Things settled a tiny bit after unmount (see last email for the errors that generated) and remount, and a balance -mconvert,soft worked: [268093.588482] BTRFS info (device dm-2): balance: start -mconvert=raid1,soft -sconvert=raid1,soft ... [288405.946776] BTRFS info (device dm-2): balance: ended with status: 0 However, the enospc issue still appears and seems tied to a few of the previously-allocated metadata blocks: # btrfs balance start -musage=0 /bigraid ... [289714.420418] BTRFS info (device dm-2): balance: start -musage=0 -susage=0 [289714.508411] BTRFS info (device dm-2): 64 enospc errors during balance [289714.508413] BTRFS info (device dm-2): balance: ended with status: -28 # cd /sys/fs/btrfs/e2843f83-aadf-418d-b36b-5642f906808f/allocation/ && grep -Tr . metadata/raid1/used_bytes: 255838797824 metadata/raid1/total_bytes: 441307889664 metadata/disk_used: 511677595648 metadata/bytes_pinned: 0 metadata/bytes_used: 255838797824 metadata/total_bytes_pinned: 999424 metadata/disk_total: 882615779328 metadata/total_bytes: 441307889664 metadata/bytes_reserved: 4227072 metadata/bytes_readonly: 65536 metadata/bytes_may_use: 433502945280 metadata/flags: 4 system/raid1/used_bytes: 1474560 system/raid1/total_bytes: 33554432 system/disk_used: 2949120 system/bytes_pinned: 0 system/bytes_used: 1474560 system/total_bytes_pinned: 0 system/disk_total: 67108864 system/total_bytes: 33554432 system/bytes_reserved: 0 system/bytes_readonly: 0 system/bytes_may_use: 0 system/flags: 2 global_rsv_reserved: 536870912 data/disk_used: 13645423230976 data/bytes_pinned: 0 data/bytes_used: 13645423230976 data/single/used_bytes: 13645423230976 data/single/total_bytes: 13661217226752 data/total_bytes_pinned: 0 data/disk_total: 13661217226752 data/total_bytes: 13661217226752 data/bytes_reserved: 117518336 data/bytes_readonly: 196608 data/bytes_may_use: 15064711168 data/flags: 1 global_rsv_size: 536870912 Somewhat more frightening, this also happens on the system blocks: [288405.946776] BTRFS info (device dm-2): balance: ended with status: 0 [289589.506357] BTRFS info (device dm-2): balance: start -musage=5 -susage=5 [289589.905675] BTRFS info (device dm-2): relocating block group 9676759498752 flags system|raid1 [289590.807033] BTRFS info (device dm-2): found 89 extents [289591.300212] BTRFS info (device dm-2): 16 enospc errors during balance [289591.300216] BTRFS info (device dm-2): balance: ended with status: -28 Matt On 2/3/20 9:40 PM, Chris Murphy wrote: > A developer might find it useful to see this reproduced with mount > option enospc_debug. And soon after enospc the output from: > > cd /sys/fs/btrfs/UUID/allocation/ && grep -Tr . > > yep, space then dot at the end >
