Need to extend my root LVM to add space

jakev383 · 11-25-2009, 07:58 PM

I installed F12 on my desktop, and now I want to extend the size of my root LVM. When it installed I did not notice that it only gave me a 3G root volume. There was other stuff on this machine when I did the install, but not I want to blow away the other data and make the whole drive my root volume.
Anyway, I tried running some tools to do this, but seem to be stuck in a rut. Here is what I have:

Code:

[root@JAKE-DLIN jake]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_jakedlin-lv_root
                      2.8G  2.6G  179M  94% /
tmpfs                 498M  260K  497M   1% /dev/shm
/dev/sda1             194M   22M  163M  12% /boot

Code:

Disk /dev/sda: 40.0 GB, 40016019456 bytes
255 heads, 63 sectors/track, 4865 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x98e098e0

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          26      204800   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              26         650     5015552   8e  Linux LVM
Partition 2 does not end on cylinder boundary.
/dev/sda3             651        4865    33856987+  83  Linux

Disk /dev/dm-0: 34.4 GB, 34359738368 bytes
255 heads, 63 sectors/track, 4177 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000

Disk /dev/dm-0 doesn't contain a valid partition table

Disk /dev/dm-1: 2113 MB, 2113929216 bytes
255 heads, 63 sectors/track, 257 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000

Disk /dev/dm-1 doesn't contain a valid partition table

I ran this command:

Code:

lvextend -L32G /dev/vg_jakedlin/lv_root

But I still get this:

Code:

[jake@JAKE-DLIN ~]$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_jakedlin-lv_root
                      2.8G  2.6G  179M  94% /
tmpfs                 498M  260K  497M   1% /dev/shm
/dev/sda1             194M   22M  163M  12% /boot

Here is some other relevant information:

Code:

[root@JAKE-DLIN jake]# lvdisplay
  --- Logical volume ---
  LV Name                /dev/vg_jakedlin/lv_root
  VG Name                vg_jakedlin
  LV UUID                puBeqE-srUX-s4NP-3kO3-OQWi-ERbe-ItWt1b
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                32.00 GB
  Current LE             8192
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0
   
  --- Logical volume ---
  LV Name                /dev/vg_jakedlin/lv_swap
  VG Name                vg_jakedlin
  LV UUID                mibFF0-trBv-zJ1e-hDCs-oESP-p2TO-t5SE15
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                1.97 GB
  Current LE             504
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

[root@JAKE-DLIN jake]# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               vg_jakedlin
  PV Size               4.78 GB / not usable 2.00 MB
  Allocatable           yes (but full)
  PE Size (KByte)       4096
  Total PE              1224
  Free PE               0
  Allocated PE          1224
  PV UUID               86ExXj-O8HE-hF0c-8LuG-IXF6-c3sW-praMSF
   
  --- Physical volume ---
  PV Name               /dev/sda3
  VG Name               vg_jakedlin
  PV Size               29.71 GB / not usable 3.80 MB
  Allocatable           yes 
  PE Size (KByte)       4096
  Total PE              7606
  Free PE               134
  Allocated PE          7472
  PV UUID               uaDoZV-jtbG-0RD0-R6v7-0PGh-X3Al-fBBhC9

I obviously cannot unmount the root volume on a live system. Do I need to boot into a LVM aware LiveCD and extend the volume there?
Any help is appreciated.

syg00 · 11-25-2009, 09:11 PM

You need to extend the filesystem as well as the lv - what you've (effectively) done is analogous to resizing a (normal, non-LVM) partition without resizing the filesystem within.
I would expect Fedora to have a GUI for this - there are docs on the Redhat site, and tldp.org on how to do it with CLI commands.

And yes, I'd be inclined to do it from a liveCD.

jakev383 · 11-25-2009, 10:01 PM

Thanks for that. I booted into my livecd, and then just:
resize2fs -p /dev/vg_jakedlin/lv_root

Rebooted (after a fsck) and all was well again!