Provided by: ceph-common_19.2.1-0ubuntu0.24.04.2_amd64 
NAME
rados - rados object storage utility
SYNOPSIS
rados [ options ] [ command ]
DESCRIPTION
rados is a utility for interacting with a Ceph object storage cluster (RADOS), part of the Ceph
distributed storage system.
GLOBAL OPTIONS
--object-locator object_locator
Set object_locator for operation.
-p pool, --pool pool
Interact with the given pool. Required by most commands.
--target-pool pool
Select target pool by name.
--pgid As an alternative to --pool, --pgid also allow users to specify the PG id to which the command
will be directed. With this option, certain commands like ls allow users to limit the scope of the
command to the given PG.
-N namespace, --namespace namespace
Specify the rados 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.
-s snap, --snap snap
Read from the given pool snapshot. Valid for all pool-specific read operations.
--create
Create the pool or directory that was specified.
-i infile
will specify an input file to be passed along as a payload with the command to the monitor
cluster. This is only used for specific monitor commands.
-m monaddress[:port]
Connect to specified monitor (instead of looking through ceph.conf).
-b block_size
Set the block size for put/get/append ops and for write benchmarking.
--striper
Uses the striping API of rados rather than the default one. Available for stat, stat2, get, put,
append, truncate, rm, ls and all xattr related operation.
-O object_size, --object-size object_size
Set the object size for put/get ops and for write benchmarking.
--max-objects
Set the max number of objects for write benchmarking.
--lock-cookie locker-cookie
Will set the lock cookie for acquiring advisory lock (lock get command). If the cookie is not
empty, this option must be passed to lock break command to find the correct lock when releasing
lock.
--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.
--no-verify
Do not verify contents of read objects.
--write-object
Write contents to the objects.
--write-omap
Write contents to the omap.
--write-xattr
Write contents to the extended attributes.
LOAD GEN OPTIONS
--num-objects
Total number of objects.
--min-object-size
Min object size.
--max-object-size
Max object size.
--min-op-len
Min io size of operations.
--max-op-len
Max io size of operations.
--max-ops
Max number of operations.
--max-backlog
Max backlog size.
--read-percent
Percent of operations that are read.
--target-throughput
Target throughput (in bytes).
--run-length
Total time (in seconds).
--offset-align
At what boundary to align random op offsets.
CACHE POOLS OPTIONS
--with-clones
Include clones when doing flush or evict.
OMAP OPTIONS
--omap-key-file file
Read the omap key from a file.
GENERIC OPTIONS
-c FILE, --conf FILE
Read configuration from the given configuration file.
--id ID
Set ID portion of my name.
-n TYPE.ID, --name TYPE.ID
Set cephx user name.
--cluster NAME
Set cluster name (default: ceph).
--setuser USER
Set uid to user or uid (and gid to user's gid).
--setgroup GROUP
Set gid to group or gid.
--version
Show version and quit.
GLOBAL COMMANDS
lspools
List object pools
df Show utilization statistics, including disk usage (bytes) and object counts, over the entire
system and broken down by pool.
list-inconsistent-pg pool
List inconsistent PGs in given pool.
list-inconsistent-obj pgid
List inconsistent objects in given PG.
list-inconsistent-snapset pgid
List inconsistent snapsets in given PG.
POOL SPECIFIC COMMANDS
get name outfile
Read object name from the cluster and write it to outfile.
put name infile [--offset offset]
Write object name with start offset (default:0) to the cluster with contents from infile.
Warning: The put command creates a single RADOS object, sized just as large as your input file.
Unless your objects are of reasonable and consistent sizes, that is probably not what you want --
consider using RGW/S3, CephFS, or RBD instead.
append name infile
Append object name to the cluster with contents from infile.
rm [--force-full] name ...
Remove object(s) with name(s). With --force-full will remove when cluster is marked full.
listwatchers name
List the watchers of object name.
ls outfile
List objects in the given pool and write to outfile. Instead of --pool if --pgid will be
specified, ls will only list the objects in the given PG.
lssnap List snapshots for given pool.
clonedata srcname dstname --object-locator key
Clone object byte data from srcname to dstname. Both objects must be stored with the locator key
key (usually either srcname or dstname). Object attributes and omap keys are not copied or
cloned.
mksnap foo
Create pool snapshot named foo.
rmsnap foo
Remove pool snapshot named foo.
bench seconds mode [ -b objsize ] [ -t threads ]
Benchmark for seconds. The mode can be write, seq, or rand. seq and rand are read benchmarks,
either sequential or random. Before running one of the reading benchmarks, run a write benchmark
with the --no-cleanup option. The default object size is 4 MB, and the default number of simulated
threads (parallel writes) is 16. The --run-name <label> option is useful for benchmarking a
workload test from multiple clients. The <label> is an arbitrary object name. It is
"benchmark_last_metadata" by default, and is used as the underlying object name for "read" and
"write" ops. Note: -b objsize option is valid only in write mode. Note: write and seq must be
run on the same host otherwise the objects created by write will have names that will fail seq.
cleanup [ --run-name run_name ] [ --prefix prefix ]
Clean up a previous benchmark operation. Note: the default run-name is "benchmark_last_metadata"
listxattr name
List all extended attributes of an object.
getxattr name attr
Dump the extended attribute value of attr of an object.
setxattr name attr value
Set the value of attr in the extended attributes of an object.
rmxattr name attr
Remove attr from the extended attributes of an object.
stat name
Get stat (ie. mtime, size) of given object
stat2 name
Get stat (similar to stat, but with high precision time) of given object
listomapkeys name
List all the keys stored in the object map of object name.
listomapvals name
List all key/value pairs stored in the object map of object name. The values are dumped in
hexadecimal.
getomapval [ --omap-key-file file ] name key [ out-file ]
Dump the hexadecimal value of key in the object map of object name. If the optional out-file
argument is not provided, the value will be written to standard output.
setomapval [ --omap-key-file file ] name key [ value ]
Set the value of key in the object map of object name. If the optional value argument is not
provided, the value will be read from standard input.
rmomapkey [ --omap-key-file file ] name key
Remove key from the object map of object name.
getomapheader name
Dump the hexadecimal value of the object map header of object name.
setomapheader name value
Set the value of the object map header of object name.
export filename
Serialize pool contents to a file or standard output.n"
import [--dry-run] [--no-overwrite] < filename | - >
Load pool contents from a file or standard input
EXAMPLES
To view cluster utilization:
rados df
To get a list object in pool foo sent to stdout:
rados -p foo ls -
To get a list of objects in PG 0.6:
rados --pgid 0.6 ls
To write an object:
rados -p foo put myobject blah.txt
To create a snapshot:
rados -p foo mksnap mysnap
To delete the object:
rados -p foo rm myobject
To read a previously snapshotted version of an object:
rados -p foo -s mysnap get myobject blah.txt.old
To list inconsistent objects in PG 0.6:
rados list-inconsistent-obj 0.6 --format=json-pretty
AVAILABILITY
rados is part of Ceph, a massively scalable, open-source, distributed storage system. Please refer to the
Ceph documentation at https://docs.ceph.com for more information.
SEE ALSO
ceph(8)
COPYRIGHT
2010-2025, Inktank Storage, Inc. and contributors. Licensed under Creative Commons Attribution Share
Alike 3.0 (CC-BY-SA-3.0)
dev Jun 24, 2025 RADOS(8)