Designating a Storage Device as Read-only

If you want to designate a storage device associated with a volume as read-only, follow these steps:

Designating a storage device as read-only

Unmount the storage volume on the device that you want to designate as read-only:
```
ism_op -unmount device_path
```
To designate the storage device as read-only, use the command:
```
ism_config -volume name -only_restore yes
```
You can use this volume only for restores, not for backups.
To redesignate the storage device as writable, use the command:
```
ism_config -volume name -only_restore no
```
Remount the storage volume on the device.
You can now use this storage volume for backups.