NAME

       ceph-osd - ceph object storage daemon

SYNOPSIS

       ceph-osd -i osdnum [ --osd-data datapath ] [ --osd-journal
       journal ] [ --mkfs ] [ --mkjournal ] [ --mkkey ]

DESCRIPTION

       ceph-osd  is  the  object  storage  daemon  for  the  Ceph  distributed file system. It is
       responsible for storing objects on a local file system and providing access to  them  over
       the network.

       The  datapath  argument should be a directory on a btrfs file system where the object data
       resides. The journal is optional, and is only useful performance-wise when it resides on a
       different disk than datapath with low latency (ideally, an NVRAM device).

OPTIONS

       -f, --foreground
              Foreground:  do  not daemonize after startup (run in foreground). Do not generate a
              pid file. Useful when run via ceph-run(8).

       -d     Debug mode: like -f, but also send all log output to stderr.

       --setuser userorgid
              Set uid after starting.  If a username is specified, the user record is  looked  up
              to  get a uid and a gid, and the gid is also set as well, unless --setgroup is also
              specified.

       --setgroup grouporgid
              Set gid after starting.  If a group name is specified the group record is looked up
              to get a gid.

       --osd-data osddata
              Use object store at osddata.

       --osd-journal journal
              Journal updates to journal.

       --mkfs Create  an  empty  object  repository. This also initializes the journal (if one is
              defined).

       --mkkey
              Generate a new secret key. This is normally used in combination with --mkfs  as  it
              is more convenient than generating a key by hand with ceph-authtool(8).

       --mkjournal
              Create  a  new journal file to match an existing object repository.  This is useful
              if the journal device or file is wiped out due to a disk or file system failure.

       --flush-journal
              Flush the journal to permanent store. This runs in the foreground so you know  when
              it's  completed.  This  can  be useful if you want to resize the journal or need to
              otherwise destroy it: this guarantees you won't lose data.

       --get-cluster-fsid
              Print the cluster fsid (uuid) and exit.

       --get-osd-fsid
              Print the OSD's fsid and exit.  The OSD's uuid is generated at --mkfs time  and  is
              thus unique to a particular instantiation of this OSD.

       --get-journal-fsid
              Print  the journal's uuid.  The journal fsid is set to match the OSD fsid at --mkfs
              time.

       -c ceph.conf, --conf=ceph.conf
              Use ceph.conf configuration file instead of  the  default  /etc/ceph/ceph.conf  for
              runtime configuration options.

       -m monaddress[:port]
              Connect to specified monitor (instead of looking through ceph.conf).

AVAILABILITY

       ceph-osd  is  part of Ceph, a massively scalable, open-source, distributed storage system.
       Please refer to the Ceph documentation at http://ceph.com/docs for more information.

SEE ALSO

       ceph(8), ceph-mds(8), ceph-mon(8), ceph-authtool(8)

COPYRIGHT

       2010-2014, Inktank  Storage,  Inc.  and  contributors.  Licensed  under  Creative  Commons
       Attribution Share Alike 3.0 (CC-BY-SA-3.0)