HP JFS 3.3 and HP OnLineJFS 3.3 VERITAS File System 3.3 System Administrator's Guide

122 Chapter7
Quotas
Quotas File on VxFS
Quotas File on VxFS
A quotas file (named quotas) must exist in the root directory of a file
system for any of the quota commands to work. This is a BSD quotas
implementation requirement, and is also applicable to VxFS quotas. The
quotas file in the root directory is referred to as the external quotas
file. VxFS also maintains an internal quotas file for its internal use.
The quota administration commands read and write the external quotas
file to get or change usage limits. The internal quotas file is used 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 as well as changes to quotas are
registered in the internal quotas file. When quotas are turned off, the
contents of the internal quotas file are flushed into the external quotas
file so that all data is in sync between the two files.