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Resizing a RAID 1 mirror on Debian with mdadm, fdisk, and resize2fs
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| # Logical Structure: | |
| # +-----------------------------------+ | |
| # | +--------------------------+ | | |
| # | | +------------+ | | | |
| # | RAID | Partition | Filesystem | | | | |
| # | | +------------+ | | | |
| # | +--------------------------+ | | |
| # +-----------------------------------+ | |
| # unmount RAID | |
| umount /media/All | |
| # remove the drive to be enlarged or swapped out | |
| # be sure to specify only the partition device, not the entire drive device | |
| mdadm /dev/md1 --fail /dev/sdb1 --remove /dev/sdb1 | |
| # delete partition and recreate larger one on top of existing data. data will survive. | |
| # steps: https://unix.stackexchange.com/posts/320454/revisions | |
| fdisk /dev/sdb | |
| # partitions are now the same size. enlarge the RAID config | |
| mdadm --grow /dev/md1 -z max | |
| # check the RAID for errors | |
| e2fsck -f /dev/md1 -y | |
| # enlarge the RAID filesystem | |
| resize2fs /dev/md1 | |
| # mount the RAID | |
| mount -a |
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