CentOS 7.x madam basic operations

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General software RAID status

At any time to see software RAID status eg rebuilding or device failure use:

cat /proc/mdstat

Detect array with mdadm.conf during rescue boot after a component raid device has failed

Auto-detect array created arrays during rescue mode without mdadm.conf file. To auto-detect (assemble) array during rescue mode after a failed device is removed use:

  mdadm --assemble --scan

Then if the failed device is still listed it can be removed using:

  mdadm --remove /dev/md<n> /dev/sd<n>

If the device is not in failed state, it can be set to failed state using:

  mdadm --fail /dev/md<n> /dev/sd<n>

See details of raid device

At any time see detail of raid device using:

  mdadm --detail /dev/md<n>

Similarly a component drive of raid can be examined using:

  mdadm --examine /dev/sd<n>

Refer:

• https://raid.wiki.kernel.org/index.php/RAID_setup

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