mdadm -Ds > /etc/mdadm.conf
mdadm -Es > /etc/mdadm.conf
mdadm -Ss（停止）
mdadm -As（运行）
mdadm -C /dev/md0 -l5 -n5 /dev/sd[bcdef]1
resize RAID:
1. RAID offline
2. resize disk A partation
3. RAID online
4. rsync
5, RAID offline
6. resize disk B partation
7. RAID online
8. rsync
9. resize RAID with "-G -z max"
10. resize filesystem
11. mount RAID filesystem and check
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