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August 18, 2022 18:59
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Extend Ubuntu raid partition "/" by deleting "/home" partition using mdadm and parted
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| # Based on | |
| # https://docs.hetzner.com/robot/dedicated-server/raid/exchanging-hard-disks-in-a-software-raid/ | |
| # https://documentation.suse.com/sles/12-SP4/html/SLES-all/cha-raid-resize.html | |
| # https://redhatlinux.guru/2016/08/24/how-to-remove-mdadm-raid-devices/ | |
| # https://help.ubuntu.com/community/Partitioning/Home/Moving | |
| # https://askubuntu.com/questions/116351/increase-partition-size-on-which-ubuntu-is-installed | |
| lsblk | |
| --------------------------------------------- | |
| NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS | |
| sda 8:0 0 3.6T 0 disk | |
| ├─sda1 8:1 0 32G 0 part | |
| │ └─md0 9:0 0 32G 0 raid1 [SWAP] | |
| ├─sda2 8:2 0 1G 0 part | |
| │ └─md1 9:1 0 1022M 0 raid1 /boot | |
| ├─sda3 8:3 0 2T 0 part | |
| │ └─md2 9:2 0 2T 0 raid1 / <------- need to be extended my max | |
| ├─sda4 8:4 0 1.6T 0 part | |
| │ └─md3 9:3 0 1.6T 0 raid1 /home <------- need to be deleted | |
| └─sda5 8:5 0 1M 0 part | |
| sdb 8:16 0 3.6T 0 disk | |
| ├─sdb1 8:17 0 32G 0 part | |
| │ └─md0 9:0 0 32G 0 raid1 [SWAP] | |
| ├─sdb2 8:18 0 1G 0 part | |
| │ └─md1 9:1 0 1022M 0 raid1 /boot | |
| ├─sdb3 8:19 0 2T 0 part | |
| │ └─md2 9:2 0 2T 0 raid1 / <------- need to be extended my max | |
| ├─sdb4 8:20 0 1.6T 0 part | |
| │ └─md3 9:3 0 1.6T 0 raid1 /home <------- need to be deleted | |
| └─sdb5 8:21 0 1M 0 part | |
| cat /proc/mdstat | |
| umount /home # or umount /dev/md3 | |
| mdadm --stop /dev/md3 | |
| cat /proc/mdstat | |
| mdadm --remove /dev/md3 # if error opening md1: No such file or directory | |
| mdadm --zero-superblock /dev/sda4 /dev/sdb4 | |
| # edit /etc/fstab to remove md3 mount | |
| ## | |
| ## md3 with /home deleted, go to extemd md2 | |
| ## | |
| mdadm /dev/md2 --fail /dev/sda3 --remove /dev/sda3 | |
| lsblk | |
| NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS | |
| sda 8:0 0 3.6T 0 disk | |
| ├─sda1 8:1 0 32G 0 part | |
| │ └─md0 9:0 0 32G 0 raid1 [SWAP] | |
| ├─sda2 8:2 0 1G 0 part | |
| │ └─md1 9:1 0 1022M 0 raid1 /boot | |
| ├─sda3 8:3 0 2T 0 part | |
| ├─sda4 8:4 0 1.6T 0 part | |
| └─sda5 8:5 0 1M 0 part | |
| sdb 8:16 0 3.6T 0 disk | |
| ├─sdb1 8:17 0 32G 0 part | |
| │ └─md0 9:0 0 32G 0 raid1 [SWAP] | |
| ├─sdb2 8:18 0 1G 0 part | |
| │ └─md1 9:1 0 1022M 0 raid1 /boot | |
| ├─sdb3 8:19 0 2T 0 part | |
| │ └─md2 9:2 0 2T 0 raid1 / | |
| ├─sdb4 8:20 0 1.6T 0 part | |
| └─sdb5 8:21 0 1M 0 part | |
| parted /dev/sda | |
| rm 4 | |
| print free | |
| Number Start End Size File system Name Flags | |
| 17.4kB 1049kB 1031kB Free Space | |
| 5 1049kB 2097kB 1049kB bios_grub | |
| 1 2097kB 34.4GB 34.4GB raid | |
| 2 34.4GB 35.4GB 1074MB raid | |
| 3 35.4GB 2198GB 2163GB raid | |
| 2198GB 4001GB 1803GB Free Space | |
| resizepart 3 | |
| 4001GB | |
| print free | |
| Number Start End Size File system Name Flags | |
| 17.4kB 1049kB 1031kB Free Space | |
| 5 1049kB 2097kB 1049kB bios_grub | |
| 1 2097kB 34.4GB 34.4GB raid | |
| 2 34.4GB 35.4GB 1074MB raid | |
| 3 35.4GB 4001GB 3965GB raid | |
| mdadm -a /dev/md2 /dev/sda3 | |
| mdadm /dev/md2 --fail /dev/sdb3 --remove /dev/sdb3 | |
| parted /dev/sdb | |
| (parted) rm 4 | |
| (parted) resizepart 3 | |
| mdadm -a /dev/md2 /dev/sdb3 | |
| mdadm -D /dev/md2 | grep -e "Array Size" -e "Dev Size" | |
| mdadm --grow /dev/md2 -z max | |
| mdadm -D /dev/md2 | grep -e "Array Size" -e "Dev Size" | |
| NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS | |
| sda 8:0 0 3.6T 0 disk | |
| ├─sda1 8:1 0 32G 0 part | |
| │ └─md0 9:0 0 32G 0 raid1 [SWAP] | |
| ├─sda2 8:2 0 1G 0 part | |
| │ └─md1 9:1 0 1022M 0 raid1 /boot | |
| ├─sda3 8:3 0 3.6T 0 part | |
| │ └─md2 9:2 0 3.6T 0 raid1 / | |
| └─sda5 8:5 0 1M 0 part | |
| sdb 8:16 0 3.6T 0 disk | |
| ├─sdb1 8:17 0 32G 0 part | |
| │ └─md0 9:0 0 32G 0 raid1 [SWAP] | |
| ├─sdb2 8:18 0 1G 0 part | |
| │ └─md1 9:1 0 1022M 0 raid1 /boot | |
| ├─sdb3 8:19 0 3.6T 0 part | |
| │ └─md2 9:2 0 3.6T 0 raid1 / | |
| └─sdb5 8:21 0 1M 0 part | |
| df -h | |
| Filesystem Size Used Avail Use% Mounted on | |
| tmpfs 6.3G 1.1M 6.3G 1% /run | |
| /dev/md2 2.0T 2.0G 1.9T 1% / | |
| tmpfs 32G 0 32G 0% /dev/shm | |
| tmpfs 5.0M 0 5.0M 0% /run/lock | |
| /dev/md1 989M 129M 809M 14% /boot | |
| tmpfs 6.3G 0 6.3G 0% /run/user/0 | |
| resize2fs /dev/md2 | |
| tune2fs -m 2 /dev/md2 | |
| df -h | |
| Filesystem Size Used Avail Use% Mounted on | |
| tmpfs 6.3G 1.1M 6.3G 1% /run | |
| /dev/md2 3.6T 2.4G 3.5T 1% / | |
| tmpfs 32G 0 32G 0% /dev/shm | |
| tmpfs 5.0M 0 5.0M 0% /run/lock | |
| /dev/md1 989M 129M 809M 14% /boot | |
| tmpfs 6.3G 0 6.3G 0% /run/user/0 |
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