btrfs filesystem resize <ID>:max not working

["André-Sebastian Liebe" <andre@lianse.eu>]

Hey list,

I've got a problem with resizing a multi drive filesystem.
I had a 5 disk array of 4TB drives. Then I added a 5th (6TB) drive to
the array and replaced one of the 4TB ones with a 6TB drive. As you can
see in my `btrfs fi sh` output below, my newly added drive (ID=6) has
the expected size of 5.46TiB, but my replaced drive (ID=4) won't show up
as 6TB as expected. Neither a `btrfs fi res max /data/pool0` nor a
`btrfs fi res 4:max /data/pool0` had any effect.

Any suggestions how to reclaim the 2TB free space of drive 4?


Thanks in advance

André-Sebastian Liebe


> Kernel:Linux apc01 3.19.2-1-ARCH #1 SMP PREEMPT Wed Mar 18 16:21:02
CET 2015 x86_64 GNU/Linux
> btrfs-progs: btrfs-progs v3.19

My 6 drives used by the apc01_pool (none of them has a partition table)
Konsole output
> # hdparm -I /dev/sdb | grep "device size"           
>        device size with M = 1024*1024:     3815447 MBytes
>        device size with M = 1000*1000:     4000787 MBytes (4000 GB)
> # hdparm -I /dev/sdc | grep "device size"  
>        device size with M = 1024*1024:     3815447 MBytes
>        device size with M = 1000*1000:     4000787 MBytes (4000 GB)
> # hdparm -I /dev/sdd | grep "device size"  
>        device size with M = 1024*1024:     3815447 MBytes
>        device size with M = 1000*1000:     4000787 MBytes (4000 GB)
> # hdparm -I /dev/sde | grep "device size"  
>        device size with M = 1024*1024:     3815447 MBytes
>        device size with M = 1000*1000:     4000787 MBytes (4000 GB)
> # hdparm -I /dev/sdf | grep "device size"  
>        device size with M = 1024*1024:     5723166 MBytes
>        device size with M = 1000*1000:     6001175 MBytes (6001 GB)
> # hdparm -I /dev/sdg | grep "device size"  
>        device size with M = 1024*1024:     5723166 MBytes
>        device size with M = 1000*1000:     6001175 MBytes (6001 GB)


btrfs filesystem:
Konsole output
> # btrfs fi sh
> Label: 'apc01_pool0'  uuid: 066141c6-16ca-4a30-b55c-e606b90ad0fb
>        Total devices 6 FS bytes used 23.43TiB
>        devid    1 size 3.64TiB used 3.61TiB path /dev/sdd
>        devid    2 size 3.64TiB used 3.61TiB path /dev/sdc
>        devid    3 size 3.64TiB used 3.61TiB path /dev/sde
>        devid    4 size 3.64TiB used 3.61TiB path /dev/sdg
>        devid    5 size 3.64TiB used 3.61TiB path /dev/sdb
>        devid    6 size 5.46TiB used 5.43TiB path /dev/sdf