Remove LVM "shred" volume_clear option
The shred option was deprecated in Newton and has been removed. This updates the volume wiping instructions to reflect that change and corrects a few of the referenced URLs. Change-Id: I251a07525bec5f099220d41fafb1fce3d738e3cb
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@ -4,10 +4,11 @@ Volume Wiping
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There are several ways to wipe a block storage device. The traditional way is
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to set the ``lvm_type`` to ``thin``, and then use the ``volume_clear``
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parameter. Alternatively, if the volume encryption feature is used, then
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volume wiping is not necessary if the volume encryption key is deleted.
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See the OpenStack Configuration Reference doc in the `Volume Encryption
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<https://docs.openstack.org/ocata/config-reference/block-storage/volume-encryption.html>`__
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parameter if using the LVM backend. Alternatively, if the volume encryption
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feature is used, then volume wiping is not necessary if the volume encryption
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key is deleted. See the OpenStack Configuration Reference doc in the
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`Volume Encryption
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<https://docs.openstack.org/cinder/latest/configuration/block-storage/volume-encryption.html>`__
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section for set up details and also the `Castellan usage
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<https://docs.openstack.org/castellan/latest/user/index.html>`__ document
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for key deletion.
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@ -18,21 +19,17 @@ for key deletion.
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wipe. While this method still works, ``lvm_type=default`` is not
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recommended for setting secure delete.
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The ``volume_clear`` parameter can accept either ``zero`` or ``shred``
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arguments. The ``zero`` argument will write a single pass of zeroes to the
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device. The ``shred`` argument will write three passes of predetermined bit
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patterns.
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The ``volume_clear`` parameter can be set to ``zero``. The ``zero`` argument
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will write a single pass of zeroes to the device.
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For more information about the ``lvm_type`` parameter, see
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the `LVM Block Storage section
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<https://docs.openstack.org/ocata/config-reference/block-storage/drivers/lvm-volume-driver.html>`__
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For more information about the ``lvm_type`` parameter, see sections
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`LVM
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<https://docs.openstack.org/cinder/latest/configuration/block-storage/drivers/lvm-volume-driver.html>`__
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and `Oversubscription in thin provisioning
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<https://docs.openstack.org/cinder/latest/admin/blockstorage-over-subscription.html>`__
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of the *cinder* project documentation.
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of OpenStack Configuration Reference and
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the `Oversubscription in thin provisioning
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<https://docs.openstack.org/admin-guide/blockstorage_over_subscription.html>`__
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of OpenStack Administrator Guide.
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For more information about the ``volume_clear`` parameter, see the
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`Block Storage sample configuration files
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<https://docs.openstack.org/ocata/config-reference/block-storage/samples/index.html>`__
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of OpenStack Configuration Reference.
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For more information about the ``volume_clear`` parameter, see section
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`Cinder Configuration Options
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<https://docs.openstack.org/cinder/latest/sample_config.html>`__
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of the *cinder* project documentation.
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