Resize underlying partitions in mdadm RAID1

Posted by kyork on Super User See other posts from Super User or by kyork
Published on 2012-09-02T01:37:11Z Indexed on 2012/09/02 3:40 UTC
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ubuntu

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ext3

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mdadm

I have a home built NAS, and I need to slightly reconfigure some of my drive usage.

I have an mdadm RAID1 composed of two 3TB drives. Each drive has one ext3 partition that uses the entire drive. I need to shrink the ext3 partition on both drives, and add a second 8GB or so ext3 partition to one, and swap partition of equal size to the other. I think I have the steps figured out, but wanted some confirmation.

Resize the mdadm RAID resize2fs /dev/md0 [size] where size is a little larger than the currently used space on the drive
Remove one of the drives from the RAID mdadm /dev/md0 --fail /dev/sda1
Resize the removed drive with parted
Add the new partition to the drive with parted
Restore the drive to the RAID mdadm -a /dev/md0 /dev/sda1
Repeat 2-5 for the other device
Resize the RAID to use the full partition mdadm --grow /dev/md0 -z max

Is there anything I've missed, or haven't considered?

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