[SOLVED] reducing LVM ?

mshlinux · 10-03-2015, 05:42 AM

in Fedora 22, I am trying to make room for other distro reducing my fedora LVM partition.

Code:

[msh@localhost ~]$ sudo lvscan
[sudo] password for msh: 
  ACTIVE            '/dev/fedora/swap' [7.75 GiB] inherit
  ACTIVE            '/dev/fedora/home' [407.32 GiB] inherit
  ACTIVE            '/dev/fedora/root' [50.00 GiB] inherit
[msh@localhost ~]$ lsblk
NAME            MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda               8:0    0 465.8G  0 disk 
├─sda1            8:1    0   200M  0 part /boot/efi
├─sda2            8:2    0   500M  0 part /boot
└─sda3            8:3    0 465.1G  0 part 
  ├─fedora-swap 253:0    0   7.8G  0 lvm  [SWAP]
  ├─fedora-root 253:1    0    50G  0 lvm  /
  └─fedora-home 253:2    0 407.3G  0 lvm  /home
sr0              11:0    1  1024M  0 rom

I want to make 50G standard partition (not LVM) at the end of my hard drive.
Eg:

Code:

|_sda4       8:4    0     50G

yes, I have read wiki pages a lot online.
but I just want any suggestion straight to my need beforehand.

rknichols · 10-04-2015, 10:51 AM

While LVM makes it simple to add space, shrinking existing space becomes harder. You'll need to do all this while booted from a live CD because you cannot shrink a filesystem while it is mounted. I suggest the gparted 0.23.0 live CD.

While running from that CD, start a terminal with root permissions and shrink your /home filesystem and LV:

Code:

lvresize --size=350G --resizefs /dev/fedora/home

Now, refresh the devices in gparted (Ctrl+R), and it should show that sda3 is no longer completely used. Click on "Resize/Move" and adjust that partition to the minimum allowed size. You should now have 50GB of unallocated space for a new partition. This assumes that fedora-home is physically located at the end of the PV. If not, resizing the partition is going to be harder.

Resizing filesystems is always a risky operation. I strongly recommend that you have a full backup before doing this.

mshlinux · 10-06-2015, 01:09 AM

thanks for ur suggestion...
yeah! right...

Quote:

While LVM makes it simple to add space, shrinking existing space becomes harder.

that is what I also notice.

Quote:

This assumes that fedora-home is physically located at the end of the PV. If not, resizing the partition is going to be harder.

My /dev/fedora/home is at the middle of physical volumn, unfortunately. So, I have to use "pvmove".

I did

Code:

# lvresize -L -50G --resizefs /dev/fedora/home
# pvmove --alloc anywhere /dev/sda3:xxxxxx-xxxxxx /dev/sda3:xxxxxx-xxxxxx
# pvresize --setphysicalvolumnsize 350G /dev/sda3

well done.