Quick view of RAID sync, rebuild, and degraded state.
Section: RAID and Encryption
Show active MD arrays
bash
bash
cat /proc/mdstatExplanation
Quick view of RAID sync, rebuild, and degraded state.
Learn the surrounding workflow
Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.
Related commands
Same sheet · prioritizing RAID and Encryption
Examine RAID metadata on members
Inspect md superblock metadata directly on a member device.
Stop an array
Stop a software RAID device before disassembly or recovery work.
Assemble an existing array
Discover and assemble arrays based on metadata or config.
Generate mdadm.conf array entries
Persist discovered arrays into mdadm configuration.