The software described in this documentation is either in Extended Support or Sustaining Support. See https://www.oracle.com/us/support/library/enterprise-linux-support-policies-069172.pdf for more information.
Oracle recommends that you upgrade the software described by this documentation as soon as possible.
The following table shows how you can use the btrfs command to add or remove devices, and to rebalance the layout of the file system data and metadata across the devices.
Command | Description |
|---|---|
btrfs device add
| Add a device to the file system that is mounted on the specified mount point. For example: btrfs device add /dev/sdd /myfs |
btrfs device delete
| Remove a device from a mounted file system. For example: btrfs device delete /dev/sde /myfs |
btrfs device delete missing
| Remove a failed device from the file system that is mounted in degraded mode. For example: btrfs device remove missing /myfs To mount a file system in degraded mode, specify the -o degraded option to the mount command. For a RAID configuration, if the number of devices would fall below the minimum number that are required, you must add the replacement device before removing the failed device. |
btrfs filesystem balance
| After adding or removing devices, redistribute the file system data and metadata across the available devices. |