заменить устройства, управляемые btrfs, на другое устройство (replace devices managed by btrfs with other device.)
Имя (Name)
btrfs-replace - replace devices managed by btrfs with other
device.
Синопсис (Synopsis)
btrfs replace <subcommand> <args>
Описание (Description)
btrfs replace is used to replace btrfs managed devices with other
device.
Подкоманда (Subcommand)
cancel <mount_point>
Cancel a running device replace operation.
start [options] <srcdev>|<devid> <targetdev> <path>
Replace device of a btrfs filesystem.
On a live filesystem, duplicate the data to the target device
which is currently stored on the source device. If the source
device is not available anymore, or if the -r option is set,
the data is built only using the RAID redundancy mechanisms.
After completion of the operation, the source device is
removed from the filesystem. If the <srcdev> is a numerical
value, it is assumed to be the device id of the filesystem
which is mounted at <path>, otherwise it is the path to the
source device. If the source device is disconnected, from the
system, you have to use the devid parameter format. The
<targetdev> needs to be same size or larger than the
<srcdev>.
Note
the filesystem has to be resized to fully take advantage
of a larger target device; this can be achieved with
btrfs filesystem resize <devid>:max /path
Options
-r
only read from <srcdev> if no other zero-defect mirror
exists. (enable this if your drive has lots of read
errors, the access would be very slow)
-f
force using and overwriting <targetdev> even if it looks
like it contains a valid btrfs filesystem.
A valid filesystem is assumed if a btrfs superblock is
found which contains a correct checksum. Devices that are
currently mounted are never allowed to be used as the
<targetdev>.
-B
no background replace.
--enqueue
wait if there's another exclusive operation running,
otherwise continue
status [-1] <mount_point>
Print status and progress information of a running device
replace operation.
Options
-1
print once instead of print continuously until the
replace operation finishes (or is cancelled)
Примеры (Examples)
Example 1. Replacing an online drive with a bigger one
Given the following filesystem mounted at /mnt/my-vault
Label: 'MyVault' uuid: ae20903e-b72d-49ba-b944-901fc6d888a1
Total devices 2 FS bytes used 1TiB
devid 1 size 1TiB used 500.00GiB path /dev/sda
devid 2 size 1TiB used 500.00GiB path /dev/sdb
In order to replace /dev/sda (devid 1) with a bigger drive
located at /dev/sdc you would run the following:
btrfs replace start 1 /dev/sdc /mnt/my-vault/
You can monitor progress via:
btrfs replace status /mnt/my-vault/
After the replacement is complete, as per the docs at
btrfs-filesystem(8) in order to use the entire storage space of
the new drive you need to run:
btrfs filesystem resize 1:max /mnt/my-vault/
Статус выхода (Exit)
btrfs replace returns a zero exit status if it succeeds. Non zero
is returned in case of failure.
Доступность (Availability)
btrfs is part of btrfs-progs. Please refer to the btrfs wiki
http://btrfs.wiki.kernel.org
Смотри также (See also)
mkfs.btrfs(8), btrfs-device(8), btrfs-filesystem(8),
