VERITAS File System 4.1 Administrator's Guide

Glossary
local mounted file system
Glossary 261
fragmentation The on-going process on an
active file system in which the file system is
spread further and further along the disk,
leaving unused gaps or fragments between
areas that are in use. This leads to degraded
performance because the file system has
fewer options when assigning a file to an
extent.
G
GB Gigabyte (230 bytes or 1024 megabytes).
H
hard limit The hard limit is an absolute
limit on system resources for individual
users for file and data block usage on a file
system. See also quota.
I
indirect address extent An extent that
contains references to other extents, as
opposed to file data itself. A single indirect
address extent references indirect data
extents. A double indirect address extent
references single indirect address extents.
indirect data extent An extent that
contains file data and is referenced via an
indirect address extent.
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
also quotas and external quotas file.
K
Kilobyte Kilobyte (210 bytes or 1024 bytes).
L
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
two terabytes. VxFS supports file systems up
to 8 hexabytes 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.
local mounted file system A file system
mounted on a single host. The single host
mediates all file system writes to storage
from other clients. To be a local mount, a file
system cannot be mounted using the mount
-o cluster option. See also cluster mounted
file system.