Likely the differences you're seeing of /dev/sdb1 and tmpfs have to do with how ceph-disk vs ceph-volume manage the OSDs and what their defaults are. ceph-disk will create partitions on devices while ceph-volume configures LVM on the block device. Also with bluestore you do not have a standard filesystem, so ceph-volume creates a mock folder to place the necessary information into /var/lib/ceph/osd/ceph-0 to track the information for the OSD and how to start it.
On Wed, Apr 4, 2018 at 6:20 PM Gregory Farnum <gfar...@redhat.com> wrote: > On Tue, Apr 3, 2018 at 6:30 PM Jeffrey Zhang < > zhang.lei.fly+ceph-us...@gmail.com> wrote: > >> I am testing ceph Luminous, the environment is >> >> - centos 7.4 >> - ceph luminous ( ceph offical repo) >> - ceph-deploy 2.0 >> - bluestore + separate wal and db >> >> I found the ceph osd folder `/var/lib/ceph/osd/ceph-0` is mounted >> from tmpfs. But where the files in that folder come from? like `keyring`, >> `whoami`? >> > > These are generated as part of the initialization process. I don't know > the exact commands involved, but the keyring for instance will draw from > the results of "ceph osd new" (which is invoked by one of the ceph-volume > setup commands). That and whoami are part of the basic information an OSD > needs to communicate with a monitor. > -Greg > > >> >> $ ls -alh /var/lib/ceph/osd/ceph-0/ >> lrwxrwxrwx. 1 ceph ceph 24 Apr 3 16:49 block -> >> /dev/ceph-pool/osd0.data >> lrwxrwxrwx. 1 root root 22 Apr 3 16:49 block.db -> >> /dev/ceph-pool/osd0-db >> lrwxrwxrwx. 1 root root 23 Apr 3 16:49 block.wal -> >> /dev/ceph-pool/osd0-wal >> -rw-------. 1 ceph ceph 37 Apr 3 16:49 ceph_fsid >> -rw-------. 1 ceph ceph 37 Apr 3 16:49 fsid >> -rw-------. 1 ceph ceph 55 Apr 3 16:49 keyring >> -rw-------. 1 ceph ceph 6 Apr 3 16:49 ready >> -rw-------. 1 ceph ceph 10 Apr 3 16:49 type >> -rw-------. 1 ceph ceph 2 Apr 3 16:49 whoami >> >> I guess they may be loaded from bluestore. But I can not find any clue >> for this. >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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