Name

raidhotadd

Synopsis

raidhotadd mdevice memberdevice

raidhotadd inserts a new disk into a running array. After a failed drive has been removed using raidhotadd, you can use this command to add a replacement drive.

When a new drive is introduced into an active array, reconstruction commences. Therefore, it’s a wise idea to add a new drive when you are certain that the recovery process will not impact users. There may, of course, be times when waiting is not an option. You can also fine-tune the speed at which recovery occurs in order to minimize the impact on the system. Refer to the /proc/sys/dev/raid section, earlier in this chapter, for details on how to throttle the recovery process.

Options

raidhotadd has no command-line options. It takes an md device and a member disk as its only arguments.

Example usage

The following adds /dev/sdc1 to the array /dev/md0:

# raidhotadd /dev/md0 /dev/sdc1

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