Extending an ext3 partition with LVM

LVM is quite technical but very powerful, here is extending an ext3 filesystem that is stored on a logical volume under Linux LVM.

Starting with a spare disk, setup with 4 LVM partitions:

[root@hpmicro ~]# fdisk -l /dev/sdb

Disk /dev/sdb: 320.0 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1        9727    78132096   8e  Linux LVM
/dev/sdb2            9728       19454    78132127+  8e  Linux LVM
/dev/sdb3           19455       29181    78132127+  8e  Linux LVM
/dev/sdb4           29182       38913    78172290   8e  Linux LVM


I make the first two into a LVM ext3 filesystem:

[root@hpmicro ~]# pvcreate /dev/sdb1
  Physical volume "/dev/sdb1" successfully created
[root@hpmicro ~]# pvcreate /dev/sdb2
  Physical volume "/dev/sdb2" successfully created

Create a volume group "TempVG" that uses these two partitions:

[root@hpmicro ~]# vgcreate TempVG /dev/sdb1 /dev/sdb2
  Volume group "TempVG" successfully created

Create a logical volume that uses storage from TempVG:

[root@hpmicro ~]# lvcreate --name TempVol00 --size 140G TempVG
  Logical volume "TempVol00" created

Create the filesystem on the logical volume:

[root@hpmicro ~]# mkfs -t ext3 /dev/TempVG/TempVol00


Mount the filesystem

[root@hpmicro ~]# mkdir /store
[root@hpmicro ~]# mount /dev/TempVG/TempVol00 /store

Now create the other two PV's:

[root@hpmicro disc]# pvcreate /dev/sdb3
  Physical volume "/dev/sdb3" successfully created
[root@hpmicro disc]# pvcreate /dev/sdb4
  Physical volume "/dev/sdb4" successfully created

Extend the existing volume group:

[root@hpmicro disc]# vgextend TempVG /dev/sdb3 /dev/sdb4
  Volume group "TempVG" successfully extended

Extend the logical volume:

 lvresize -L+150G /dev/mapper/TempVG-TempVol00
  Extending logical volume TempVol00 to 290.00 GB
  Logical volume TempVol00 successfully resized

Now resize the filesystem on that logical volume (checking with df sizes before and after):

[root@hpmicro disc]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/TempVG-TempVol00
                      138G  4.8G  127G   4% /store

[root@hpmicro ~]# resize2fs  /dev/mapper/TempVG-TempVol00
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/mapper/TempVG-TempVol00 is mounted on /store; on-line resizing required
Performing an on-line resize of /dev/mapper/TempVG-TempVol00 to 76021760 (4k) blocks.
The filesystem on /dev/mapper/TempVG-TempVol00 is now 76021760 blocks long.

[root@hpmicro ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/TempVG-TempVol00
                      286G  191M  271G   1% /store