ndctl-list - Man Page

ndctl list [<options>]

Walk all the nvdimm buses in the system and list all attached devices along with some of their major attributes.

Options can be specified to limit the output to devices of a certain class.  Where the classes are buses, dimms, regions, and namespaces.  By default, ndctl list with no options is equivalent to:

ndctl list --namespaces --bus=all --region=all

# 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"
    }
  ]
}

-r,  --region=

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.

-b,  --bus=

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.

-d,  --dimm=

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:

# ndctl list --dimm=nmem0 --namespaces

-n,  --namespace=

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

-m,  --mode=

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

-U,  --numa-node=

Filter listing by numa node

-B,  --buses

Include bus info in the listing

-D,  --dimms

Include dimm info in the listing

{
  "dev":"nmem0",
  "id":"cdab-0a-07e0-ffffffff",
  "handle":0,
  "phys_id":0,
  "security:":"disabled"
}

-H,  --health

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"
  }
}

-F,  --firmware

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

# 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
        }
      },
...
]

-X,  --device-dax

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
      }
    ]
  }
}

-R,  --regions

Include region info in the listing

-N,  --namespaces

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

-i,  --idle

Include idle (not enabled) devices in the listing

-c,  --configured

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

-C,  --capabilities

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

-M,  --media-errors

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
    }
  ]
}

-v,  --verbose

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.

• -v In addition to the enabled namespaces default output, show the numa_node, raw_uuid, and bad block media errors.
• -vv Everything -v provides, plus automatically enable --dimms, --buses, and --regions.
• -vvv Everything -vv provides, plus --health, --capabilities, --idle, and --firmware. :: The verbosity can also be scoped by the object type. For example to just list regions with capabilities and media error info.

# 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"
}

-u,  --human

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.

# ndctl list --region=7
{
  "dev":"region7",
  "size":67108864,
  "available_size":67108864,
  "type":"pmem",
  "iset_id":-6382611090938810793,
  "badblock_count":8
}

# 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
}

NDCTL_LIST_LINT

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:

• Fix "ndctl list -Rv" to only show region objects and not include namespace objects. ::

Copyright © 2016 - 2022, Intel Corporation. License GPLv2: GNU GPL version 2 http://gnu.org/licenses/gpl.html. This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

ndctl-create-namespace(1)

cxl-list(1), daxctl(1), ndctl(1), ndctl-clear-errors(1), ndctl-inject-error(1), ndctl-inject-smart(1), ndctl-monitor(1).