NAME

       daxio - Perform I/O on Device DAX devices or zero a Device DAX device

SYNOPSIS

              $ daxio [<options>]

DESCRIPTION

       The daxio utility performs I/O on Device DAX devices or zero a Device DAX device.  Since the standard I/O
       APIs (read/write) cannot be used with Device DAX, data transfer is performed on a  memory-mapped  device.
       The  daxio may be used to dump Device DAX data to a file, restore data from a backup copy, move/copy data
       to another device or to erase data from a device.

       There must be at least one Device DAX device involved either as the input or output.  If input or  output
       is not specified, it will default to stdin or stdout respectively.

       No  length  specified  will  default  to input file/device length or to the output file/device length, if
       input is a special char file or stdin.

       For a Device DAX device, daxio will attempt to clear  bad  blocks  within  the  range  of  writes  before
       performing the I/O (it can be turned off using the `–clear-bad-blocks=no' option).

OPTIONS

       -i, --input Input device or file to read from.

       -o, --output Output device or file to write to.

       -z, --zero  Zero  the  output  device  for len size, or the entire device if no length was provided.  The
       output device must be a Device DAX device.

       -b, --clear-bad-blocks=<yes|no> Clear bad blocks within the range of writes  before  performing  the  I/O
       (default: yes).

       -l, --len  The  length in bytes to perform the I/O.  To make passing in size easier for kibi, mebi, gibi,
       and tebi bytes, len may include unit suffix.  The len format must be compliant with the format  specified
       in  IEC  80000-13,  IEEE  1541  or  the  Metric Interchange Format.  These standards accept SI units with
       obligatory B - kB, MB, GB, ...  (multiplier by 1000) suffixes, and IEC units with optional  “iB”  -  KiB,
       MiB, GiB, ..., K, M, G, ... (multiplier by 1024) suffixes.

       -s, --seek  The  number of bytes to skip over on the output before performing a write.  The same suffixes
       are accepted as for len.

       -k, --skip The number of bytes to skip over on the input before performing a read.  The same suffixes are
       accepted as for len.

       -V, --version

       Prints the version of daxio.

       -h, --help

       Prints synopsis and list of options.

EXAMPLE

              # daxio --zero /dev/dax1.0

              # daxio --input=/dev/dax1.0 --output=/home/myfile --len=2M --seek=4096

              # cat /dev/zero | daxio --output=/dev/dax1.0

              # daxio --input=/dev/zero --output=/dev/dax1.0 --skip=4096

SEE ALSO

       daxctl(1), ndctl(1) and <https://pmem.io>