a
file system. See also hard limit and soft limit..
quotas file The quotas commands read and write
the external quotas file to get or change usage
limits. When quotas are turned on, the quota limits
are copied from the external quotas file to the
internal quotas file. See also quotas, internal
quotas file, and external quotas file..
R
reservation An extent attribute used to preallocate
space for a file.
root disk group A special private disk group that
always exists on the system. The root disk group is
named rootdg.
S
shared disk group A disk group in which the disks
are shared by multiple hosts (also referred to as a
cluster-shareable disk group).
shared volume A volume that belongs to a shared
disk group and is open on more than one node at the
same time.
snapshot file system An exact copy of a mounted
file system at a specific point in time. Used to do
online backups.
snapped file system A file system whose exact
image has been used to create a snapshot file
system.