It seems on a standard nova/ceph deployment an unrescue command doesn't clean up the .rescue RBD disk created for the rescue environment.
$ rbd ls compute | grep e9f2e3f4-f095-45b4-b5f2-1b34d3776191 e9f2e3f4-f095-45b4-b5f2-1b34d3776191_disk $ nova rescue e9f2e3f4-f095-45b4-b5f2-1b34d3776191 +-----------+--------------+ | Property | Value | +-----------+--------------+ | adminPass | hXXDHUqNRn7u | +-----------+--------------+ $ rbd ls compute | grep e9f2e3f4-f095-45b4-b5f2-1b34d3776191 e9f2e3f4-f095-45b4-b5f2-1b34d3776191_disk e9f2e3f4-f095-45b4-b5f2-1b34d3776191_disk.rescue $ nova unrescue e9f2e3f4-f095-45b4-b5f2-1b34d3776191 $ rbd ls compute | grep e9f2e3f4-f095-45b4-b5f2-1b34d3776191 e9f2e3f4-f095-45b4-b5f2-1b34d3776191_disk e9f2e3f4-f095-45b4-b5f2-1b34d3776191_disk.rescue
This was tested on 2015.1.1-1.el7
It seems on a standard nova/ceph deployment an unrescue command doesn't clean up the .rescue RBD disk created for the rescue environment.
$ rbd ls compute | grep e9f2e3f4- f095-45b4- b5f2-1b34d37761 91 f095-45b4- b5f2-1b34d37761 91_disk f095-45b4- b5f2-1b34d37761 91 -----+- ------- ------+ -----+- ------- ------+ -----+- ------- ------+ f095-45b4- b5f2-1b34d37761 91 f095-45b4- b5f2-1b34d37761 91_disk f095-45b4- b5f2-1b34d37761 91_disk. rescue f095-45b4- b5f2-1b34d37761 91 f095-45b4- b5f2-1b34d37761 91 f095-45b4- b5f2-1b34d37761 91_disk f095-45b4- b5f2-1b34d37761 91_disk. rescue
e9f2e3f4-
$ nova rescue e9f2e3f4-
+------
| Property | Value |
+------
| adminPass | hXXDHUqNRn7u |
+------
$ rbd ls compute | grep e9f2e3f4-
e9f2e3f4-
e9f2e3f4-
$ nova unrescue e9f2e3f4-
$ rbd ls compute | grep e9f2e3f4-
e9f2e3f4-
e9f2e3f4-
This was tested on 2015.1.1-1.el7