Volume Wiping¶

There are several ways to wipe a block storage device. The traditional way is to set the lvm_type to thin, and then use the volume_clear parameter. Alternatively, if the volume encryption feature is used, then volume wiping is not necessary if the volume encryption key is deleted. See the OpenStack Configuration Reference doc in the Volume Encryption section for set up details and also the Castellan usage document for key deletion.

The volume_clear parameter can accept either zero or shred arguments. The zero argument will write a single pass of zeroes to the device. The shred argument will write three passes of predetermined bit patterns.

For more information about the lvm_type parameter, see the LVM Block Storage section

of OpenStack Configuration Reference and the Oversubscription in thin provisioning of OpenStack Administrator Guide.

For more information about the volume_clear parameter, see the Block Storage sample configuration files of OpenStack Configuration Reference.