Filesystem Size Used Avail Use% Mounted on
50G 1.2G 46G 3% /
tmpfs 7.8G 0 7.8G 0% /dev/shm
/dev/sda1 485M 52M 408M 12% /boot
94G 188M 89G 1% /home
I want to resize /dev/mapper/vg_12-lv_home
lvresize -r -L 100M /dev/mapper/vg_12-lv_home
The above resizes it to 100 megabytes, you could specify G for gigabytes too, of course you can't make it too small if you have used more space than the size you specify, it will throw an error.
resize2fs 1.41.12 (17-May-2010)
resize2fs: New size smaller than minimum (92233)
fsadm: Resize ext4 failed
fsadm failed: 1
Filesystem resize failed.
*Changing it to 1G made it work.
Now I want to resize my root to use the maximum possible space:
lvresize -r -l +100%FREE /dev/mapper/vg_12-lv_root
Notice instead of using -L which specifies a specific size, I've used "-l +100%FREE", it makes vg_12-lv_root use 100% of the available free space on the physical volume I freed by resizing the lv_home above
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