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 device replacement feature requires that you boot the system using UEK R3.
You can replace devices on a live file system. You do not need to unmount the file system or stop any tasks that are using it. If the system crashes or loses power while the replacement is taking place, the operation resumes when the system next mounts the file system.
Use the following command to replace a device on a mounted btrfs file system:
#btrfs replace startsource_devtarget_dev[-r]mountpoint
source_dev and
target_dev specify the device to be
replaced (source device) and the replacement
device (target device).
mountpoint specifies the file system
that is using the source device. The target device must be the
same size as or larger than the source device. If the source
device is no longer available or you specify the
-r option, the data is reconstructed by using
redundant data obtained from other devices (such as another
available mirror). The source device is removed from the file
system when the operation is complete.
You can use the btrfs replace status
mountpoint and btrfs replace
cancel mountpoint commands to
check the progress of the replacement operation or to cancel the
operation.