Did you check the permissions of those directories?
Part of the steps in the upgrade process mentions the following:
chown -R ceph:ceph /var/lib/ceph
Tom Walsh
0 ceph version 10.2.1 (3a66dd4f30852819c1bdaa8ec23c795d4ad77269), process ceph-osd, pid 22401
2016-05-13 10:51:39.416511 7fe486e73800 0 pidfile_write: ignore empty --pid-file
2016-05-13 10:51:39.423336 7fe486e73800 -1 filestore(/var/lib/ceph/osd/ceph-6) FileStore::mount: unable to access basedir '/var/lib/ceph/osd/ceph-6': (13) Permission denied
2016-05-13 10:51:39.423342 7fe486e73800 -1 osd.6 0 OSD:init: unable to mount object store
2016-05-13 10:51:39.423348 7fe486e73800 -1 ** ERROR: osd init failed: (13) Permission denied
2016-05-13 10:51:39.572099 7f4d86a68800 0 set uid:gid to 1000:1000 (ceph:ceph)
2016-05-13 10:51:39.572126 7f4d86a68800 0 ceph version 10.2.1 (3a66dd4f30852819c1bdaa8ec23c795d4ad77269), process ceph-osd, pid 22530
2016-05-13 10:51:39.573744 7f4d86a68800 0 pidfile_write: ignore empty --pid-file
2016-05-13 10:51:39.580543 7f4d86a68800 -1 filestore(/var/lib/ceph/osd/ceph-6) FileStore::mount: unable to access basedir '/var/lib/ceph/osd/ceph-6': (13) Permission denied
2016-05-13 10:51:39.580549 7f4d86a68800 -1 osd.6 0 OSD:init: unable to mount object store
2016-05-13 10:51:39.580554 7f4d86a68800 -1 ** ERROR: osd init failed: (13) Permission denied
2016-05-13 10:51:39.798196 7fc0daf80800 0 set uid:gid to 1000:1000 (ceph:ceph)
2016-05-13 10:51:39.798222 7fc0daf80800 0 ceph version 10.2.1 (3a66dd4f30852819c1bdaa8ec23c795d4ad77269), process ceph-osd, pid 22724
2016-05-13 10:51:39.799923 7fc0daf80800 0 pidfile_write: ignore empty --pid-file
2016-05-13 10:51:39.806382 7fc0daf80800 -1 filestore(/var/lib/ceph/osd/ceph-6) FileStore::mount: unable to access basedir '/var/lib/ceph/osd/ceph-6': (13) Permission denied
2016-05-13 10:51:39.806387 7fc0daf80800 -1 osd.6 0 OSD:init: unable to mount object store
2016-05-13 10:51:39.806390 7fc0daf80800 -1 ** ERROR: osd init failed: (13) Permission denied
2016-05-13 10:51:39.954085 7feb28741800 0 set uid:gid to 1000:1000 (ceph:ceph)
2016-05-13 10:51:39.954112 7feb28741800 0 ceph version 10.2.1 (3a66dd4f30852819c1bdaa8ec23c795d4ad77269), process ceph-osd, pid 22888
2016-05-13 10:51:39.955839 7feb28741800 0 pidfile_write: ignore empty --pid-file
2016-05-13 10:51:39.962785 7feb28741800 -1 filestore(/var/lib/ceph/osd/ceph-6) FileStore::mount: unable to access basedir '/var/lib/ceph/osd/ceph-6': (13) Permission denied
2016-05-13 10:51:39.962791 7feb28741800 -1 osd.6 0 OSD:init: unable to mount object store
2016-05-13 10:51:39.962796 7feb28741800 -1 ** ERROR: osd init failed: (13) Permission denied
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