On 2016/03/10 6:46, Hendrik Friedel wrote:
Hello,
I intend to move this subvolume to a new device.
btrfs fi show /mnt2/Data_Store/
Label: 'Data_Store' uuid: 0ccc1e24-090d-42e2-9e61-d0a1b3101f93
Total devices 1 FS bytes used 47.93GiB
devid 1 size 102.94GiB used 76.03GiB path /dev/sdb4
(fi usage at the bottom of this message)
The new device (sda4) is 8G smaller unfortunately.
sda 8:0 0 111.8G 0 disk
└─sda4 8:4 0 103.5G 0 part
sdb 8:16 0 119.2G 0 disk
└─sdb4 8:20 0 111G 0 part /mnt2/Data_Store
Thus, btrfs replace does not work
What would you suggest now to move the FS (it does contain many subvolumes)?
I tried btrfs send /mnt2/Data_Store/read_only_snapshot/ | btrfs receive
/mnt/sda4/
but this only created an empty subvolume /mnt/sda4/read_only_snapshot/
I suspect that you captured snapshot as
==========================
btrfs sub snap -r /mnt2/Data_Store /mnt2/Data_Store/read_only_snapshot
==========================
and /mnt2/Data_Store only contains subvolumes
instead of having files/directries directly.
Then send/receive work as you said. Probably if you run
"ls -li /mnt2/Data_Store", all files have
inode 256 (it means subvolume). In addition,
all the directories under
/mnt2/Data_Store/read_only_snapshot are empty.
It's because "sub snap" only handles one subvolume
and doesn't handle subvolumes inside it. So, if you'd
like to copy all the data by send/receive, you should
capture and send/receive snapshot for each subvolume.
So, then
btrfs device add /dev/sda4 /mnt/Data_Store
btrfs balance start /mnt/Data_Store
btrfs device remove /dev/sdb4 /mnt/Data_Store
?
balance is not necessary. When you run
device remove /dev/sdb4, then all the contents of
/dev/sdb4 migrate to /dev/sda4 properly.
Thanks,
Satoru
Or is there a better option?
Regards,
Hendrik
btrfs fi usage /mnt2/Data_Store/
Overall:
Device size: 102.94GiB
Device allocated: 74.03GiB
Device unallocated: 28.91GiB
Device missing: 0.00B
Used: 47.96GiB
Free (estimated): 53.24GiB (min: 53.24GiB)
Data ratio: 1.00
Metadata ratio: 1.00
Global reserve: 512.00MiB (used: 0.00B)
Data,single: Size:69.00GiB, Used:44.67GiB
/dev/sdb4 69.00GiB
Metadata,single: Size:5.00GiB, Used:3.29GiB
/dev/sdb4 5.00GiB
System,single: Size:32.00MiB, Used:16.00KiB
/dev/sdb4 32.00MiB
Unallocated:
/dev/sdb4 28.91GiB
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