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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