{{tip box|msg=You need to keep --raid-devices='''4''' if you want to have an array of 4 drives+1spare, However if you do not want a spare drive, you should set --raid-devices='''5'''}}
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{{tip box|msg=You need to keep --raid-devices='''4''' if you want to have an array of 4 drives+1spare, However if you do not want a spare drive, you should set --raid-devices='''5'''. This command can be used to grow an array of raid on the spare drive, just say to mdadm that you want to use all disks connected to the computer.}}
{{Warning box|During the raid growing step you DO not shutdown your computer, or experienced an electrical failure, these issues can let your computer in a badly status and you can loose your data}}
{{Warning box|During the raid growing step you DO not shutdown your computer, or experienced an electrical failure, these issues can let your computer in a badly status and you can loose your data}}