What's the trick to overcoming unsupported features error when mapping an erasure-coded rbd? This is on Ceph Luminous 12.1.1, Ubuntu Xenial, Kernel 4.10.0-26-lowlatency.
Steps to replicate:
$ ceph osd pool create rbd_data 32 32 erasure default
pool 'rbd_data' created
$ ceph osd pool set rbd_data allow_ec_overwrites true
set pool 109 allow_ec_overwrites to true
$ ceph osd pool create rbd 4
pool 'rbd' created
$ rbd create --size 4G --data-pool rbd_data rbd/rbdvolume
$ sudo rbd map rbdvolume --name client.admin
rbd: sysfs write failed
RBD image feature set mismatch. Try disabling features unsupported by the kernel with "rbd feature disable".
In some cases useful info is found in syslog - try "dmesg | tail".
rbd: map failed: (6) No such device or address
$ dmesg | tail -1
[37186.297080] rbd: image rbdvolume: image uses unsupported features: 0xb8
$ rbd info rbd/rbdvolume
rbd image 'rbdvolume':
size 4096 MB in 1024 objects
order 22 (4096 kB objects)
data_pool: rbd_data
block_name_prefix: rbd_data.110.16f501643c9869
format: 2
features: layering, exclusive-lock, object-map, fast-diff, deep-flatten, data-pool
flags:
create_timestamp: Thu Jul 20 07:26:04 2017
$ rbd feature disable rbd/rbdvolume exclusive-lock object-map fast-diff deep-flatten
$ rbd info rbd/rbdvolume
rbd image 'rbdvolume':
size 4096 MB in 1024 objects
order 22 (4096 kB objects)
data_pool: rbd_data
block_name_prefix: rbd_data.110.16f501643c9869
format: 2
features: layering, data-pool
flags:
create_timestamp: Thu Jul 20 07:26:04 2017
$ sudo rbd map rbdvolume --name client.admin
rbd: sysfs write failed
RBD image feature set mismatch. Try disabling features unsupported by the kernel with "rbd feature disable".
In some cases useful info is found in syslog - try "dmesg | tail".
rbd: map failed: (6) No such device or address
$ dmesg | tail -1
[39497.580221] rbd: image rbdvolume: image uses unsupported features: 0x80
Thank you,
Roger
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