> 1. Bring the system down.
> 2. Install the spare drive
Coward :-)
> 3. Boot up and edit the /etc/raidtab to include the spare drive
That is not needed, but is good practice.
[[ What I do is to dump the PSB info to /etc/raidtab every night ]]
> 4. fdisk the drive to be identical to the mirror'd drives
Note that the *PARTITION* has to be the same size (to the nearest 64Kb
boundry) and that there is no reason for the whole *DISK* to be the same.
If you are cloning disks, I would recommend sfdisk rather than fdisk !
> 5. raidhotadd the drive
Yup -- and you're flying !
> Is this correct
Yes.
> and will the drive then be added automatically should a drive fail
Yes.
> and the system is rebooted ?.
No need to reboot -- it kicks in as soon as the disk fails.