LVM: Extend SWAP size by growing existing Logical Volume

LVM: Extend SWAP size by growing existing Logical Volume

# Tested on RHEL 5, 6 & 7

# Check which is the swap volume and its size

root@<server>:/#> cat /etc/fstab | grep swap
/dev/rvg/swaplv         swap                    swap    defaults        0 0


root@<server>:/#> lvdisplay /dev/rvg/swaplv
  --- Logical volume ---
  LV Name                /dev/rvg/swaplv
  VG Name                rvg
  LV UUID                m0EThc-4Epd-Ecj3-lvPK-BfU0-D98H-1pgyRY
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                13.69 GB
  Current LE             438
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:5


root@<server>:/#> free -m
             total       used       free     shared    buffers     cached
Mem:         11239       4556       6682          0        422       3697
-/+ buffers/cache:        436      10802
Swap:        14015          0      14015                                       <----


root@<server>:/#> cat /proc/swaps
Filename                                Type            Size    Used    Priority
/dev/mapper/rvg-swaplv                  partition       14352376        0       -3



# Disable swapping on LV to be resized (in our case, as we have a single LV allocated to swap, we could
# run command with '-a' flag so swapping is disabled on all known swap devices and files - as found in
# /proc/swaps or /etc/fstab)

# root@<server>:/#> swapoff -a

root@<server>:/#> swapoff /dev/rvg/swaplv



# Check that swapping has been disabled

root@<server>:/#> free
             total       used       free     shared    buffers     cached
Mem:      11508864    4657932    6850932          0     432268    3786136
-/+ buffers/cache:     439528   11069336
Swap:            0          0          0                                       <----




# Extend swap Logical Volume (we will add 1 GB)


# Verify that there is enough space on VG

root@<server>:/#> vgdisplay /dev/rvg
  --- Volume group ---
  VG Name               rvg
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  21
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                6
  Open LV               6
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               136.50 GB
  PE Size               32.00 MB
  Total PE              4368
  Alloc PE / Size       1718 / 53.69 GB
  Free  PE / Size       2650 / 82.81 GB                                         <----
  VG UUID               2TkcmU-Uzys-Znql-aXqx-pr2D-O8dk-oWsOlL



# Extend LV

root@<server>:/#> lvextend -L +1GB /dev/rvg/swaplv
  Extending logical volume swaplv to 14.69 GB
  Logical volume swaplv successfully resized



# Set up the new swap area

root@<server>:/#> mkswap /dev/rvg/swaplv
Setting up swapspace version 1, size = 15770578 kB



# Enable swapping on resized LV (in our case, as we have a single LV allocated to swap, we could
# run command with '-a' flag so swapping is enabled on all known swap devices and files (as found
# in /proc/swaps or /etc/fstab)


# root@<server>:/#> swapon -a


root@<server>:/#> swapon /dev/rvg/swaplv



# Check final size

root@<server>:/#> free
             total       used       free     shared    buffers     cached
Mem:      11508864    4664192    6844672          0     432284    3786136
-/+ buffers/cache:     445772   11063092
Swap:     15400952          0   15400952                                       <----
0 (0)
Article Rating (No Votes)
Rate this article
Attachments
There are no attachments for this article.
Comments
There are no comments for this article. Be the first to post a comment.
Full Name
Email Address
Security Code Security Code
Related Articles RSS Feed
Inxi – A Powerful Feature-Rich Commandline System Information Tool for Linux
Viewed 8389 times since Sat, Jun 2, 2018
SSH ProxyCommand example: Going through one host to reach another server
Viewed 1316 times since Tue, Aug 6, 2019
Lsyncd: live file syncronization across multiple Linux servers
Viewed 1117 times since Wed, Oct 31, 2018
RHEL: Services basic management - systemd
Viewed 9248 times since Sat, Jun 2, 2018
20 Linux YUM (Yellowdog Updater, Modified) Commands for Package Management YUM
Viewed 2223 times since Thu, Oct 25, 2018
CONFIGURE OCFS2
Viewed 1732 times since Sat, Jun 2, 2018
Linux get the list of FC HBA’s and WWPN
Viewed 913 times since Tue, May 22, 2018
Linux - How to shutdown or reboot
Viewed 422 times since Fri, Jun 8, 2018
BIND for the Small LAN
Viewed 1120 times since Sun, May 20, 2018
RHEL: Reserved space on a ext2/ext3/ext4 filesystem
Viewed 2291 times since Sun, May 27, 2018