On 10/03/2014 03:37 PM, Slava Pestov wrote:
> Please include any bcache messages printed in dmesg when this happens.
[87579.418945] bcache: bch_cached_dev_attach() Can't attach dm-4: already attached
[87579.418947] bcache: __cached_dev_store() Can't attach 8246b830-95d4-420d-aff8-894efc348801
[87579.418947] : cache set not found
For completeness, these are the steps are performed, soup to nuts:
# wipefs -a /dev/dm-4
4 bytes [58 46 53 42] erased at offset 0x0 (xfs)
# wipefs -a /dev/dm-7
4 bytes [58 46 53 42] erased at offset 0x0 (xfs)
# wipefs -a /dev/sdc
# ./make-bcache -B /dev/dm-4 /dev/dm-7 -C /dev/sdc
Already a bcache device on /dev/sdc, overwrite with --wipe-bcache
# ./make-bcache -B /dev/dm-4 /dev/dm-7 -C /dev/sdc --wipe-bcache
UUID: 501486ea-d614-4a32-a137-bc8e004fcb85
Set UUID: 8246b830-95d4-420d-aff8-894efc348801
version: 0
nbuckets: 761856
block_size: 1
bucket_size: 1024
nr_in_set: 1
nr_this_dev: 0
first_bucket: 1
UUID: 261cf532-ca93-45b7-a8fb-1eff57078953
Set UUID: 8246b830-95d4-420d-aff8-894efc348801
version: 1
block_size: 1
data_offset: 16
UUID: eeca31ab-a632-4d7b-94f6-35e9b878344f
Set UUID: 8246b830-95d4-420d-aff8-894efc348801
version: 1
block_size: 1
data_offset: 16
# echo /dev/dm-4 > /sys/fs/bcache/register
# echo /dev/dm-7 > /sys/fs/bcache/register
# echo /dev/sdc > /sys/fs/bcache/register
# ls -la /dev/b*
brw-rw---- 1 root disk 253, 0 Oct 3 14:39 /dev/bcache0
brw-rw---- 1 root disk 253, 1 Oct 3 14:39 /dev/bcache1
# mkfs.xfs /dev/bcache0
meta-data=/dev/bcache0 isize=256 agcount=44, agsize=268435455 blks
= sectsz=512 attr=2, projid32bit=0
data = bsize=4096 blocks=11709285374, imaxpct=5
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0
log =internal log bsize=4096 blocks=521728, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
# mkfs.xfs /dev/bcache1
meta-data=/dev/bcache1 isize=256 agcount=44, agsize=268435455 blks
= sectsz=512 attr=2, projid32bit=0
data = bsize=4096 blocks=11709285374, imaxpct=5
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0
log =internal log bsize=4096 blocks=521728, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
# mount -o inode64,nobarrier,noatime,nodiratime /dev/bcache0 /mnt/V1A
# mount -o inode64,nobarrier,noatime,nodiratime /dev/bcache1 /mnt/V2A
# ls -la /sys/fs/bcache
total 0
drwxr-xr-x 3 root root 0 Oct 3 14:39 .
drwxr-xr-x 6 root root 0 Oct 2 16:32 ..
drwxr-xr-x 7 root root 0 Oct 3 14:50 8246b830-95d4-420d-aff8-894efc348801
--w------- 1 root root 4096 Oct 3 14:39 register
--w------- 1 root root 4096 Oct 3 14:50 register_quiet
# echo 8246b830-95d4-420d-aff8-894efc348801 > /sys/block/bcache0/bcache/attach
bash: echo: write error: Invalid argument
> On Fri, Oct 3, 2014 at 1:21 PM, Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx> wrote:
>> # ls -la /sys/fs/bcache
>> total 0
>> drwxr-xr-x 3 root root 0 Oct 3 14:39 .
>> drwxr-xr-x 6 root root 0 Oct 2 16:32 ..
>> drwxr-xr-x 7 root root 0 Oct 3 14:50 8246b830-95d4-420d-aff8-894efc348801
>> --w------- 1 root root 4096 Oct 3 14:39 register
>> --w------- 1 root root 4096 Oct 3 14:50 register_quiet
>>
>>
>> # echo 8246b830-95d4-420d-aff8-894efc348801 > /sys/block/bcache0/bcache/attach
>> bash: echo: write error: Invalid argument
>>
>>
>> What's the problem here?
>>
>> Thanks,
>> Stan
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