Removing a CephFS

Learn how to remove a Ceph File System.

Before you begin

Before removing a CephFS, be sure that you have root-level access to a Ceph Monitor node and to back up your data.

About this task

You can remove a Ceph File System (CephFS). Before doing so, consider backing up all the data and verifying that all clients have unmounted the file system locally.

Warning: This operation is destructive and will make the data that is stored on the Ceph File System permanently inaccessible.

Procedure

Mark the storage cluster as down:
```
ceph fs set FS_NAME down true
```
Replace FS_NAME with the name of the Ceph File System that you want to remove.
For example:
```
[ceph: root@host01 /]# ceph fs set cephfs down true

cephfs marked down.
```

Display the status of the Ceph File System.

ceph fs status

For example:

[ceph: root@host01 /]# ceph fs status

cephfs - 0 clients
======
+-------------------+----------+-------+-------+
|       POOL        |   TYPE   |  USED | AVAIL |
+-----------------+------------+-------+-------+
|cephfs.cephfs.meta | metadata | 31.5M |  52.6G|
|cephfs.cephfs.data |   data   |    0  |  52.6G|
+-----------------+----------+-------+---------+
               STANDBY MDS
cephfs.ceph-host01
cephfs.ceph-host02
cephfs.ceph-host03

Remove the Ceph File System.
```
ceph fs rm FS_NAME --yes-i-really-mean-it
```
Replace FS_NAME with the name of the Ceph File System that you want to remove.
For example:
```
[ceph: root@host01 /]# ceph fs rm cephfs --yes-i-really-mean-it
```
Verify that the file system has been successfully removed.
For example:
```
[ceph: root@host01 /]# ceph fs ls
```
Optional: Remove data and metadata pools associated with the removed file system.