---
name: "ndctl-check-labels"
section: "1"
platform: "linux"
package: "ndctl"
version: "85-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/ndctl-check-labels"
---

# ndctl-check-labels(1)

determine if the given dimms have a valid namespace index block

## NAME

ndctl-check-labels - determine if the given dimms have a valid namespace index block

## SYNOPSIS

```
ndctl check-labels <nmem0> [<nmem1>..<nmemN>] [<options>]
```

## DESCRIPTION

The namespace label area is a small persistent partition of capacity available on some NVDIMM devices.  The label area is used to provision one, or more, namespaces from regions. In addition to checking if a label area has a valid index block, running this command in verbose mode reports the reason the index block is deemed invalid.

## OPTIONS

\<memory device(s)\>

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

\-s, --size=

Limit the operation to the given number of bytes. A size of 0 indicates to operate over the entire label capacity.

\-O, --offset=

Begin the operation at the given offset into the label area.

\-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.

- \-v

  Turn on verbose debug messages in the library (if ndctl was built with logging and debug enabled).

## COPYRIGHT

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.

## SEE ALSO

*UEFI NVDIMM Label Protocol* \<http://www.uefi.org/sites/default/files/resources/UEFI\_Spec\_2\_7.pdf\>