chen@admin-node:/etc/ceph$ rados --help

usage: rados [options] [commands]

POOL COMMANDS

   lspools                          list pools

   mkpool <pool-name> [[ ]]     create pool <pool-name>'

                                    [with auid [and using crush rule ]]

   cppool <pool-name> <dest-pool>   copy content of a pool

   rmpool <pool-name> [<pool-name> --yes-i-really-really-mean-it]

                                    remove pool <pool-name>'

   df                               show per-pool and total usage

   ls                               list objects in pool

   chown                         change the pool owner to auid 

POOL SNAP COMMANDS

   lssnap                           list snaps

   mksnap <snap-name>               create snap <snap-name>

   rmsnap <snap-name>               remove snap <snap-name>

OBJECT COMMANDS

   get <obj-name> [outfile]         fetch object

   put <obj-name> [infile]          write object

   truncate <obj-name> length       truncate object

   create <obj-name>                create object

   rm <obj-name> ...                remove object(s)

   cp <obj-name> [target-obj]       copy object

   clonedata <src-obj> <dst-obj>    clone object data

   listxattr <obj-name>

   getxattr <obj-name> attr

   setxattr <obj-name> attr val

   rmxattr <obj-name> attr

   stat objname                     stat the named object

   mapext <obj-name>

   rollback <obj-name> <snap-name>  roll back object to snap <snap-name>

   listsnaps <obj-name>             list the snapshots of this object

   bench <seconds> write|seq|rand [-t concurrent_operations] [--no-cleanup] [--run-name run_name]

                                    default is  concurrent IOs and  MB ops

                                    default is to clean up after write benchmark

                                    default run-name is 'benchmark_last_metadata'

   cleanup [--run-name run_name] [--prefix prefix]

                                    clean up a previous benchmark operation

                                    default run-name is 'benchmark_last_metadata'

   load-gen [options]               generate load on the cluster

   listomapkeys <obj-name>          list the keys in the object map

   listomapvals <obj-name>          list the keys and vals in the object map

   getomapval <obj-name> <key> [file] show the value for the specified key

                                    in the object's object map

   setomapval <obj-name> <key> <val>

   rmomapkey <obj-name> <key>

   getomapheader <obj-name> [file]

   setomapheader <obj-name> <val>

   tmap-to-omap <obj-name>          convert tmap keys/values to omap

   watch <obj-name>                 add watcher on this object

   notify <obj-name> <message>      notify wather of this object with message

   listwatchers <obj-name>          list the watchers of this object

   set-alloc-hint <obj-name> <expected-object-size> <expected-write-size>

                                    set allocation hint for an object

IMPORT AND EXPORT

   import [options] <local-directory> <rados-pool>

       Upload <local-directory> to <rados-pool>

   export [options] <rados-pool> <local-directory>

       Download <rados-pool> to <local-directory>

   options:

       -f / --force                 Copy everything, even if it hasn't changed.

       -d / --delete-after          After synchronizing, delete unreferenced

                                    files or objects from the target bucket

                                    or directory.

       --workers                    Number of worker threads to spawn

                                    (default )

ADVISORY LOCKS

   lock list <obj-name>

       List all advisory locks on an object

   lock get <obj-name> <lock-name>

       Try to acquire a lock

   lock break <obj-name> <lock-name> <locker-name>

       Try to break a lock acquired by another client

   lock info <obj-name> <lock-name>

       Show lock information

   options:

       --lock-tag                   Lock tag, all locks operation should use

                                    the same tag

       --lock-cookie                Locker cookie

       --lock-description           Description of lock

       --lock-duration              Lock duration (in seconds)

       --lock-type                  Lock type (shared, exclusive)

CACHE POOLS: (for testing/development only)

   cache-flush <obj-name>           flush cache pool object (blocking)

   cache-try-flush <obj-name>       flush cache pool object (non-blocking)

   cache-evict <obj-name>           evict cache pool object

   cache-flush-evict-all            flush+evict all objects

   cache-try-flush-evict-all        try-flush+evict all objects

GLOBAL OPTIONS:

   --object_locator object_locator

        set object_locator for operation

   -p pool

   --pool=pool

        select given pool by name

   --target-pool=pool

        select target pool by name

   -b op_size

        set the size of write ops for put or benchmarking

   -s name

   --snap name

        select given snap name for (read) IO

   -i infile

   --create

        create the pool or directory that was specified

   -N namespace

   --namespace=namespace

        specify the namespace to use for the object

   --all

        Use with ls to list objects in all namespaces

        Put in CEPH_ARGS environment variable to make this the default

   --default

        Use with ls to list objects in default namespace

        Takes precedence over --all in case --all is in environment

   --target-locator

        Use with cp to specify the locator of the new object

   --target-nspace

        Use with cp to specify the namespace of the new object

BENCH OPTIONS:

   -t N

   --concurrent-ios=N

        Set number of concurrent I/O operations

   --show-time

        prefix output with date/time

LOAD GEN OPTIONS:

   --num-objects                    total number of objects

   --min-object-size                min object size

   --max-object-size                max object size

   --min-ops                        min number of operations

   --max-ops                        max number of operations

   --max-backlog                    max backlog (in MB)

   --percent                        percent of operations that are read

   --target-throughput              target throughput (in MB)

   --run-length                     total time (in seconds)