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===Adding partitions===
===Adding partitions===
{{Note box|The process can take many hours or even days. There is a critical section at start, which cannot be backed up. To allow recovery after unexpected power failure, an additional option <code>--backup-file=</code> can be specified. Make sure this file is on a different disk or it defeats the purpose.
mdadm --grow --raid-devices=5 --backup-file=/root/grow_md1.bak /dev/md1}}
Now we need to add the first partition /dev/sde1 to /dev/md1
Now we need to add the first partition /dev/sde1 to /dev/md1
