NAME

       ndctl-check-namespace - check namespace metadata consistency

SYNOPSIS

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

DESCRIPTION

       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.

EXAMPLES

       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

OPTIONS

       -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. 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.

COPYRIGHT

       Copyright (c) 2016 - 2019, 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

       ndctl-disable-namespace(1), ndctl-enable-namespace(1), UEFI NVDIMM Label Protocol
       <http://www.uefi.org/sites/default/files/resources/UEFI_Spec_2_7.pdf>