2014-05-24 2 Add Extra Disk Space

Overview

During 04 Install OMS 12.1.0.3.1, I found that CRONULLA had 5GB less disk space than expected. I use the Logical Volume Manager to add extra disk space after I update the VirtualBox settings to include an extra disk drive.

References

• Oracle® Linux Administrator's Guide for Release 6
  • III Storage and File Systems
    • 16 Storage Management
      • 16.3 About Logical Volume Manager
        • 16.3.1 Initializing and Managing Physical Volumes
        • 16.3.2 Creating and Managing Volume Groups
        • 16.3.3 Creating and Managing Logical Volumes
• Michael Kerrisk - man7.org
  • df
  • fsadm
  • lvdisplay
  • lvresize
  • pvcreate
  • vgdisplay
  • vgextend

Procedure

Shut Down CRONULLA

Shut down the CRONULLA so that I can add an extra disk drive.

Add an Extra Disk Drive

I decided to add an extra disk drive of size 20GB to CRONULLA VM.

Start Up CRONULLA

Start up the CRONULLA so that I can format the extra disk drive.

Add Extra Space

Create New Physical Volume

Following the procedure in 16.3.1 Initializing and Managing Physical Volumes, the new disk drive, /dev/sdb, by using the pvcreate command:

[root@cronulla ~]# pvcreate /dev/sdb Physical volume "/dev/sdb" successfully created

Add New Physical Disk to Volume Group

First, I discover the current volume group names through the vgdisplay command:

[root@cronulla ~]# vgdisplay --- Volume group --- VG Name vg_cronulla 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 29.51 GiB PE Size 4.00 MiB Total PE 7554 Alloc PE / Size 7554 / 29.51 GiB Free PE / Size 0 / 0 VG UUID 0z9I6F-KqWK-NX7m-V6HE-brRQ-mkH8-gL1kpC

Using the discovered name of vg_cronulla, I followed the procedure in 16.3.2 Creating and Managing Volume Groups in order to extend the volume group to include the new physical volume on /dev/sdb through the use of the vgextend command:

[root@cronulla ~]# vgextend vg_cronulla /dev/sdb Volume group "vg_cronulla" successfully extended

Increase the Size of the Logical Volume

16.3.3 Creating and Managing Logical Volumes suggested the use of the lvresize command.

I used the lvdisplay command to discover the name of the logical volume that needed to be extended:

[root@cronulla ~]# lvdisplay --- Logical volume --- LV Path /dev/vg_cronulla/lv_root LV Name lv_root VG Name vg_cronulla LV UUID HbxPah-4LhC-NPfB-MRO5-8NpQ-vIiE-caZh2D LV Write Access read/write LV Creation host, time cronulla.yaocm.id.au, 2014-03-02 18:02:33 +1100 LV Status available # open 1 LV Size 26.51 GiB Current LE 6786 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 252:0 --- Logical volume --- LV Path /dev/vg_cronulla/lv_swap LV Name lv_swap VG Name vg_cronulla LV UUID 0EnfzH-7aK1-zbPH-UYyS-C9Ks-mxej-WPGSPv LV Write Access read/write LV Creation host, time cronulla.yaocm.id.au, 2014-03-02 18:02:36 +1100 LV Status available # open 2 LV Size 3.00 GiB Current LE 768 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 252:1

I then used the lvresize command to extend vg_cronulla/lv_root by 10 GB:

[root@cronulla ~]# lvresize --size +10G vg_cronulla/lv_root Extending logical volume lv_root to 36.51 GiB Logical volume lv_root successfully resized

Increase the File System Size

I used the fsadm command to increase the root filesystem to use all of the newly available space on its logical volume:

[root@cronulla ~]# fsadm resize /dev/mapper/vg_cronulla-lv_root resize2fs 1.43-WIP (20-Jun-2013) Filesystem at /dev/mapper/vg_cronulla-lv_root is mounted on /; on-line resizing required old_desc_blocks = 2, new_desc_blocks = 3 The filesystem on /dev/mapper/vg_cronulla-lv_root is now 9570304 blocks long.

I confirmed the new size of the filesystem through the df command:

[root@cronulla ~]# df -lh Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_cronulla-lv_root 36G 15G 20G 44% / tmpfs 3.0G 0 3.0G 0% /dev/shm /dev/sda1 477M 55M 398M 13% /boot