Documentation for ndctl and daxctl


ndctl-check-namespace - check namespace metadata consistency


ndctl check-namespace <namespace> [<options>]


A namespace in the sector mode will have metadata on it to describe the kernel BTT (Block Translation Table). The check-namespace command can be used to check the consistency of this metadata, and optionally, also attempt to repair it, if it has enough information to do so.

The namespace being checked has to be disabled before initiating a check on it as a precautionary measure. The –force option can override this.


Check a namespace (only report errors)

ndctl disable-namespace namespace0.0
ndctl check-namespace namespace0.0

Check a namespace, and perform repairs if possible

ndctl disable-namespace namespace0.0
ndctl check-namespace --repair namespace0.0


-R; --repair
Perform metadata repairs if possible. Without this option, the raw namespace contents will not be touched.

-L; --rewrite-log
Regenerate the BTT log and write it to media. This can be used to convert from the old (pre 4.15) padding format that was incompatible with other BTT implementations to the updated format. This requires the –repair option to be provided.

WARNING: Do not interrupt this operation as it can potentially cause
unrecoverable metadata corruption. It is highly recommended to create
a backup of the raw namespace before attempting this.

-f; --force
Unless this option is specified, a check-namespace operation will fail if the namespace is presently active. Specifying –force causes the namespace to be disabled before checking.

-v; --verbose
Emit debug messages for the namespace check process.

-r; --region=
A ‘regionX’ device name, or a region id number. The keyword ‘all’ can be specified to carry out the operation on every region in the system, optionally filtered by bus id (see –bus= option).

-b; --bus=
Enforce that the operation only be carried on devices that are attached to the given bus. Where bus can be a provider name or a bus id number.


Copyright (c) 2016 - 2018, Intel Corporation. License GPLv2: GNU GPL version 2 This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.


ndctl-disable-namespace, ndctl-enable-namespace, UEFI NVDIMM Label Protocol