dmraid software package provides Device-Mapper Software RAID support tool, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install dmraid
dmraid is installed in your system.
Make ensure the dmraid package were installed using the commands given below,
$ sudo dpkg-query -l | grep dmraid *
You will get with dmraid package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Administration Utilities |
| Package | dmraid |
| Version | 1.0.0.rc16-5 |
| Description | Device-Mapper Software RAID support tool |
| Sub Section | admin |