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Sat, 09 Feb 2019 13:16:16 +0100 Subject: Re: Cannot 'mount -o degraded /dev/replacement' after a replace To: =?UTF-8?Q?Jakob_Sch=c3=b6ttl?= , linux-btrfs@vger.kernel.org References: <2efee604-e44c-b00b-2ea8-d13ebc8c6355@gmail.com> From: Qu Wenruo Openpgp: preference=signencrypt Autocrypt: addr=quwenruo.btrfs@gmx.com; prefer-encrypt=mutual; keydata= mQENBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAG0IlF1IFdlbnJ1byA8cXV3ZW5ydW8uYnRyZnNAZ214LmNvbT6JAVQEEwEIAD4CGwMFCwkI BwIGFQgJCgsCBBYCAwECHgECF4AWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCWdWCnQUJCWYC bgAKCRDCPZHzoSX+qAR8B/94VAsSNygx1C6dhb1u1Wp1Jr/lfO7QIOK/nf1PF0VpYjTQ2au8 ihf/RApTna31sVjBx3jzlmpy+lDoPdXwbI3Czx1PwDbdhAAjdRbvBmwM6cUWyqD+zjVm4RTG rFTPi3E7828YJ71Vpda2qghOYdnC45xCcjmHh8FwReLzsV2A6FtXsvd87bq6Iw2axOHVUax2 FGSbardMsHrya1dC2jF2R6n0uxaIc1bWGweYsq0LXvLcvjWH+zDgzYCUB0cfb+6Ib/ipSCYp 3i8BevMsTs62MOBmKz7til6Zdz0kkqDdSNOq8LgWGLOwUTqBh71+lqN2XBpTDu1eLZaNbxSI ilaVuQENBFnVga8BCACqU+th4Esy/c8BnvliFAjAfpzhI1wH76FD1MJPmAhA3DnX5JDORcga CbPEwhLj1xlwTgpeT+QfDmGJ5B5BlrrQFZVE1fChEjiJvyiSAO4yQPkrPVYTI7Xj34FnscPj /IrRUUka68MlHxPtFnAHr25VIuOS41lmYKYNwPNLRz9Ik6DmeTG3WJO2BQRNvXA0pXrJH1fN GSsRb+pKEKHKtL1803x71zQxCwLh+zLP1iXHVM5j8gX9zqupigQR/Cel2XPS44zWcDW8r7B0 q1eW4Jrv0x19p4P923voqn+joIAostyNTUjCeSrUdKth9jcdlam9X2DziA/DHDFfS5eq4fEv ABEBAAGJATwEGAEIACYWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCWdWBrwIbDAUJA8JnAAAK CRDCPZHzoSX+qA3xB/4zS8zYh3Cbm3FllKz7+RKBw/ETBibFSKedQkbJzRlZhBc+XRwF61mi f0SXSdqKMbM1a98fEg8H5kV6GTo62BzvynVrf/FyT+zWbIVEuuZttMk2gWLIvbmWNyrQnzPl mnjK4AEvZGIt1pk+3+N/CMEfAZH5Aqnp0PaoytRZ/1vtMXNgMxlfNnb96giC3KMR6U0E+siA 4V7biIoyNoaN33t8m5FwEwd2FQDG9dAXWhG13zcm9gnk63BN3wyCQR+X5+jsfBaS4dvNzvQv h8Uq/YGjCoV1ofKYh3WKMY8avjq25nlrhzD/Nto9jHp8niwr21K//pXVA81R2qaXqGbql+zo Message-ID: <5441dc9d-a552-e77e-f74d-fe6ef702d400@gmx.com> Date: Sat, 9 Feb 2019 20:16:12 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.0 MIME-Version: 1.0 In-Reply-To: <2efee604-e44c-b00b-2ea8-d13ebc8c6355@gmail.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="3JVEzO07EazwOAMQ2VwloS7nzQ4rdAPoZ" X-Provags-ID: V03:K1:vR9xyFZfuL3810aXGa7INT+1xRmrxk/6cpJoTNt0DWyRQFbI1fd sR8j8OvY1eWiT/+Q449y3GFoxwClm7wwg5Rwu6WWS2m24uEH1fK4CvMeuh6cOI6cLjs44VN wAtP+gxoXNKilZru8xKOBlAJoKo8eNHoQ4Ak9a815KLDA95ZsUU6vzm4YCVLaVabA52x3Un E84xGs+UuOqDScexu838Q== X-UI-Out-Filterresults: notjunk:1;V03:K0:2olx1cFSzkY=:YRu72ckHSuP7U9/I3JtE7P UbLo3OJ6/t/uxHdFZoHq4WOu+CWAMHjQ3pyRW8qA7Ilh3EsD95QJxyjyaA5wYlm8fvUC/Yjj/ GS/T87uNXaNLWU2jd3maLDrPTLFFLDWGf6dTzsEuXLkNb4x51EKVaV5caIhOfuMpRXovBNyeZ DRpb3kK2mX0yS3kFGuMy4Lkoba3yxZeLL0Z6QqsLbZJ4Y/sRnhlOZwcOYezZFyGfE2dvXFW+B rkeNJ5SYiuOio5MTfltyZrmG4TtfvLPprP4whauganLkqqt6NHb9qUk6DhxsrVXULMZxcSKy0 Gvseh4LdgrHcF5Gn7/UCkOp0VGs2hAqhzS8cJW0eou+2SsBYAFoahR9xtMiZqdeqp0i/bhs2O PfEBm+K8ryGiA7MOMMdMRRHpeyGDiDHJhOWnHqyasNsib2splfB7pc2baB8nLl2Bsvsue7YCK Mrfr+4Gt6qQnwMpNiVHMybvY+4QgiYfEpZMwNVA3FY2ZZ4nvovenjLH9CvT4j9CzsvdDYCNxQ H9NS85U9mAYLlxGVlqARE84cJ+eTTXAfj1/2pE1psHlJxV3nAw0nLXEqcpu+QZKcEIuDTsu5Q Y3kF7PL+W5z4a6ygGWQ6JG4B+0fzjk7gPA5HSr69NjsiGujbyO9CblbpZhQbSqRdhOfIC2hhz DNY3hyr8pB2nafP2YFoDO4R2/rC9LTSOuFRjKmNMqd/+nskQZxtwdNWmWiSHLQ+owZYiOeiuk Ovv1va9/RBoI6/7tWRCcmmnEBq9boXnHPBOO9XWMLgBk/sT13jxH5tGs7ykCBzSkO8jomF8UN QWRgy7s/dgjhLW5DDMNSoC68FjtUPeSk8ujwVIhmpZ1MTZ3fTi/RApjVyQbyZQPHP6ksFdKCz mkb2VQt88UkrG4Y8Pmz4Y8JTPW1oXLxvAiXfkRsYbOy6QWdO9oisXQNCClClcF Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --3JVEzO07EazwOAMQ2VwloS7nzQ4rdAPoZ Content-Type: multipart/mixed; boundary="AC0uvjwxeQFqzFTkNggmCBdNUGLE5Mz64"; protected-headers="v1" From: Qu Wenruo To: =?UTF-8?Q?Jakob_Sch=c3=b6ttl?= , linux-btrfs@vger.kernel.org Message-ID: <5441dc9d-a552-e77e-f74d-fe6ef702d400@gmx.com> Subject: Re: Cannot 'mount -o degraded /dev/replacement' after a replace References: <2efee604-e44c-b00b-2ea8-d13ebc8c6355@gmail.com> In-Reply-To: <2efee604-e44c-b00b-2ea8-d13ebc8c6355@gmail.com> --AC0uvjwxeQFqzFTkNggmCBdNUGLE5Mz64 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 2019/2/9 =E4=B8=8B=E5=8D=886:36, Jakob Sch=C3=B6ttl wrote: > Hi, >=20 > I've setup a RAID1 with two disks (disk1 and disk2) and I'm testing the= > btrfs replace command. >=20 > 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). >=20 > I cannot mount the replacement disk3 if disk1 is unplugged. Sounds like there is one single chunk on disk1, which caused the problem.= >=20 >> mount: /mnt: wrong fs type, bad option, bad superblock on /dev/loop3, > missing codepage or helper program, or other error. dmesg please. And btrfs-progs version please. 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. Thanks, Qu >=20 > What I expect is that both disk1 and disk3 are fully valid and working > after a replace. >=20 > Steps to reproduce: >=20 > =C2=A0 dd if=3D/dev/zero of=3D/vdisk1 bs=3D1024 count=3D300000 > =C2=A0 losetup /dev/loop1 /vdisk1 > =C2=A0 dd if=3D/dev/zero of=3D/vdisk2 bs=3D1024 count=3D300000 > =C2=A0 losetup /dev/loop2 /vdisk2 > =C2=A0 dd if=3D/dev/zero of=3D/vdisk3 bs=3D1024 count=3D300000 > =C2=A0 # losetup /dev/loop3 /vdisk3=C2=A0=C2=A0=C2=A0 # don't plug this= device yet >=20 > Create RAID1 file system: >=20 > =C2=A0 mkfs.btrfs -L datavol -m raid1 -d raid1 /dev/loop1 /dev/loop2 >=20 > Unplug device 2 to simulate a defect: >=20 > =C2=A0 losetup -d /dev/loop2 >=20 > Plug device 3: >=20 > =C2=A0 losetup /dev/loop3 /vdisk3 >=20 > Replace device 2 with device 3: >=20 > =C2=A0 mount -o degraded /dev/loop1 /mnt > =C2=A0 btrfs filesystem show=C2=A0=C2=A0 # to get devid of device 2 > =C2=A0 btrfs replace start -Br 2 /dev/loop3 /mnt > =C2=A0 btrfs replace status /mnt=C2=A0=C2=A0 # check success > =C2=A0 umount /mnt >=20 > Unplug the original device 1 to see if device 3 has really replaced > device 2: >=20 > =C2=A0 losetup -d /dev/loop1 > =C2=A0 mount -o degraded /dev/loop3 /mnt >=20 > The mount fails with this error: >=20 >> mount: /mnt: wrong fs type, bad option, bad superblock on /dev/loop3, > missing codepage or helper program, or other error. >=20 > In this situation, btrfs device scan does not change anything and btrfs= > filesystem show shows: >=20 >> 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=3D198180864, have=3D0 >> ERROR: cannot read chunk root >> Label: 'datavol'=C2=A0 uuid: 640e45d3-e741-4a78-a24e-2d8a41c6b8c3 >> =C2=A0=C2=A0=C2=A0 Total devices 2 FS bytes used 128.00KiB >> =C2=A0=C2=A0=C2=A0 devid=C2=A0=C2=A0=C2=A0 2 size 292.97MiB used 104.0= 0MiB path /dev/loop3 >> =C2=A0=C2=A0=C2=A0 *** Some devices missing >=20 > Is this a known problem? Can you reproduce it? Am I doing something wro= ng? >=20 > Regards, Jakob >=20 --AC0uvjwxeQFqzFTkNggmCBdNUGLE5Mz64-- --3JVEzO07EazwOAMQ2VwloS7nzQ4rdAPoZ Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEELd9y5aWlW6idqkLhwj2R86El/qgFAlxexI0ACgkQwj2R86El /qiWGwf6A3wibmp3iXQ4hD0e6DyWxmj1JPPE3JdMMu/CMEI1GS95GiVjYFOZSWi2 LS6NUkB52lQHW5s7bsmUWFpHH6fgWF4S3fR7g8XUlikzKeCv2gyI4z+QNf5hmYj5 tgCJCMwYjCLktYx2k6RI8cHrC6sVMFaB138Ouant0p0ty3wpZVT5NHr0JJOLG9zM Gs2sVOmUHgRUaz73AjSV4AQSE3/b3rU6Yxz/SjX7Egojiw+O748kzDgR4HhR9J2v LmVH8r9QhMGo/x4kZBED/o/vhbb2li4hsQKXm7kMbHhnXa2gvR+Qw/JydtkyEOe8 5zZttO8R/CzdFNATGzne9RwcuEKm9Q== =/etQ -----END PGP SIGNATURE----- --3JVEzO07EazwOAMQ2VwloS7nzQ4rdAPoZ--