I have a 4 disk array on top of 120GB bcache setup, arranged as follows
dev/sda1: UUID="42AE-12E3" TYPE="vfat" PARTLABEL="EFI System"
PARTUUID="d337c56a-fb0f-4e87-8d5f-a89122c81167"
/dev/sda2: UUID="06e3ce52-f34a-409a-a143-3c04f1d334ff" TYPE="ext4"
PARTLABEL="Linux filesystem"
PARTUUID="d2d3fa93-eebf-41ab-8162-d81722bf47ec"
/dev/sda4: UUID="b729c490-81f0-461f-baa2-977af9a7b6d9" TYPE="bcache"
PARTLABEL="Linux filesystem"
PARTUUID="84548857-f504-440a-857f-c0838c1eb83d"
/dev/sdb1: UUID="6016277c-143d-46b4-ae4e-8565ffc8158f" TYPE="swap"
PARTLABEL="Linux swap" PARTUUID="8692bf67-7271-4bf6-a623-b79d74093f2c"
/dev/sdb2: UUID="bc93c5e2-705a-4cbe-bcd9-7be1181163b2" TYPE="bcache"
PARTLABEL="Linux filesystem"
PARTUUID="662a450b-3592-4929-9647-8e8a1dedae69"
/dev/sdc1: UUID="9df21d4e-de02-4000-b684-5fb95d4d0492" TYPE="swap"
PARTLABEL="Linux swap" PARTUUID="ed9d7b8e-5480-4e70-b983-1a350ecae38a"
/dev/sdc2: UUID="7d8feaf6-aa6a-4b13-af49-0ad1bd1efb64" TYPE="bcache"
PARTLABEL="Linux filesystem"
PARTUUID="d343e23a-39ed-4061-80a2-55b66e20ecc1"
/dev/sdd1: UUID="18defba2-594b-402e-b3b2-8e38035c624d" TYPE="swap"
PARTLABEL="Linux swap" PARTUUID="fed9ffd6-0480-4496-8e6d-02d263d719b7"
/dev/sdd2: UUID="be0f0381-0d7e-46c9-ad04-01415bfc6f61" TYPE="bcache"
PARTLABEL="Linux filesystem"
PARTUUID="8f56de8a-105f-4d56-b699-59e1215b3c6b"
/dev/bcache32: UUID="38d5de43-28fb-40a9-a535-dbf17ff52e75"
UUID_SUB="731c31f1-51dd-477a-9bd1-fac73d0e6f69" TYPE="btrfs"
/dev/sde: UUID="05514ad3-d90a-4e90-aa11-7c6d34515ca2" TYPE="bcache"
/dev/bcache16: UUID="38d5de43-28fb-40a9-a535-dbf17ff52e75"
UUID_SUB="79cbcaf1-40b9-4954-a977-537ed3310e76" TYPE="btrfs"
/dev/bcache0: UUID="38d5de43-28fb-40a9-a535-dbf17ff52e75"
UUID_SUB="42d3a0dd-fbec-4318-9a5b-6d96aa1f6328" TYPE="btrfs"
/dev/bcache48: UUID="38d5de43-28fb-40a9-a535-dbf17ff52e75"
UUID_SUB="cb7018d6-a27d-493e-b41f-e45c64f6873a" TYPE="btrfs"
/dev/sda3: PARTUUID="d9fa3100-5044-4e10-9f2f-f8037786a43f"
ubuntu 17.10 with PPA Kernels up to 4.13.x all mount this array
perfectly, and the performance of the cache is as expected.
Upgraded today to 4.14.1 from their PPA and the
running btrfs dev scan finds the btrfs filesystem devices bcache16 and
bcache32, bcache0 and bcache48 are not recognised, and thus the file
system will not mount.
according bcache all devices are present, and attached to the cache
device correctly.
btrfs fi on Kernel 4.13 gives
Label: none uuid: 38d5de43-28fb-40a9-a535-dbf17ff52e75
Total devices 4 FS bytes used 2.03TiB
devid 1 size 1.82TiB used 1.07TiB path /dev/bcache16
devid 2 size 1.82TiB used 1.07TiB path /dev/bcache32
devid 3 size 1.82TiB used 1.07TiB path /dev/bcache0
devid 4 size 1.82TiB used 1.07TiB path /dev/bcache48
Where do I start in debugging this?
btrfs-progs v4.12
btrfs fi df /
Data, RAID5: total=3.20TiB, used=2.02TiB
System, RAID5: total=192.00MiB, used=288.00KiB
Metadata, RAID5: total=6.09GiB, used=3.69GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
There are no errors in the dmesg that I can see from btrfs scan,
simply the two devices are not found.
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