Veritas File System 5.1 SP1 Administrator"s Guide (5900-1499, April 2011)

inode A unique identifier for each file within a file system that contains the data and
metadata associated with that file.
inode allocation unit A group of consecutive blocks containing inode allocation information for a given
fileset. This information is in the form of a resource summary and a free inode
map.
intent logging A method of recording pending changes to the file system structure. These changes
are recorded in a circular intent log file.
internal quotas file VxFS maintains an internal quotas file for its internal usage. The internal quotas
file maintains counts of blocks and indices used by each user. See quotas and
external quotas file.
K Kilobyte (2
10
bytes or 1024 bytes).
large file A file larger than two terabytes. VxFS supports files up to 8 exabytes in size.
large file system A file system larger than one terabytes. VxFS supports file systems up to 8 exabytes
in size.
latency For file systems, this typically refers to the amount of time it takes a given file
system operation to return to the user.
metadata Structural data describing the attributes of files on a disk.
MB Megabyte (2
20
bytes or 1024 kilobytes).
mirror A duplicate copy of a volume and the data therein (in the form of an ordered
collection of subdisks). Each mirror is one copy of the volume with which the
mirror is associated.
multi-volume file
system
A single file system that has been created over multiple volumes, with each volume
having its own properties.
MVS Multi-volume support.
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).
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.
quotas Quota limits on system resources for individual users for file and data block usage
on a file system. See hard limit and soft limit.
245Glossary