How to resize /dev/md1

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http://serverfault.com – I notice today that my /dev/md1/ is almost full: Filesystem Size Used Avail Use% Mounted on /dev/md1 10G 8.7G 798M 92% / tmpfs 7.8G 0 7.8G 0% /lib/init/rw udev 10M 172K 9.9M 2% /dev tmpfs 7.8G 4.0K 7.8G 1% /dev/shm /dev/md2 921G 15G 861G 2% /home And I've no idea how to extend the size of /dev/md1 Here is the result of the mdadm --detail /dev/md1 command dev/md1: Version : 0.90 Creation Time : Wed Jun 20 14:16:31 2012 Raid Level : raid1 Array Size : 10485696 (10. (HowTos)