Blue Arc Titan SiliconServer, Руководство системного администратора

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Storage Management
174 Titan SiliconServer
To Delete a File System Quota
On the Quotas by File Systems page, select the quota or quotas to be deleted by using the
checkboxes to the left of the quotas’ names. Then, click delete .
Using Virtual Volumes
Virtual Volumes are a simple way to manage directory trees in a File System. Titan treats the
directory that is at the ‘root’ of the Virtual Volume, together with all its sub-directories, as a self-
contained File System. The Virtual Volume will keep track of its usage of space and number of
files, to provide a way of monitoring File System usage. This tracking allows restrictions, called
quotas, to be imposed on the levels of disk space usage as well as the total number of files.
Quotas can be imposed for the entire Virtual Volume, including individual users, and groups of
users. Where many users or groups will have access to a Virtual Volume, a set of Quota Defaults
can be defined. In the absence of
explicit user or group quotas, default quotas apply.
Note: In this section, the terms ‘user’ and ‘group’ are used to indicate NFS
or CIFS users and groups.
Understanding Virtual Volumes
Virtual Volumes are directory trees that are treated as self-contained file systems and used to
monitor and control File System usage.
Note: When it comes to 'moving' or 'hard linking' files, Virtual Volumes
behave the same as real File System volumes. Moving or linking files across
different Virtual Volumes returns a 'cross volume link' error. For a move
operation, most CIFS or NFS clients will suppress this error and, instead,
will copy the files to the target location and delete the original ones.
Virtual Volumes have the following characteristics:
• Name: a name or ‘label’ by which the Virtual Volume is identified. This will often be the
same as a CIFS share or NFS export rooted at the Virtual Volume’s root directory.
• File System: the File System in which the Virtual Volume is created
• Path: the directory at the ‘root’ of the Virtual Volume
• Email Contacts: a list of Email addresses, to which information and alerts about Virtual
Volume activity are sent. The list can also be used to send emails to individual users.
Important information about Virtual Volumes:
• While quotas keep track of used disk space and number of files, neither File System
metadata nor snapshot files count towards the quota limits.
• Files with multiple hard links are included only once. A symbolic link adds the size of the
symbolic link file to a quota and not the size of the file to which it links.