.ft C
# ndctl list --buses --namespaces
{


  "provider":"nfit_test.1",


  "dev":"ndbus2",


  "namespaces":[


    {


      "dev":"namespace9.0",


      "mode":"raw",


      "size":33554432,


      "blockdev":"pmem9"


    }


  ]
}
{


  "provider":"nfit_test.0",


  "dev":"ndbus1"
}
{


  "provider":"e820",


  "dev":"ndbus0",


  "namespaces":[


    {


      "dev":"namespace0.0",


      "mode":"fsdax",


      "size":8589934592,


      "blockdev":"pmem0"


    }


  ]
}
.ft

A regionX device name, or a region id number. Restrict the operation to the specified region(s). The keyword all can be specified to indicate the lack of any restriction, however this is the same as not supplying a --region option at all.

A bus id number, or a provider string (e.g. "ACPI.NFIT"). Restrict the operation to the specified bus(es). The keyword all can be specified to indicate the lack of any restriction, however this is the same as not supplying a --bus option at all.

An nmemX device name, or dimm id number. The dimm id number here is X in nmemX. Filter listing by devices that reference the given dimm. For example to see all namespaces comprised of storage capacity on nmem0:

.ft C
# ndctl list --dimm=nmem0 --namespaces
.ft

An namespaceX.Y device name, or namespace region plus id tuple X.Y. Limit the namespace list to the single identified device if present.

Filter listing by the mode (raw, fsdax, sector or devdax) of the namespace(s).

Filter listing by numa node

Include bus info in the listing

Include dimm info in the listing

{


  "dev":"nmem0",


  "id":"cdab-0a-07e0-ffffffff",


  "handle":0,


  "phys_id":0,


  "security:":"disabled"
}

Include dimm health info in the listing. For example:

{


  "dev":"nmem0",


  "health":{


    "health_state":"non-critical",


    "temperature_celsius":23,


    "spares_percentage":75,


    "alarm_temperature":true,


    "alarm_spares":true,


    "temperature_threshold":40,


    "spares_threshold":5,


    "life_used_percentage":5,


    "shutdown_state":"clean"


  }
}

Include firmware info in the listing, including the state and capability of runtime firmware activation:

.ft C
# ndctl list -BDF
[


  {


    "provider":"nfit_test.0",


    "dev":"ndbus2",


    "scrub_state":"idle",


    "firmware":{


      "activate_method":"suspend",


      "activate_state":"idle"


    },


    "dimms":[


      {


        "dev":"nmem1",


        "id":"cdab-0a-07e0-ffffffff",


        "handle":0,


        "phys_id":0,


        "security":"disabled",


        "firmware":{


          "current_version":0,


          "can_update":true


        }


      },
...
]
.ft

Include device-dax ("daxregion") details when a namespace is in "devdax" mode.

{


  "dev":"namespace0.0",


  "mode":"devdax",


  "size":4225761280,


  "uuid":"18ae1bbb-bb62-4efc-86df-4a5caacb5dcc",


  "daxregion":{


    "id":0,


    "size":4225761280,


    "align":2097152,


    "devices":[


      {


        "chardev":"dax0.0",


        "size":4225761280


      }


    ]


  }
}

Include region info in the listing

Include namespace info in the listing. Namespace info is listed by default if no other options are specified to the command.

Include idle (not enabled) devices in the listing

Include configured devices (non-zero sized namespaces) regardless of whether they are enabled, or not. Other devices besides namespaces are always considered "configured".

Include region capabilities in the listing, i.e. supported namespace modes and variable properties like sector sizes and alignments.

Include media errors (badblocks) in the listing. Note that the badblock_count property is included in the listing by default when the count is non-zero, otherwise it is hidden. Also, if the namespace is in sector mode the badblocks listing is not included and badblock_count property may include blocks that are located in metadata, or unused capacity in the namespace. Convert a sector namespace into raw mode to list precise badblocks offsets.

{


  "dev":"namespace7.0",


  "mode":"raw",


  "size":33554432,


  "blockdev":"pmem7",


  "badblock_count":17,


  "badblocks":[


    {


      "offset":4,


      "length":1


    },


    {


      "offset":32768,


      "length":8


    },


    {


      "offset":65528,


      "length":8


    }


  ]
}

Increase verbosity of the output. This can be specified multiple times to be even more verbose on the informational and miscellaneous output, and can be used to override omitted flags for showing specific information.

.ft C
# ndctl list -Ru -vvv -r 0
{


  "dev":"region0",


  "size":"4.00 GiB (4.29 GB)",


  "available_size":0,


  "max_available_extent":0,


  "type":"pmem",


  "numa_node":0,


  "target_node":2,


  "capabilities":[


    {


      "mode":"sector",


      "sector_sizes":[


        512,


        520,


        528,


        4096,


        4104,


        4160,


        4224


      ]


    },


    {


      "mode":"fsdax",


      "alignments":[


        4096,


        2097152,


        1073741824


      ]


    },


    {


      "mode":"devdax",


      "alignments":[


        4096,


        2097152,


        1073741824


      ]


    }


  ],


  "persistence_domain":"unknown"
}
.ft

Format numbers representing storage sizes, or offsets as human readable strings with units instead of the default machine-friendly raw-integer data. Convert other numeric fields into hexadecimal strings.

.ft C
# ndctl list --region=7
{


  "dev":"region7",


  "size":67108864,


  "available_size":67108864,


  "type":"pmem",


  "iset_id":-6382611090938810793,


  "badblock_count":8
}
.ft

.ft C
# ndctl list --human --region=7
{


  "dev":"region7",


  "size":"64.00 MiB (67.11 MB)",


  "available_size":"64.00 MiB (67.11 MB)",


  "type":"pmem",


  "iset_id":"0xa76c6907811fae57",


  "badblock_count":8
}
.ft

A bug in the "ndctl list" output needs to be fixed with care for other tooling that may have developed a dependency on the buggy behavior. The NDCTL_LIST_LINT variable is an opt-in to apply fixes, and not regress previously shipped behavior by default. This environment variable applies the following fixups: