Using Virtual Volumes
System Administration Manual
179
3.
On clicking
delete,
a warning will displayed asking for confirmation that this action is
definitely required. Click
OK
to continue deleting the Virtual Volumes.
Note:
A Virtual Volume can only be removed from a directory when the
directory is empty. To delete a Virtual Volume which is assigned to a
directory that contains data, first remove the data, then delete the Virtual
Volume.
Managing Quotas on Virtual Volumes
There are three types of quotas that are maintained for each Virtual Volume:
1.
Explicit User/Group Quotas
A quota can be explicitly created to impose restrictions on an individual user or group,
defining a unique set of thresholds.
2.
Default User/Group Quotas
Quotas can be set automatically for all users and groups that do not have explicit
quotas. This is done by defining a set of thresholds (‘Quota Defaults’), which will be used
to create a quota automatically when a file is created or modified in the Virtual Volume.
Default quotas for Virtual Volumes operate in the same manner as those defined for File
Systems. User (Group) Quota Defaults are a set of thresholds used to create a quota for
a user (group) the first time that user (group) saves a file in the file system.
Initially, these Quota Defaults are set to zero (i.e. ‘not set’). When activity occurs in the
Virtual Volume, although it is tracked, no quotas are created. Quota Defaults are defined
by setting at least one threshold to a non-zero value. Default Quotas will then be
automatically created. As soon as a set of Quota Defaults is defined in this way, a User
or Group Quota (as appropriate) will be created for the owner of the directory at the root
of the Virtual Volume.
3.
Virtual Volume Quotas
A Virtual Volume Quota tracks the space used within a specific directory on the file
system. A quota can be explicitly created to define a set of thresholds restricting all
operations in the Virtual Volume, irrespective of which user or group initiated them.
Quotas track the number and total size of all files. When these reach specified thresholds,
emails are sent to alert the list of contacts associated with the File System and, optionally,
Quota Threshold Exceeded
events
are logged. Operations that would take the user or group
beyond the configured limit can be disallowed by setting
hard limits
.
Note:
When both Usage and File Count limits are defined, Titan will enforce
whichever is the first quota to be reached.