e226328295
Remove all ENTITY declarations that are not used in a file. Change-Id: I9b53b53754b303b5b001a95b44e57493bb90b222
59 lines
2.9 KiB
XML
59 lines
2.9 KiB
XML
<section xml:id="ceph-backup-driver"
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xmlns="http://docbook.org/ns/docbook"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0">
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<title>Ceph backup driver</title>
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<para>The Ceph backup driver backs up volumes of any type to a
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Ceph back-end store. The driver can also detect
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whether the volume to be backed up is a Ceph RBD
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volume, and if so, it tries to perform incremental and
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differential backups.</para>
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<para>For source Ceph RBD volumes, you can perform backups
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within the same Ceph pool (not recommended) and
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backups between different Ceph pools and between
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different Ceph clusters.</para>
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<para>At the time of writing, differential backup support in
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Ceph/librbd was quite new. This driver attempts a
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differential backup in the first instance. If the
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differential backup fails, the driver falls back to
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full backup/copy.</para>
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<para>If incremental backups are used, multiple backups of the
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same volume are stored as snapshots so that minimal
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space is consumed in the backup store. It takes far
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less time to restore a volume than to take a full
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copy.</para>
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<note>
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<para>Block Storage enables you to:</para>
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<itemizedlist>
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<listitem>
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<para>Restore to a new volume, which
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is the default and recommended
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action.</para>
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</listitem>
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<listitem>
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<para>Restore to the original volume
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from which the backup was taken.
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The restore action takes a full
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copy because this is the safest
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action.</para>
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</listitem>
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</itemizedlist>
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</note>
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<para>To enable the Ceph backup driver, include the following
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option in the <filename>cinder.conf</filename>
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file:</para>
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<programlisting>backup_driver = cinder.backup.drivers.ceph</programlisting>
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<para>The following configuration options are available for
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the Ceph backup driver.</para>
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<xi:include
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href="../../../common/tables/cinder-backups_ceph.xml"/>
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<para>This example shows the default options for the Ceph
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backup driver.</para>
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<programlisting>backup_ceph_conf=/etc/ceph/ceph.conf
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backup_ceph_user = cinder
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backup_ceph_chunk_size = 134217728
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backup_ceph_pool = backups
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backup_ceph_stripe_unit = 0
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backup_ceph_stripe_count = 0</programlisting>
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</section>
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