Extending a logical volume

**r3negade** · 09-11-2009

I have a problem extending an existing logical volume when adding a new hard drive.

This is what my disk setup looked like before:

Code:

[root@centos ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                       64G  1.4G   60G   3% /
/dev/sda1              99M   19M   76M  20% /boot
tmpfs                 633M     0  633M   0% /dev/shm

I added a second hard drive to my server (/dev/sdb), formatted it with Linux LVM as its primary partition, and then put a logical ext3 partition on it.

Code:

[root@centos ~]# fdisk -l

Disk /dev/sda: 73.4 GB, 73407868928 bytes
255 heads, 63 sectors/track, 8924 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        8924    71577607+  8e  Linux LVM

Disk /dev/sdb: 36.9 GB, 36954401792 bytes
255 heads, 63 sectors/track, 4492 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1        4492    36081958+  8e  Linux LVM

I then created a physical volume for the disk with the command

Code:

pvcreate /dev/sdb1

I then ran

Code:

[root@centos ~]# vgextend /dev/VolGroup00 /dev/sdb1
  Volume group "VolGroup00" successfully extended

then

Code:

[root@centos ~]# lvextend /dev/VolGroup00/LogVol00 /dev/sdb1
  Extending logical volume LogVol00 to 100.16 GB
  Logical volume LogVol00 successfully resized

My first hard disk is ~65 GB and my second is ~35. So the combined total should be ~100.
So this output looks correct:

Code:

[root@centos ~]# lvdisplay
  --- Logical volume ---
  LV Name                /dev/VolGroup00/LogVol00
  VG Name                VolGroup00
  LV UUID                qYo1cg-ldD0-ursB-pbhi-EjUP-7yH8-eeLDIf
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                100.16 GB
  Current LE             3205
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0
   
  --- Logical volume ---
  LV Name                /dev/VolGroup00/LogVol01
  VG Name                VolGroup00
  LV UUID                Uvc0br-Fq2U-WYvi-9I98-ADLH-aKSj-COxsor
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                2.50 GB
  Current LE             80
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

(the combined total is ~100 GB)

But, "df -h" looks unchanged:

Code:

[root@centos ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                       64G  1.4G   60G   3% /
/dev/sda1              99M   19M   76M  20% /boot
tmpfs                 633M     0  633M   0% /dev/shm

How do I fix this? Must you "commit" the changes to the filesystem somehow?

**HROAdmin26** · 09-11-2009

Google: how to extend volume lvm

Thread Tools

Display

Extending a logical volume

Posting Permissions