mdadm:tldr:69d5a
mdadm: Mark disk as failed.
$ sudo mdadm --fail ${-dev-md0} ${-dev-sdXN}
try on your machine
This command is used to fail a specific device from a RAID array. Here's how it breaks down:
sudo: This command is used to execute the subsequent command as the superuser or administrator. It provides elevated privileges to perform system-related tasks.mdadm: This is the Linux utility used for managing and monitoring software RAID arrays.--fail: This option specifies that we want to mark a device as failed within the RAID array.${-dev-md0}: This parameter refers to the device name or identifier of the RAID array. The${-dev-md0}syntax is typically replaced with the actual device name, for example,/dev/md0.${-dev-sdXN}: This parameter refers to the specific device that will be marked as failed. The${-dev-sdXN}syntax is typically replaced with the actual device name or identifier, for instance,/dev/sdXN.
In summary, the command is used to fail a device (${-dev-sdXN}) from a specific RAID array (${-dev-md0}) by marking it as failed.
This explanation was created by an AI. In most cases those are correct. But please always be careful and
never run a command you are not sure if it is safe.