Binary package “mdadm” in ubuntu xenial

tool to administer Linux MD arrays (software RAID)

 The mdadm utility can be used to create, manage, and monitor MD
 (multi-disk) arrays for software RAID or multipath I/O.
 .
 This package automatically configures mdadm to assemble arrays during the
 system startup process. If not needed, this functionality can be disabled.

Published versions