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
20 Linux YUM (Yellowdog Updater, Modified) Commands for Package Management YUM
Viewed 9555 times since Thu, Oct 25, 2018
How to run command or code in parallel in bash shell under Linux or Unix
Viewed 1150 times since Tue, Aug 6, 2019
OpenSSL: Find Out SSL Key Length – Linux Command Line
Viewed 1208 times since Mon, Feb 18, 2019
stunnel How To Encrypt Traffic to Redis with Stunnel on Ubuntu 16.04
Viewed 219 times since Sun, Dec 6, 2020
Exclude multiple files and directories with rsync
Viewed 758 times since Wed, Oct 31, 2018
10 Linux nslookup Command Examples for DNS Lookup
Viewed 768 times since Sun, Sep 30, 2018
Check a Website Availability from the Linux Command Line
Viewed 675 times since Mon, Feb 18, 2019
An easier way to manage disk decryption at boot with Red Hat Enterprise Linux 7.5 using NBDE
Viewed 3182 times since Mon, Aug 6, 2018
Linux – Securing your important files with XFS extendend attributes
Viewed 824 times since Wed, Jul 25, 2018
Securing /tmp and shm partitions
Viewed 685 times since Fri, May 15, 2020