LVM: Reduce SWAP size by removing a Logical Volume

LVM: Reduce SWAP size by removing a Logical Volume

# Tested on RHEL 5, 6 & 7

# Check current swap volume(s) and its size

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


root@<server>:/#> free -m
             total       used       free     shared    buffers     cached
Mem:         11239        392      10846          0        102        120
-/+ buffers/cache:        169      11069
Swap:        15039          0      15039                                       <----


root@<server>:/#> cat /proc/swaps
Filename                                Type            Size    Used    Priority
/dev/mapper/rvg-swaplv                  partition       14352376        0       -1
/dev/mapper/rvg-newswaplv               partition       1048568 0       -2




# We will reduce swap space by removing /dev/mapper/rvg-newswaplv Logical Volume

# Disable swapping on selected LV

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



# Check new size and partitions being used by swap

root@<server>:/#> free
             total       used       free     shared    buffers     cached
Mem:      11508864     401412   11107452          0     104992     123432
-/+ buffers/cache:     172988   11335876
Swap:     14352376          0   14352376                                       <----


root@<server>:/#> cat /proc/swaps
Filename                                Type            Size       Used    Priority
/dev/mapper/rvg-swaplv                  partition       14352376        0       -1



# Remove following line from /etc/fstab to prevent system from mounting removed LV

/dev/rvg/newswaplv         swap                    swap    defaults        0 0



# If necessary, completely remove Logical Volume

# root@<server>:/#> lvremove /dev/rvg/newswaplv
# Do you really want to remove active logical volume newswaplv? [y/n]: y
# Logical volume "newswaplv" successfully removed
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
Linux - How to shutdown or reboot
Viewed 890 times since Fri, Jun 8, 2018
Method 2 – Use shell scripts How to install yum cron on a CentOS/RHEL 6.x/7.x
Viewed 1262 times since Tue, Dec 4, 2018
VMWare tools free
Viewed 6473 times since Mon, Jul 16, 2018
ubuntu How to Reset Forgotten Root Password in Ubuntu
Viewed 622 times since Tue, Dec 8, 2020
Linux RAID Mdadm Cheat Sheet
Viewed 3048 times since Fri, May 15, 2020
Logrotate Example for Custom Logs
Viewed 1440 times since Sun, Jan 12, 2020
RHEL: iSCSI target/initiator configuration on RHEL7
Viewed 8371 times since Sat, Jun 2, 2018
SSH Essentials: Working with SSH Servers, Clients, and Keys
Viewed 2332 times since Wed, Jun 27, 2018
RHEL: Scan and configure new SAN (fibre channel) LUNs
Viewed 5577 times since Sun, May 27, 2018
How to encrypt a partition using LUKS?
Viewed 918 times since Fri, Jul 13, 2018