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Show details of a software RAID array

harmless rootSystem and hardwaredebian, ubuntu
Adjust the values, the command updates live
root@server
mdadm --detail /dev/md0

More detailed than /proc/mdstat: State shows, for example, clean or degraded, followed by the counts of active, failed and spare disks. The table at the end maps each member to a device such as /dev/sdb1; failed disks are marked as faulty or removed.

Note: smartctl -i on the respective device returns the serial number of the failed disk for the replacement in the data center.

Also searched as

  • which disk failed in the raid
  • show mdadm details
  • check raid state in detail

Related one-liners

All in System and hardware

Show software RAID (mdadm) status

$cat /proc/mdstat
harmlessSystem and hardware

Check the SMART health status of a disk

#smartctl -H /dev/sda
harmlessSystem and hardware

Show SMART attributes of a disk

#smartctl -A /dev/sda
harmlessSystem and hardware

Start a SMART short self-test on a disk

#smartctl -t short /dev/sda
harmlessSystem and hardware

List disks and partitions

$lsblk -o NAME,SIZE,TYPE,FSTYPE,MOUNTPOINT,UUID
harmlessFilesystem

Change swappiness at runtime

#sysctl vm.swappiness=10
cautionSystem and hardware

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