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# Reducing the root LV
## Contents
- [Overview](#overview)
- [Procedure](#procedure)
- [Without lvresize -r flag](#without-lvresize--r-flag)
- [With lvresize -r flag](#with-lvresize--r-flag)
## Overview
Reducing the root logical volume requires booting into a rescue environment that has the LVM utilities.
> Some rescue images have a version of the LVM utilities that were released missing a critical shim needed to resize filesystems using the `-r` flag to `lvresize`. It may or may not be necessary to resize the filesystem as a separate step, both are outlined.
## Procedure
Given this current configuration of a 250G boot volume:
| **Mount** | **Size** | **VG / LV** |
| --------- | --------- | ---------------- |
| /boot | 250M | n/a |
| /tmp | 2G | vglocal / lvtmp |
| swap | 2G | vglocal / lvswap |
| / | remainder | vglocal / lvroot |
We'll reduce the root (/) volume and grow swap and /tmp to end up with:
| **Mount** | **Size** | **VG / LV** |
| --------- | --------- | ---------------- |
| /boot | 250M | n/a |
| /tmp | 4G | vglocal / lvtmp |
| swap | 32G | vglocal / lvswap |
| / | remainder | vglocal / lvroot |
### Without lvresize -r flag
```
##
## DO NOT MOUNT ANY FILESYSTEMS DURING RESCUE BOOT
##
# activate all LVM
lvm vgchange -a y
# fsck the filesystems; it's normal to get a message about a time error that needs fixed
fsck -fC /dev/vglocal/lvroot
fsck -fC /dev/vglocal/lvtmp
# shrink the ext3/4 root far below what we need
resize2fs -p /dev/vglocal/lvroot 200G
# reduce the root LV a bit above what we just resized (+5GB)
lvm lvresize /dev/vglocal/lvroot --size 205G
# increase swap and tmp LVs
lvm lvresize /dev/vglocal/lvswap --size 32G
lvm lvresize /dev/vglocal/lvtmp --size 4G
# re-grow the root LV back to max space
lvm lvresize -l +100%FREE /dev/vglocal/lvroot
# re-grow the / and /tmp ext3/4 to fill the increased LVs
resize2fs -p /dev/vglocal/lvroot
resize2fs -p /dev/vglocal/lvtmp
# fsck the filesystems again
fsck -fC /dev/vglocal/lvroot
fsck -fC /dev/vglocal/lvtmp
# rescue image 'mkswap' is sometimes not able to see a large swap
reboot
# finally, make a new swap signature that sees the whole LV
swapoff /dev/vglocal/lvswap
mkswap /dev/vglocal/lvswap
swapon /dev/vglocal/lvswap
```
### With lvresize -r flag
```
##
## DO NOT MOUNT ANY FILESYSTEMS DURING RESCUE BOOT
##
# activate all LVM
lvm vgchange -a y
# fsck the filesystems; it's normal to get a message about a time error that needs fixed
fsck -fC /dev/vglocal/lvroot
fsck -fC /dev/vglocal/lvtmp
# reduce the size of LV root a tad more than we need
lvm lvresize -r /dev/vglocal/lvroot --size 200G
# increase swap and tmp LVs
lvm lvresize /dev/vglocal/lvswap --size 32G
lvm lvresize /dev/vglocal/lvtmp --size 4G
# re-grow the root LV back to max space
lvm lvresize -r -l +100%FREE /dev/vglocal/lvroot
# fsck the filesystems again
fsck -fC /dev/vglocal/lvroot
fsck -fC /dev/vglocal/lvtmp
# rescue image 'mkswap' is sometimes not able to see a large swap
reboot
# finally, make a new swap signature that sees the whole LV
swapoff /dev/vglocal/lvswap
mkswap /dev/vglocal/lvswap
swapon /dev/vglocal/lvswap
```