btrfs device usage
/dev/sdb1, ID: 1
Device size: 2.73TiB
Device slack: 0.00B
Data,RAID1: 2.01TiB
Metadata,RAID1: 4.00GiB
Unallocated: 734.49GiB
/dev/sdc1, ID: 2
Device size: 2.73TiB
Device slack: 0.00B
Data,RAID1: 2.01TiB
Metadata,RAID1: 3.00GiB
System,RAID1: 64.00MiB
Unallocated: 734.46GiB
/dev/sdd1, ID: 3
Device size: 2.73TiB
Device slack: 3.00KiB
Data,RAID1: 1.95TiB
Metadata,RAID1: 5.00GiB
System,RAID1: 64.00MiB
Unallocated: 790.46GiB
btrfs filesystem usage
Overall:
Device size: 8.19TiB
Device allocated: 5.98TiB
Device unallocated: 2.21TiB
Device missing: 0.00B
Used: 5.96TiB
Free (estimated): 1.11TiB (min: 1.11TiB)
Data ratio: 2.00
Metadata ratio: 2.00
Global reserve: 512.00MiB (used: 0.00B)
Data,RAID1: Size:2.98TiB, Used:2.98TiB
/dev/sdb1 2.01TiB
/dev/sdc1 2.01TiB
/dev/sdd1 1.95TiB
Metadata,RAID1: Size:6.00GiB, Used:4.85GiB
/dev/sdb1 4.00GiB
/dev/sdc1 3.00GiB
/dev/sdd1 5.00GiB
System,RAID1: Size:64.00MiB, Used:480.00KiB
/dev/sdc1 64.00MiB
/dev/sdd1 64.00MiB
Unallocated:
/dev/sdb1 734.49GiB
/dev/sdc1 734.46GiB
/dev/sdd1 790.46GiB
btrfs scrub status
scrub status for 493787da-b488-4661-b95c-2a132109efa6
scrub started at Wed Feb 20 03:17:41 2019 and finished after 09:59:51
total bytes scrubbed: 5.96TiB with 2 errors
error details: read=2
corrected errors: 2, uncorrectable errors: 0, unverified errors: 0
btrfs device stats
[/dev/sdb1].write_io_errs 4989503
[/dev/sdb1].read_io_errs 2401487
[/dev/sdb1].flush_io_errs 134408
[/dev/sdb1].corruption_errs 4280
[/dev/sdb1].generation_errs 55
[/dev/sdc1].write_io_errs 0
[/dev/sdc1].read_io_errs 0
[/dev/sdc1].flush_io_errs 0
[/dev/sdc1].corruption_errs 0
[/dev/sdc1].generation_errs 0
[/dev/sdd1].write_io_errs 0
[/dev/sdd1].read_io_errs 0
[/dev/sdd1].flush_io_errs 0
[/dev/sdd1].corruption_errs 0
[/dev/sdd1].generation_errs 0