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.

       --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 the  Ceph  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 BY-SA