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-<?xml version='1.0' encoding='UTF-8'?>
-<!-- This document was created with Syntext Serna Free. --><!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "docbookV4.5/docbookx.dtd" []>
-<chapter id="chap-Administration_Guide-Dir_Quota">
- <title>Managing Directory Quota </title>
- <para>Directory quotas in GlusterFS allow you to set limits on usage of disk space by directories or volumes.
-The storage administrators can control the disk space utilization at the directory and/or volume
-levels in GlusterFS by setting limits to allocatable disk space at any level in the volume and directory
-hierarchy. This is particularly useful in cloud deployments to facilitate utility billing model.
- </para>
- <para> <note>
- <para>For now, only Hard limit is supported. Here, the limit cannot be exceeded and attempts to use
-more disk space or inodes beyond the set limit will be denied.
-</para>
- </note></para>
- <para>System administrators can also monitor the resource utilization to limit the storage for the users
-depending on their role in the organization.
-</para>
- <para>You can set the quota at the following levels:
- </para>
- <itemizedlist>
- <listitem>
- <para>Directory level – limits the usage at the directory level
- </para>
- </listitem>
- <listitem>
- <para>Volume level – limits the usage at the volume level
- </para>
- </listitem>
- </itemizedlist>
- <note>
- <para>You can set the disk limit on the directory even if it is not created. The disk limit is enforced
-immediately after creating that directory. For more information on setting disk limit, see <xref linkend="chap-Administration_Guide-Dir_Quota-Set_Replace"/>.
-</para>
- </note>
- <section id="chap-Administration_Guide-Dir_Quota-Enable">
- <title>Enabling Quota </title>
- <para>You must enable Quota to set disk limits.
-</para>
- <para><emphasis role="bold">To enable quota</emphasis>
-</para>
- <itemizedlist>
- <listitem>
- <para>Enable the quota using the following command:
-</para>
- <para><command># gluster volume quota <replaceable>VOLNAME</replaceable> enable </command></para>
- <para>For example, to enable quota on test-volume:
-</para>
- <programlisting># gluster volume quota test-volume enable
-Quota is enabled on /test-volume</programlisting>
- </listitem>
- </itemizedlist>
- </section>
- <section id="chap-Administration_Guide-Dir_Quota-Disable">
- <title>Disabling Quota </title>
- <para>You can disable Quota, if needed.
-</para>
- <para><emphasis role="bold">To disable quota:</emphasis>
-</para>
- <itemizedlist>
- <listitem>
- <para>Disable the quota using the following command:
-</para>
- <para><command># gluster volume quota <replaceable>VOLNAME</replaceable> disable </command></para>
- <para>For example, to disable quota translator on test-volume:
-</para>
- <programlisting># gluster volume quota test-volume disable
-Quota translator is disabled on /test-volume</programlisting>
- </listitem>
- </itemizedlist>
- </section>
- <section id="chap-Administration_Guide-Dir_Quota-Set_Replace">
- <title>Setting or Replacing Disk Limit </title>
- <para>You can create new directories in your storage environment and set the disk limit or set disk limit for
-the existing directories. The directory name should be relative to the volume with the export
-directory/mount being treated as &quot;/&quot;.
-</para>
- <para><emphasis role="bold">To set or replace disk limit</emphasis>
-</para>
- <itemizedlist>
- <listitem>
- <para>Set the disk limit using the following command:
-</para>
- <para><command># gluster volume quota <replaceable>VOLNAME</replaceable> limit-usage /<replaceable>directory</replaceable><replaceable>limit-value</replaceable></command></para>
- <para>For example, to set limit on data directory on test-volume where data is a directory under the
-export directory:
-</para>
- <programlisting># gluster volume quota test-volume limit-usage /data 10GB
-Usage limit has been set on /data</programlisting>
- <para><note>
- <para>In a multi-level directory hierarchy, the strictest disk limit will be considered for enforcement.
-</para>
- </note></para>
- </listitem>
- </itemizedlist>
- </section>
- <section id="chap-Administration_Guide-Dir_Quota-Display">
- <title>Displaying Disk Limit Information </title>
- <para>You can display disk limit information on all the directories on which the limit is set.
-</para>
- <para><emphasis role="bold">To display disk limit information</emphasis>
-</para>
- <itemizedlist>
- <listitem>
- <para>Display disk limit information of all the directories on which limit is set, using the following
-command:
-</para>
- <para><command># gluster volume quota <replaceable>VOLNAME</replaceable> list</command>
-</para>
- <para>For example, to see the set disks limit on test-volume:
-</para>
- <programlisting># gluster volume quota test-volume list
-
-<emphasis role="underline">
- <emphasis role="underline"><emphasis role="underline">Path</emphasis>__________Limit______Set Size</emphasis>
- </emphasis>
-/Test/data 10 GB 6 GB
-/Test/data1 10 GB 4 GB</programlisting>
- </listitem>
- <listitem>
- <para>Display disk limit information on a particular directory on which limit is set, using the following
-command:
-</para>
- <para><command># gluster volume quota <replaceable>VOLNAME</replaceable> list <replaceable>/directory name</replaceable></command>
-</para>
- <para>For example, to see the set limit on /data directory of test-volume:</para>
- <programlisting># gluster volume quota test-volume list /data
-
-<emphasis role="underline"><emphasis role="underline">Path</emphasis>__________Limit______Set Size</emphasis>
-/Test/data 10 GB 6 GB</programlisting>
- </listitem>
- </itemizedlist>
- </section>
- <section id="chap-Administration_Guide-Dir_Quota-Update">
- <title> Updating Memory Cache Size </title>
- <para>For performance reasons, quota caches the directory sizes on client. You can set timeout indicating
-the maximum valid duration of directory sizes in cache, from the time they are populated.
-</para>
- <para>For example: If there are multiple clients writing to a single directory, there are chances that some
-other client might write till the quota limit is exceeded. However, this new file-size may not get
-reflected in the client till size entry in cache has become stale because of timeout. If writes happen
-on this client during this duration, they are allowed even though they would lead to exceeding of
-quota-limits, since size in cache is not in sync with the actual size. When timeout happens, the size
-in cache is updated from servers and will be in sync and no further writes will be allowed. A timeout
-of zero will force fetching of directory sizes from server for every operation that modifies file data
-and will effectively disables directory size caching on client side.
-</para>
- <para><emphasis role="bold">To update the memory cache size</emphasis>
-</para>
- <itemizedlist>
- <listitem>
- <para>Update the memory cache size using the following command:
-</para>
- <para><command># gluster volume set <replaceable>VOLNAME</replaceable> features.quota-timeout<replaceable> value</replaceable></command></para>
- <para>For example, to update the memory cache size for every 5 seconds on test-volume:
-</para>
- <programlisting># gluster volume set test-volume features.quota-timeout 5
-Set volume successful</programlisting>
- </listitem>
- </itemizedlist>
- </section>
- <section id="chap-Administration_Guide-Dir_Quota-Remove">
- <title>Removing Disk Limit </title>
- <para>You can remove set disk limit, if you do not want quota anymore.
-</para>
- <para><emphasis role="bold">To remove disk limit </emphasis></para>
- <itemizedlist>
- <listitem>
- <para>Remove disk limit set on a particular directory using the following command:
-</para>
- <para><command># gluster volume quota <replaceable>VOLNAME</replaceable> remove <replaceable>/directory name</replaceable></command>
-</para>
- <para>For example, to remove the disk limit on /data directory of test-volume:
-</para>
- <programlisting># gluster volume quota test-volume remove /data
-Usage limit set on /data is removed</programlisting>
- </listitem>
- </itemizedlist>
- </section>
-</chapter>