Just following up - the replace operation completed successfully and then the
source device (/dev/sdb) was removed, with all chunks moved on the target
(/dev/sdj). Putting it down to RAID level complexities I guess.
[root@array ~]# btrfs replace status -1 /export/archive/
Started on 15.Oct 19:15:11, finished on 17.Oct 21:23:10, 0 write errs, 0
uncorr. read errs
[root@array ~]# btrfs fi sh /export/archive/
Label: 'archive' uuid: 1b1f6bbb-0865-4752-bdaf-07ba30acb27e
Total devices 8 FS bytes used 20.65TiB
devid 1 size 5.46TiB used 5.46TiB path /dev/sdc
devid 2 size 5.46TiB used 5.46TiB path /dev/sdi
devid 3 size 5.46TiB used 5.46TiB path /dev/sdg
devid 4 size 5.46TiB used 5.46TiB path /dev/sdf
devid 5 size 4.55TiB used 4.55TiB path /dev/sdh
devid 6 size 4.55TiB used 4.55TiB path /dev/sdj
devid 7 size 5.46TiB used 5.46TiB path /dev/sde
devid 8 size 5.46TiB used 5.46TiB path /dev/sdd
btrfs-progs v4.2.1
[root@array ~]# btrfs fi usage /export/archive/
Overall:
Device size: 41.84TiB
Device allocated: 41.84TiB
Device unallocated: 12.19MiB
Device missing: 0.00B
Used: 41.30TiB
Free (estimated): 276.69GiB (min: 276.69GiB)
Data ratio: 2.00
Metadata ratio: 2.00
Global reserve: 512.00MiB (used: 0.00B)
Data,RAID1: Size:20.90TiB, Used:20.63TiB
/dev/sdc 5.45TiB
/dev/sdd 5.46TiB
/dev/sde 5.46TiB
/dev/sdf 5.45TiB
/dev/sdg 5.45TiB
/dev/sdh 4.55TiB
/dev/sdi 5.45TiB
/dev/sdj 4.55TiB
Metadata,single: Size:8.00MiB, Used:0.00B
/dev/sdc 8.00MiB
Metadata,RAID1: Size:23.00GiB, Used:22.16GiB
/dev/sdc 10.00GiB
/dev/sdd 1.00GiB
/dev/sdf 11.00GiB
/dev/sdg 11.00GiB
/dev/sdh 1.00GiB
/dev/sdi 11.00GiB
/dev/sdj 1.00GiB
System,single: Size:4.00MiB, Used:0.00B
/dev/sdc 4.00MiB
System,RAID1: Size:8.00MiB, Used:2.91MiB
/dev/sdf 8.00MiB
/dev/sdg 8.00MiB
Unallocated:
/dev/sdc 5.02MiB
/dev/sdd 1.02MiB
/dev/sde 1.02MiB
/dev/sdf 1.02MiB
/dev/sdg 1.02MiB
/dev/sdh 1.02MiB
/dev/sdi 1.02MiB
/dev/sdj 1.02MiB
[root@array ~]# btrfs fi resize 6:max /export/archive/
Resize '/export/archive/' of '6:max'
[root@array ~]# btrfs fi usage /export/archive/
Overall:
Device size: 44.57TiB
Device allocated: 41.84TiB
Device unallocated: 2.73TiB
Device missing: 0.00B
Used: 41.30TiB
Free (estimated): 1.63TiB (min: 1.63TiB)
Data ratio: 2.00
Metadata ratio: 2.00
Global reserve: 512.00MiB (used: 0.00B)
Data,RAID1: Size:20.90TiB, Used:20.63TiB
/dev/sdc 5.45TiB
/dev/sdd 5.46TiB
/dev/sde 5.46TiB
/dev/sdf 5.45TiB
/dev/sdg 5.45TiB
/dev/sdh 4.55TiB
/dev/sdi 5.45TiB
/dev/sdj 4.55TiB
Metadata,single: Size:8.00MiB, Used:0.00B
/dev/sdc 8.00MiB
Metadata,RAID1: Size:23.00GiB, Used:22.16GiB
/dev/sdc 10.00GiB
/dev/sdd 1.00GiB
/dev/sdf 11.00GiB
/dev/sdg 11.00GiB
/dev/sdh 1.00GiB
/dev/sdi 11.00GiB
/dev/sdj 1.00GiB
System,single: Size:4.00MiB, Used:0.00B
/dev/sdc 4.00MiB
System,RAID1: Size:8.00MiB, Used:2.91MiB
/dev/sdf 8.00MiB
/dev/sdg 8.00MiB
Unallocated:
/dev/sdc 24.00KiB
/dev/sdd 1.02MiB
/dev/sde 1.02MiB
/dev/sdf 1.02MiB
/dev/sdg 1.02MiB
/dev/sdh 1.02MiB
/dev/sdi 1.02MiB
/dev/sdj 2.73TiB
[root@array ~]# btrfs fi sh /export/archive/
Label: 'archive' uuid: 1b1f6bbb-0865-4752-bdaf-07ba30acb27e
Total devices 8 FS bytes used 20.65TiB
devid 1 size 5.46TiB used 5.46TiB path /dev/sdc
devid 2 size 5.46TiB used 5.46TiB path /dev/sdi
devid 3 size 5.46TiB used 5.46TiB path /dev/sdg
devid 4 size 5.46TiB used 5.46TiB path /dev/sdf
devid 5 size 4.55TiB used 4.55TiB path /dev/sdh
devid 6 size 7.28TiB used 4.55TiB path /dev/sdj
devid 7 size 5.46TiB used 5.46TiB path /dev/sde
devid 8 size 5.46TiB used 5.46TiB path /dev/sdd
btrfs-progs v4.2.1
[root@array ~]#
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