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I have a raid10 setup with btrfs with 5 disk currently:

Total devices 5 FS bytes used 6.89TiB
devid    1 size 3.64TiB used 2.83TiB path /dev/sde
devid    2 size 3.64TiB used 2.83TiB path /dev/sdd
devid    3 size 3.64TiB used 2.83TiB path /dev/sdc
devid    4 size 3.64TiB used 2.83TiB path /dev/sdf
devid    5 size 3.64TiB used 2.47TiB path /dev/sdh

When I try to add a 6th disk with 

btrfs device add -f /dev/sdb /backup

Nothing happens after I got the message:

Performing full device TRIM (3.64TiB) ...

Any idea why is that?

Andrew Schulman
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Tesla43
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1 Answers1

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After the "btrfs device add", you will have 6 devices. Henceforth, new data will be spread over 6 disks in the RAID10 fashion.

Pre-existing data will continue to be distributed over 5 disks.

If you want pre-existing data to be re-distributed over 6 disks, do a "btrfs balance".

ivan98
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