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

See “About quota files on Veritas File System” on page 78.
The quota soft limit can be exceeded when VxFS preallocates space to a file. Quota
limits cannot exceed two terabytes on a Version 5 disk layout.
See “About extent attributes” on page 63.
About quota files on Veritas File System
A quotas file (named quotas) must exist in the root directory of a file system for
any of the quota commands to work. The files in the file system's mount point are
referred to as the external quotas file. VxFS also maintains an internal quotas file
for its own use.
The quota administration commands read and write to the external quotas file to
obtain or change usage limits. VxFS uses the internal file to maintain counts of
data blocks and inodes used by each user. When quotas are turned on, the quota
limits are copied from the external quotas file into the internal quotas file. While
quotas are on, all the changes in the usage information and changes to quotas are
registered in the internal quotas file. When quotas are turned off, the contents
of the internal quotas file are copied into the external quotas file so that all data
between the two files is synchronized.
About quota commands
Most of the quotas commands in VxFS are similar to BSD quotas commands. In
general, quota administration for VxFS is performed using commands similar to
HFS quota commands. The VxFS mount command supports a special mount option
(-o quota), that can be used to turn on quotas at mount time.
For additional information on the quota commands, see the corresponding manual
pages. In general, quota administration for VxFS is similar to that of BSD quotas.
Note: When VxFS file systems are exported via NFS, the VxFS quota commands
on the NFS client cannot query or edit quotas. You can use the VxFS quota
commands on the server to query or edit quotas.
Using quotas
The VxFS quota commands are used to manipulate quotas.
Quotas
About quota files on Veritas File System
78