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This blog describes how to increase the size of the default logical volume VolGroup00-LogVol00 mounted at the root “/” directory of a guest vServer.

  1. Create a volume (say 100gb)
  2. Attach the volume to the vServer, for which you want to modify the size of the root partition.
  3. Log in, as the rootuser, to the vServer.
  4. Examine the current partitioning by running the following commands: 
     # df -h 
  5. Examine the available physical volumes on the vServer by running the following command:
     # cat /proc/partitions 
  6. Run the fdisk command, 

    # fdisk /dev/xvdb

Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.
The number of cylinders for this disk is set to 13054.
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)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
Command (m for help): p
Disk /dev/xvdb: 107.3 GB, 107374182400 bytes
255 heads, 63 sectors/track, 13054 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
    Device Boot      Start         End      Blocks   Id  System
Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-13054, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-13054, default 13054):
Using default value 13054
 
Command (m for help): t
Selected partition 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)
 
Command (m for help): p
 
Disk /dev/xvdb: 107.3 GB, 107374182400 bytes
255 heads, 63 sectors/track, 13054 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
 
    Device Boot      Start         End      Blocks   Id  System
/dev/xvdb1               1       13054   104856223+  8e  Linux LVM
 
Command (m for help): w
The partition table has been altered!
 
Calling ioctl() to re-read partition table.
Syncing disks.

7. Create a physical volume:

 # pvcreate /dev/xvdb1<br />

8.  Extend the volume group VolGroup00with the physical volume /dev/xvdb1:

 # vgextend VolGroup00 /dev/xvdb1  

9. Extend the logical volume LogVol00:

 # lvextend -l +100%FREE /dev/VolGroup00/LogVol00 

10. Resize the file system:

 # resize2fs /dev/VolGroup00/LogVol00 

11.   Check whether the root partition of the guest vServer has the updated size, by running the df -hcommand as shown in the following example:

 # df -h 

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