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[109.252.90.29]) by smtp.gmail.com with ESMTPSA id y23-v6sm1081991ljk.95.2019.02.09.07.32.09 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 09 Feb 2019 07:32:09 -0800 (PST) Subject: Re: Cannot 'mount -o degraded /dev/replacement' after a replace To: =?UTF-8?Q?Jakob_Sch=c3=b6ttl?= , Qu Wenruo , linux-btrfs@vger.kernel.org References: <2efee604-e44c-b00b-2ea8-d13ebc8c6355@gmail.com> <5441dc9d-a552-e77e-f74d-fe6ef702d400@gmx.com> <57d3a28d-bf6e-7f89-3a2d-ebcb90fc6e32@gmail.com> From: Andrei Borzenkov Openpgp: preference=signencrypt Autocrypt: addr=arvidjaar@gmail.com; prefer-encrypt=mutual; keydata= xsDiBDxiRwwRBAC3CN9wdwpVEqUGmSoqF8tWVIT4P/bLCSZLkinSZ2drsblKpdG7x+guxwts +LgI8qjf/q5Lah1TwOqzDvjHYJ1wbBauxZ03nDzSLUhD4Ms1IsqlIwyTLumQs4vcQdvLxjFs G70aDglgUSBogtaIEsiYZXl4X0j3L9fVstuz4/wXtwCg1cN/yv/eBC0tkcM1nsJXQrC5Ay8D /1aA5qPticLBpmEBxqkf0EMHuzyrFlqVw1tUjZ+Ep2LMlem8malPvfdZKEZ71W1a/XbRn8FE SOp0tUa5GwdoDXgEp1CJUn+WLurR0KPDf01E4j/PHHAoABgrqcOTcIVoNpv2gNiBySVsNGzF XTeY/Yd6vQclkqjBYONGN3r9R8bWA/0Y1j4XK61qjowRk3Iy8sBggM3PmmNRUJYgroerpcAr 2byz6wTsb3U7OzUZ1Llgisk5Qum0RN77m3I37FXlIhCmSEY7KZVzGNW3blugLHcfw/HuCB7R 1w5qiLWKK6eCQHL+BZwiU8hX3dtTq9d7WhRW5nsVPEaPqudQfMSi/Ux1kc0mQW5kcmVpIEJv cnplbmtvdiA8YXJ2aWRqYWFyQGdtYWlsLmNvbT7CZQQTEQIAJQIbAwYLCQgHAwIGFQgCCQoL BBYCAwECHgECF4AFAliWAiQCGQEACgkQR6LMutpd94wFGwCeNuQnMDxve/Fo3EvYIkAOn+zE 21cAnRCQTXd1hTgcRHfpArEd/Rcb5+SczsBNBDxiRyQQBACQtME33UHfFOCApLki4kLFrIw1 5A5asua10jm5It+hxzI9jDR9/bNEKDTKSciHnM7aRUggLwTt+6CXkMy8an+tVqGL/MvDc4/R KKlZxj39xP7wVXdt8y1ciY4ZqqZf3tmmSN9DlLcZJIOT82DaJZuvr7UJ7rLzBFbAUh4yRKaN nwADBwQAjNvMr/KBcGsV/UvxZSm/mdpvUPtcw9qmbxCrqFQoB6TmoZ7F6wp/rL3TkQ5UElPR gsG12+Dk9GgRhnnxTHCFgN1qTiZNX4YIFpNrd0au3W/Xko79L0c4/49ten5OrFI/psx53fhY vLYfkJnc62h8hiNeM6kqYa/x0BEddu92ZG7CRgQYEQIABgUCPGJHJAAKCRBHosy62l33jMhd AJ48P7WDvKLQQ5MKnn2D/TI337uA/gCgn5mnvm4SBctbhaSBgckRmgSxfwQ= Message-ID: <0680cf0a-5a03-086f-d3f7-3317655401f0@gmail.com> Date: Sat, 9 Feb 2019 18:32:08 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <57d3a28d-bf6e-7f89-3a2d-ebcb90fc6e32@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org 09.02.2019 16:45, Jakob Schöttl пишет: > Thanks Qu, > > Am 09.02.19 um 13:16 schrieb Qu Wenruo: >> On 2019/2/9 下午6:36, Jakob Schöttl wrote: >>> Hi, >>> >>> I've setup a RAID1 with two disks (disk1 and disk2) and I'm testing the >>> btrfs replace command. >>> >>> After replacing disk2 with disk3, I can only mount >>> (a) disk1 or disk3 (if both disk are plugged) and >>> (b) the original disk1 (degraded, if disk3 is unplugged). >>> >>> I cannot mount the replacement disk3 if disk1 is unplugged. >> Sounds like there is one single chunk on disk1, which caused the problem. >> >>>> mount: /mnt: wrong fs type, bad option, bad superblock on /dev/loop3, >>> missing codepage or helper program, or other error. >> dmesg please. > [60456.856883] BTRFS: device label datavol devid 1 transid 5 /dev/loop1 > [60456.940785] BTRFS: device label datavol devid 2 transid 5 /dev/loop2 > [60525.211389] BTRFS info (device loop1): allowing degraded mounts > [60525.211395] BTRFS info (device loop1): disk space caching is enabled > [60525.211398] BTRFS info (device loop1): has skinny extents > [60525.211401] BTRFS info (device loop1): flagging fs with big metadata > feature > [60525.213854] BTRFS warning (device loop1): devid 2 uuid > 0b4e0b31-e2b1-40a0-8360-09978f58a2e4 is missing > [60525.214639] BTRFS info (device loop1): checking UUID tree > [60525.386695] BTRFS info (device loop1): dev_replace from disk> (devid 2) to /dev/loop3 started > [60525.394403] BTRFS info (device loop1): dev_replace from disk> (devid 2) to /dev/loop3 finished > [60533.721841] BTRFS info (device loop3): allowing degraded mounts > [60533.721846] BTRFS info (device loop3): disk space caching is enabled > [60533.721850] BTRFS info (device loop3): has skinny extents > [60533.723703] BTRFS error (device loop3): failed to read chunk root > [60533.773553] BTRFS error (device loop3): open_ctree failed > >> And btrfs-progs version please. > $ pacman -Q btrfs-progs > btrfs-progs 4.20.1-2 > $ uname -a > Linux jathink 4.20.7-arch1-1-ARCH #1 SMP PREEMPT Wed Feb 6 18:42:40 UTC > 2019 x86_64 GNU/Linux > >> Maybe mkfs is too old to leave SINGLE profile chunks on the original fs. >> >> And you could verify the chunk mapping by executing 'btrfs ins dump-tree >> -t chunk ' and paste the output. > > When only /dev/loop3 is plugged: > > # btrfs inspect-internal dump-tree -t chunk /dev/loop3 > btrfs-progs v4.20.1 > warning, device 1 is missing > warning, device 1 is missing > warning, device 1 is missing > warning, device 1 is missing > bad tree block 198180864, bytenr mismatch, want=198180864, have=0 > ERROR: cannot read chunk root > ERROR: unable to open /dev/loop3 > > When only /dev/loop1 is plugged: > > # btrfs inspect-internal dump-tree -t chunk /dev/loop1 > btrfs-progs v4.20.1 > warning, device 2 is missing > chunk tree > leaf 198180864 items 10 free space 15005 generation 8 owner CHUNK_TREE > leaf 198180864 flags 0x1(WRITTEN) backref revision 1 > fs uuid 005a8d59-a561-4371-869e-b0ccc4a4862b > chunk uuid b3e609f1-a7fe-4add-bc51-6231f0bbf320 >     item 0 key (DEV_ITEMS DEV_ITEM 1) itemoff 16185 itemsize 98 >         devid 1 total_bytes 307200000 bytes_used 306053120 >         io_align 4096 io_width 4096 sector_size 4096 type 0 >         generation 0 start_offset 0 dev_group 0 >         seek_speed 0 bandwidth 0 >         uuid 043443c7-ac91-4085-a5e4-983b59dd0803 >         fsid 005a8d59-a561-4371-869e-b0ccc4a4862b >     item 1 key (DEV_ITEMS DEV_ITEM 2) itemoff 16087 itemsize 98 >         devid 2 total_bytes 307200000 bytes_used 109051904 >         io_align 4096 io_width 4096 sector_size 4096 type 0 >         generation 0 start_offset 0 dev_group 0 >         seek_speed 0 bandwidth 0 >         uuid 0b4e0b31-e2b1-40a0-8360-09978f58a2e4 >         fsid 005a8d59-a561-4371-869e-b0ccc4a4862b >     item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 22020096) itemoff 15975 > itemsize 112 >         length 8388608 owner 2 stripe_len 65536 type SYSTEM|RAID1 >         io_align 65536 io_width 65536 sector_size 4096 >         num_stripes 2 sub_stripes 0 >             stripe 0 devid 2 offset 1048576 >             dev_uuid 0b4e0b31-e2b1-40a0-8360-09978f58a2e4 >             stripe 1 devid 1 offset 22020096 >             dev_uuid 043443c7-ac91-4085-a5e4-983b59dd0803 >     item 3 key (FIRST_CHUNK_TREE CHUNK_ITEM 30408704) itemoff 15863 > itemsize 112 >         length 33554432 owner 2 stripe_len 65536 type METADATA|RAID1 >         io_align 65536 io_width 65536 sector_size 4096 >         num_stripes 2 sub_stripes 0 >             stripe 0 devid 2 offset 9437184 >             dev_uuid 0b4e0b31-e2b1-40a0-8360-09978f58a2e4 >             stripe 1 devid 1 offset 30408704 >             dev_uuid 043443c7-ac91-4085-a5e4-983b59dd0803 >     item 4 key (FIRST_CHUNK_TREE CHUNK_ITEM 63963136) itemoff 15751 > itemsize 112 >         length 67108864 owner 2 stripe_len 65536 type DATA|RAID1 >         io_align 65536 io_width 65536 sector_size 4096 >         num_stripes 2 sub_stripes 0 >             stripe 0 devid 2 offset 42991616 >             dev_uuid 0b4e0b31-e2b1-40a0-8360-09978f58a2e4 >             stripe 1 devid 1 offset 63963136 >             dev_uuid 043443c7-ac91-4085-a5e4-983b59dd0803 >     item 5 key (FIRST_CHUNK_TREE CHUNK_ITEM 131072000) itemoff 15671 > itemsize 80 >         length 33554432 owner 2 stripe_len 65536 type METADATA >         io_align 65536 io_width 65536 sector_size 4096 >         num_stripes 1 sub_stripes 1 >             stripe 0 devid 1 offset 131072000 >             dev_uuid 043443c7-ac91-4085-a5e4-983b59dd0803 >     item 6 key (FIRST_CHUNK_TREE CHUNK_ITEM 164626432) itemoff 15591 > itemsize 80 >         length 33554432 owner 2 stripe_len 65536 type SYSTEM >         io_align 65536 io_width 65536 sector_size 4096 >         num_stripes 1 sub_stripes 1 >             stripe 0 devid 1 offset 164626432 >             dev_uuid 043443c7-ac91-4085-a5e4-983b59dd0803 >     item 7 key (FIRST_CHUNK_TREE CHUNK_ITEM 198180864) itemoff 15479 > itemsize 112 >         length 33554432 owner 2 stripe_len 65536 type SYSTEM|DUP >         io_align 65536 io_width 65536 sector_size 4096 >         num_stripes 2 sub_stripes 1 >             stripe 0 devid 1 offset 198180864 >             dev_uuid 043443c7-ac91-4085-a5e4-983b59dd0803 >             stripe 1 devid 1 offset 231735296 >             dev_uuid 043443c7-ac91-4085-a5e4-983b59dd0803 >     item 8 key (FIRST_CHUNK_TREE CHUNK_ITEM 231735296) itemoff 15367 > itemsize 112 >         length 20905984 owner 2 stripe_len 65536 type METADATA|DUP >         io_align 65536 io_width 65536 sector_size 4096 >         num_stripes 2 sub_stripes 1 >             stripe 0 devid 1 offset 265289728 >             dev_uuid 043443c7-ac91-4085-a5e4-983b59dd0803 >             stripe 1 devid 1 offset 286195712 >             dev_uuid 043443c7-ac91-4085-a5e4-983b59dd0803 >     item 9 key (FIRST_CHUNK_TREE CHUNK_ITEM 252641280) itemoff 15255 > itemsize 112 >         length 10485760 owner 2 stripe_len 65536 type DATA|DUP >         io_align 65536 io_width 65536 sector_size 4096 >         num_stripes 2 sub_stripes 1 >             stripe 0 devid 1 offset 1048576 >             dev_uuid 043443c7-ac91-4085-a5e4-983b59dd0803 >             stripe 1 devid 1 offset 11534336 >             dev_uuid 043443c7-ac91-4085-a5e4-983b59dd0803 > > Yes, I can trivially reproduce it using commands in original post. Immediately after mkfs: 10:/home/bor # btrfs inspect-internal dump-tree -t chunk /dev/sdb1 btrfs-progs v4.15 warning, device 2 is missing chunk tree leaf 22036480 items 5 free space 15626 generation 5 owner 3 leaf 22036480 flags 0x1(WRITTEN) backref revision 1 fs uuid d33e6bff-5903-449d-b49c-f2d992676e30 chunk uuid ed55b2ad-66c4-4764-acd5-7fa3a9fe619e item 0 key (DEV_ITEMS DEV_ITEM 1) itemoff 16185 itemsize 98 devid 1 total_bytes 5367640064 bytes_used 1081868288 io_align 4096 io_width 4096 sector_size 4096 type 0 generation 0 start_offset 0 dev_group 0 seek_speed 0 bandwidth 0 uuid 653ea52e-f95f-417b-af6f-feb82ca49cd6 fsid d33e6bff-5903-449d-b49c-f2d992676e30 item 1 key (DEV_ITEMS DEV_ITEM 2) itemoff 16087 itemsize 98 devid 2 total_bytes 5367640064 bytes_used 1081868288 io_align 4096 io_width 4096 sector_size 4096 type 0 generation 0 start_offset 0 dev_group 0 seek_speed 0 bandwidth 0 uuid 1e91c346-eba9-4a41-aeb2-d7efef64a5ea fsid d33e6bff-5903-449d-b49c-f2d992676e30 item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 22020096) itemoff 15975 itemsize 112 length 8388608 owner 2 stripe_len 65536 type SYSTEM|RAID1 io_align 65536 io_width 65536 sector_size 4096 num_stripes 2 sub_stripes 0 stripe 0 devid 2 offset 1048576 dev_uuid 1e91c346-eba9-4a41-aeb2-d7efef64a5ea stripe 1 devid 1 offset 22020096 dev_uuid 653ea52e-f95f-417b-af6f-feb82ca49cd6 item 3 key (FIRST_CHUNK_TREE CHUNK_ITEM 30408704) itemoff 15863 itemsize 112 length 536739840 owner 2 stripe_len 65536 type METADATA|RAID1 io_align 65536 io_width 65536 sector_size 4096 num_stripes 2 sub_stripes 0 stripe 0 devid 2 offset 9437184 dev_uuid 1e91c346-eba9-4a41-aeb2-d7efef64a5ea stripe 1 devid 1 offset 30408704 dev_uuid 653ea52e-f95f-417b-af6f-feb82ca49cd6 item 4 key (FIRST_CHUNK_TREE CHUNK_ITEM 567148544) itemoff 15751 itemsize 112 length 536739840 owner 2 stripe_len 65536 type DATA|RAID1 io_align 65536 io_width 65536 sector_size 4096 num_stripes 2 sub_stripes 0 stripe 0 devid 2 offset 546177024 dev_uuid 1e91c346-eba9-4a41-aeb2-d7efef64a5ea stripe 1 devid 1 offset 567148544 dev_uuid 653ea52e-f95f-417b-af6f-feb82ca49cd6 Immediately after degraded mount btrfs-progs v4.15 warning, device 2 is missing chunk tree leaf 22020096 items 8 free space 15311 generation 6 owner 3 leaf 22020096 flags 0x1(WRITTEN) backref revision 1 fs uuid e69b93ef-d852-4afa-8c74-50fa07d33a01 chunk uuid 74317bdd-f011-44a8-9c62-0cce665f1b52 item 0 key (DEV_ITEMS DEV_ITEM 1) itemoff 16185 itemsize 98 devid 1 total_bytes 5368709120 bytes_used 2994733056 io_align 4096 io_width 4096 sector_size 4096 type 0 generation 0 start_offset 0 dev_group 0 seek_speed 0 bandwidth 0 uuid 85365dff-ceb8-46bb-a4c5-78ce422a32f8 fsid e69b93ef-d852-4afa-8c74-50fa07d33a01 item 1 key (DEV_ITEMS DEV_ITEM 2) itemoff 16087 itemsize 98 devid 2 total_bytes 5368709120 bytes_used 2155872256 io_align 4096 io_width 4096 sector_size 4096 type 0 generation 0 start_offset 0 dev_group 0 seek_speed 0 bandwidth 0 uuid 1989d9cd-9f82-4d3a-a577-c7e583157ed3 fsid e69b93ef-d852-4afa-8c74-50fa07d33a01 item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 22020096) itemoff 15975 itemsize 112 length 8388608 owner 2 stripe_len 65536 type SYSTEM|RAID1 io_align 65536 io_width 65536 sector_size 4096 num_stripes 2 sub_stripes 0 stripe 0 devid 2 offset 1048576 dev_uuid 1989d9cd-9f82-4d3a-a577-c7e583157ed3 stripe 1 devid 1 offset 22020096 dev_uuid 85365dff-ceb8-46bb-a4c5-78ce422a32f8 item 3 key (FIRST_CHUNK_TREE CHUNK_ITEM 30408704) itemoff 15863 itemsize 112 length 1073741824 owner 2 stripe_len 65536 type METADATA|RAID1 io_align 65536 io_width 65536 sector_size 4096 num_stripes 2 sub_stripes 0 stripe 0 devid 2 offset 9437184 dev_uuid 1989d9cd-9f82-4d3a-a577-c7e583157ed3 stripe 1 devid 1 offset 30408704 dev_uuid 85365dff-ceb8-46bb-a4c5-78ce422a32f8 item 4 key (FIRST_CHUNK_TREE CHUNK_ITEM 1104150528) itemoff 15751 itemsize 112 length 1073741824 owner 2 stripe_len 65536 type DATA|RAID1 io_align 65536 io_width 65536 sector_size 4096 num_stripes 2 sub_stripes 0 stripe 0 devid 2 offset 1083179008 dev_uuid 1989d9cd-9f82-4d3a-a577-c7e583157ed3 stripe 1 devid 1 offset 1104150528 dev_uuid 85365dff-ceb8-46bb-a4c5-78ce422a32f8 item 5 key (FIRST_CHUNK_TREE CHUNK_ITEM 2177892352) itemoff 15671 itemsize 80 length 268435456 owner 2 stripe_len 65536 type METADATA io_align 65536 io_width 65536 sector_size 4096 num_stripes 1 sub_stripes 1 stripe 0 devid 1 offset 2177892352 dev_uuid 85365dff-ceb8-46bb-a4c5-78ce422a32f8 item 6 key (FIRST_CHUNK_TREE CHUNK_ITEM 2446327808) itemoff 15591 itemsize 80 length 33554432 owner 2 stripe_len 65536 type SYSTEM io_align 65536 io_width 65536 sector_size 4096 num_stripes 1 sub_stripes 1 stripe 0 devid 1 offset 2446327808 dev_uuid 85365dff-ceb8-46bb-a4c5-78ce422a32f8 item 7 key (FIRST_CHUNK_TREE CHUNK_ITEM 2479882240) itemoff 15511 itemsize 80 length 536870912 owner 2 stripe_len 65536 type DATA io_align 65536 io_width 65536 sector_size 4096 num_stripes 1 sub_stripes 1 stripe 0 devid 1 offset 2479882240 dev_uuid 85365dff-ceb8-46bb-a4c5-78ce422a32f8 After device replacement completed 10:/home/bor # btrfs replace status /mnt Started on 9.Feb 18:07:18, finished on 9.Feb 18:07:19, 0 write errs, 0 uncorr. read errs 10:/home/bor # btrfs inspect-internal dump-tree -t chunk /dev/sdb1 btrfs-progs v4.15 chunk tree leaf 1942749184 items 11 free space 14900 generation 9 owner 3 leaf 1942749184 flags 0x1(WRITTEN) backref revision 1 fs uuid d33e6bff-5903-449d-b49c-f2d992676e30 chunk uuid ed55b2ad-66c4-4764-acd5-7fa3a9fe619e item 0 key (DEV_ITEMS DEV_ITEM 1) itemoff 16185 itemsize 98 devid 1 total_bytes 5367640064 bytes_used 2793144320 io_align 4096 io_width 4096 sector_size 4096 type 0 generation 0 start_offset 0 dev_group 0 seek_speed 0 bandwidth 0 uuid 653ea52e-f95f-417b-af6f-feb82ca49cd6 fsid d33e6bff-5903-449d-b49c-f2d992676e30 item 1 key (DEV_ITEMS DEV_ITEM 2) itemoff 16087 itemsize 98 devid 2 total_bytes 5367640064 bytes_used 1081868288 io_align 4096 io_width 4096 sector_size 4096 type 0 generation 0 start_offset 0 dev_group 0 seek_speed 0 bandwidth 0 uuid 1e91c346-eba9-4a41-aeb2-d7efef64a5ea fsid d33e6bff-5903-449d-b49c-f2d992676e30 item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 22020096) itemoff 15975 itemsize 112 length 8388608 owner 2 stripe_len 65536 type SYSTEM|RAID1 io_align 65536 io_width 65536 sector_size 4096 num_stripes 2 sub_stripes 0 stripe 0 devid 2 offset 1048576 dev_uuid 1e91c346-eba9-4a41-aeb2-d7efef64a5ea stripe 1 devid 1 offset 22020096 dev_uuid 653ea52e-f95f-417b-af6f-feb82ca49cd6 item 3 key (FIRST_CHUNK_TREE CHUNK_ITEM 30408704) itemoff 15863 itemsize 112 length 536739840 owner 2 stripe_len 65536 type METADATA|RAID1 io_align 65536 io_width 65536 sector_size 4096 num_stripes 2 sub_stripes 0 stripe 0 devid 2 offset 9437184 dev_uuid 1e91c346-eba9-4a41-aeb2-d7efef64a5ea stripe 1 devid 1 offset 30408704 dev_uuid 653ea52e-f95f-417b-af6f-feb82ca49cd6 item 4 key (FIRST_CHUNK_TREE CHUNK_ITEM 567148544) itemoff 15751 itemsize 112 length 536739840 owner 2 stripe_len 65536 type DATA|RAID1 io_align 65536 io_width 65536 sector_size 4096 num_stripes 2 sub_stripes 0 stripe 0 devid 2 offset 546177024 dev_uuid 1e91c346-eba9-4a41-aeb2-d7efef64a5ea stripe 1 devid 1 offset 567148544 dev_uuid 653ea52e-f95f-417b-af6f-feb82ca49cd6 item 5 key (FIRST_CHUNK_TREE CHUNK_ITEM 1103888384) itemoff 15671 itemsize 80 length 268435456 owner 2 stripe_len 65536 type METADATA io_align 65536 io_width 65536 sector_size 4096 num_stripes 1 sub_stripes 1 stripe 0 devid 1 offset 1103888384 dev_uuid 653ea52e-f95f-417b-af6f-feb82ca49cd6 item 6 key (FIRST_CHUNK_TREE CHUNK_ITEM 1372323840) itemoff 15591 itemsize 80 length 33554432 owner 2 stripe_len 65536 type SYSTEM io_align 65536 io_width 65536 sector_size 4096 num_stripes 1 sub_stripes 1 stripe 0 devid 1 offset 1372323840 dev_uuid 653ea52e-f95f-417b-af6f-feb82ca49cd6 item 7 key (FIRST_CHUNK_TREE CHUNK_ITEM 1405878272) itemoff 15511 itemsize 80 length 536870912 owner 2 stripe_len 65536 type DATA io_align 65536 io_width 65536 sector_size 4096 num_stripes 1 sub_stripes 1 stripe 0 devid 1 offset 1405878272 dev_uuid 653ea52e-f95f-417b-af6f-feb82ca49cd6 item 8 key (FIRST_CHUNK_TREE CHUNK_ITEM 1942749184) itemoff 15399 itemsize 112 length 33554432 owner 2 stripe_len 65536 type SYSTEM|DUP io_align 65536 io_width 65536 sector_size 4096 num_stripes 2 sub_stripes 1 stripe 0 devid 1 offset 1942749184 dev_uuid 653ea52e-f95f-417b-af6f-feb82ca49cd6 stripe 1 devid 1 offset 1976303616 dev_uuid 653ea52e-f95f-417b-af6f-feb82ca49cd6 item 9 key (FIRST_CHUNK_TREE CHUNK_ITEM 1976303616) itemoff 15287 itemsize 112 length 134217728 owner 2 stripe_len 65536 type METADATA|DUP io_align 65536 io_width 65536 sector_size 4096 num_stripes 2 sub_stripes 1 stripe 0 devid 1 offset 2009858048 dev_uuid 653ea52e-f95f-417b-af6f-feb82ca49cd6 stripe 1 devid 1 offset 2144075776 dev_uuid 653ea52e-f95f-417b-af6f-feb82ca49cd6 item 10 key (FIRST_CHUNK_TREE CHUNK_ITEM 2110521344) itemoff 15175 itemsize 112 length 268435456 owner 2 stripe_len 65536 type DATA|DUP io_align 65536 io_width 65536 sector_size 4096 num_stripes 2 sub_stripes 1 stripe 0 devid 1 offset 2278293504 dev_uuid 653ea52e-f95f-417b-af6f-feb82ca49cd6 stripe 1 devid 1 offset 2546728960 dev_uuid 653ea52e-f95f-417b-af6f-feb82ca49cd6 10:/home/bor # Running btrfs balance start -f -ssoft,convert=raid1 -dsoft,convert=raid1 -msoft,convert=raid1 /mnt fixes it. I am not sure whether btrfs is expected to do it automatically as of now.