[linux-lvm] Resize LVM2 partition under VMware

[linux-lvm] Resize LVM2 partition under VMware

[Naslain Christophe]

[-- Attachment #1: Type: text/plain, Size: 3154 bytes --]

Hi,

I have installed a CentOS5 with default partitioning using LVM2 into a VMware (Using VMware Free Server under Linux Fedora Core 7 as host). I now need to extend my VMware disk and partition from 20G to 30G.

What I did previously:
- I successfully extend the VMware disk (.vmdk using the VMware dedicated command: vmware-vdiskmanager).
- Then I have booted my VMware with a Knoppix to run fdisk and extend the partition /dev/sda2 from 20G to 30G.
- I have rebooted on my VMware disk and now try to extend the partition inside CentOS 5...

I first check the size of the disk:

[root@devcentos5 ~]# fdisk /dev/sda

The number of cylinders for this disk is set to 3916.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
   (e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): p

Disk /dev/sda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14        3916    31350847+  83  Linux

OK. /dev/sda2 is extended to 3916 which corresponds to 30G (the size I set using fdisk on Knoppix).

The LVM2 config:

[root@devcentos5 ~]# lvscan
  ACTIVE            '/dev/VolGroup00/LogVol00' [17.94 GB] inherit
  ACTIVE            '/dev/VolGroup00/LogVol01' [1.94 GB] inherit

My main partition is /dev/VolGroup00/LogVol00, the original size corresponds to 20G (17.94 GB once formatted). It uses /dev/sda2 as physical volume.

[root@devcentos5 ~]# lvdisplay 
  --- Logical volume ---
  LV Name                /dev/VolGroup00/LogVol00
  VG Name                VolGroup00
  LV UUID                m2HK0N-BIYP-F1QR-dLtO-BQ76-421H-2p5aXN
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                17.94 GB
  Current LE             574
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:0
   
  --- Logical volume ---
  LV Name                /dev/VolGroup00/LogVol01
  VG Name                VolGroup00
  LV UUID                vWw6Dm-7b4V-3SLL-6Uaq-WCc0-R91u-Eu1ABP
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                1.94 GB
  Current LE             62
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:1

Now I try to extend my volume using lvextend command:

[root@devcentos5 ~]# lvextend -L+10G /dev/VolGroup00/LogVol00 
  Extending logical volume LogVol00 to 27.94 GB
  Insufficient free space: 320 extents needed, but only 0 available

I tried system-config-lvm utility, but there is no unallocated space to use.

How can I get the additional 10G that I added to the /dev/sda2 partition?

Any idea?

Best,

Chris


[-- Attachment #2: Type: text/html, Size: 6013 bytes --]

Re: [linux-lvm] Resize LVM2 partition under VMware

[David Robinson]

> Now I try to extend my volume using lvextend command:
> 
> [root@devcentos5 ~]# lvextend -L+10G /dev/VolGroup00/LogVol00 
>   Extending logical volume LogVol00 to 27.94 GB
>   Insufficient free space: 320 extents needed, but only 0 available
> 
> I tried system-config-lvm utility, but there is no unallocated space to use.
> 
> How can I get the additional 10G that I added to the /dev/sda2 partition?

You missed "pvresize /dev/sda2". If the physical volume has changed size 
the pvresize command will resize the physical volume and therefore the 
volume group its within. If you were to run "vgdisplay VolGroup00" does 
it show the Free PE/Size that you expect?

--Dave

RE: [linux-lvm] Resize LVM2 partition under VMware

[Naslain Christophe]

Hi David,
Thank a lot for the info, that works fine:

[root@devcentos5 ~]# vgdisplay VolGroup00
  --- Volume group ---
  VG Name               VolGroup00
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  3
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               19.88 GB
  PE Size               32.00 MB
  Total PE              636
  Alloc PE / Size       636 / 19.88 GB
  Free  PE / Size       0 / 0
  VG UUID               Ix1XeP-LzJ0-3SEX-wMJ2-I4Im-2gWv-WCAgWm

[root@devcentos5 ~]# pvresize /dev/sda2
  Physical volume "/dev/sda2" changed
  1 physical volume(s) resized / 0 physical volume(s) not resized

Then I used system-config-lvm to resize the logical volume.

Best,

Chris