When an LVM mirror suffers a device failure, a two-stage recovery takes place.
The first stage involves removing the failed devices. This can result in the
mirror being reduced to a linear device. The second stage — if configured to do so by the administrator — is to attempt to replace any of the failed devices. Note, however, that there is no guarantee that the second stage will choose devices previously in-use by the mirror that had not been part of the failure if others are available.