[SOLVED] Resizing an LVM2 partition (PV)

[Renich]

Hello,

First, a little explanation of where I am standing:

I have a virtual instance of Fedora 16 running on KVM/Qemu.
The partition table is simple: /boot (500 MB) and lv_root (5.5 GB) (yes, no swap).
Now, I resized the fedora HDD image with qemu-img. It was 6 GB and now it's 7 GB.

I'd like to resize the lvm partition /dev/vda2
how can I do that?

lvresize is not working; neither is pvresize.

I'm trying to make a script that resizes (extends, no reduction) your partition (using rc.local) at boot time. Automatic resizing, eh?

Anyway, I'd appreciate some help regarding the /dev/vda2 resize. It should be better if it's a one-liner; requiring no user interaction.

---------- Post added at 01:51 AM ---------- Previous post was at 12:30 AM ----------

Ok, it's solved. Here's what I did:

First, delete and recreate the partition table:

gdisk /dev/vda (yep, I'm using GPT)
d 2 <enter>
n 2 <enter>
<enter>
<enter>
<enter>
8e00 (this should be your partition type. In this case, this one is a LVM partition)
w (don't forget to write the partition table)

Then, very important, run:

partprobe

in order to update the partitions on your OS. I had to reboot after this... ;=s

Then, everything is sooooo simple:

pvresize /var/vda2
lvresize -r -l +100%FREE /dev/mapper/vg_f16-lv_root

Done!

I'd still would like to automate this. Any bash script proposal (/etc/rc.local) is appreciated!

[shisatum]

Renich, I'm having the same issue. I did not think this through before acting.
I typed this from the GParted LiveCD: (sda2 is my fedora partition)

gdisk /dev/sda2
d 2
n 2 <enter>, <enter>, <enter>...
w

When I typed partprobe, it did not work, now the file system is still there but it is unrecognizable. What can I attempt to recover the home file? It is all I need.

Thanks in advance for any help!

[Renich]

Originally Posted by shisatum

Renich, I'm having the same issue. I did not think this through before acting.
I typed this from the GParted LiveCD: (sda2 is my fedora partition)

gdisk /dev/sda2
d 2
n 2 <enter>, <enter>, <enter>...
w

When I typed partprobe, it did not work, now the file system is still there but it is unrecognizable. What can I attempt to recover the home file? It is all I need.
!

Well, I think you got the partition type wrong. Most probably, you have LVM so, try gdisk again, but, this time:

gdisk /dev/sda <enter>
d 2 <enter>
n 2 <enter>
<enter>
<enter>
<enter>
8e00

[shisatum]

Thank you,

I have now done this and it appeared to work, yet the partition is still recognized as unknown and when I attempt to boot I am stuck at the the grub bootloader.

[Renich]

Originally Posted by shisatum

Thank you,

I have now done this and it appeared to work, yet the partition is still recognized as unknown and when I attempt to boot I am stuck at the the grub bootloader.

You might want to check /etc/fstab

I am sure it has a UUID reference. Remove that and use /dev/sda2 instead. The UUID surely changed.

[shisatum]

cat fstab is:

aufs / aufs rw 0 0
tmpfs /tmp tmpfs nosuid,nodev 0 0

[Renich]

Huh? That can't be. Were is your system?

I think you booted on a LiveCD or something and then tried cat /etc/fstab

If you're using the Fedora Rescue CD, be sure to let it find a system and ask it to mount it. Then, just cat /mnt/sysimage/etc/fstab

[anishjp]

Originally Posted by Renich

Hello,

I have a virtual instance of Fedora 16 running on KVM/Qemu.
The partition table is simple: /boot (500 MB) and lv_root (5.5 GB) (yes, no swap).
Now, I resized the fedora HDD image with qemu-img. It was 6 GB and now it's 7 GB.

I'd like to resize the lvm partition /dev/vda2
how can I do that?

lvresize is not working; neither is pvresize.

I'm trying to make a script that resizes (extends, no reduction) your partition (using rc.local) at boot time. Automatic resizing, eh?

Do you see the the free space in your volume group after increasing the HDD size? Check if there are any free physical extends in your volume group

	
	
vgscan
 :- displays all your volume groups


	
	
vgdisplay /dev/*****volume group name of lv_root****
lvextend -n /dev/volume_group_name/lv_root -L mazimum sizeM

fsck -f /dev/volume_group_name/lv_root

resize2fs -p /dev/mapper/volume group name-lv_root

check the size of the new file system

df -h

logical volume extension should be done very carefuly or you may break ur system!