I wanna use Raspberry Pi as File server, Media server, Cache server and etc. So I separated /var, /opt, /home directories to LVM volumes as following steps.
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root@raspberrypi:/$ df -h Filesystem Size Used Avail Use% Mounted on /dev/root 15G 1.6G 12G 12% / /dev/mmcblk0p1 44M 23M 22M 51% /boot /dev/mapper/VolGroup00-lvolvar 20G 592M 19G 4% /var /dev/mapper/VolGroup00-lvolopt 20G 84M 19G 1% /opt /dev/mapper/VolGroup00-lvolhome 49G 53M 47G 1% /home /dev/mapper/VolGroup00-lvoldata 1007G 72M 961G 1% /data |
1.Create LVM volumes by these steps.
2.Mount LVM volumes from Pi and move data.
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root@raspberrypi:/$ apt-get install lvm2 root@raspberrypi:/$ vgscan # find volume groups root@raspberrypi:/$ vgchange -ay # activate logical volumes root@raspberrypi:/$ mount /dev/VolGroup00/lvolvar /mnt root@raspberrypi:/$ swapoff -a # to move swapfile /var/swap, swapoff temporarily root@raspberrypi:/$ mv /var/* /mnt/ root@raspberrypi:/$ umount /mnt root@raspberrypi:/$ mount /dev/VolGroup00/lvolvar /var root@raspberrypi:/$ swapon -a # move data from other directories as well |
3.Update /etc/fstab
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/dev/mapper/VolGroup00-lvolvar /var ext4 defaults 0 1 /dev/mapper/VolGroup00-lvolopt /opt ext4 defaults 0 1 /dev/mapper/VolGroup00-lvolhome /home ext4 defaults 0 1 /dev/mapper/VolGroup00-lvoldata /data ext4 defaults 0 1 |
4.Update initramfs for mount LVM on booting
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root@raspberrypi:/$ update-initramfs -u # update existing initramfs |
Without step 4, init can’t find LVM volumes on booting and some init processes fail. Besides, if /usr is also separated and failed to mount then kernel panic occurred and it never boot.