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## starting with
[root@rhel7sat1 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 199G 0 part
├─rhel-root 253:0 0 150G 0 lvm /
├─rhel-swap 253:1 0 7.9G 0 lvm [SWAP]
└─rhel-home 253:2 0 9G 0 lvm /home
sr0 11:0 1 57.7M 0 rom
## create the new logical volume
[root@rhel7sat1 ~]# lvcreate -L 2G -n swap2 rhel
## format as swap
[root@rhel7sat1 ~]# mkswap /dev/rhel/swap2
## add to swap space
[root@rhel7sat1 ~]# swapon /dev/rhel/swap2
## edit /etc/fstab to make it permanent
[root@rhel7sat1 ~]# cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Tue Jul 21 21:49:23 2020
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/rhel-root / xfs defaults 0 0
UUID=1f9b7fed-b01a-4d1e-afec-6b81c9820846 /boot xfs defaults 0 0
/dev/mapper/rhel-home /home xfs defaults 0 0
/dev/mapper/rhel-swap swap swap defaults 0 0
/dev/mapper/rhel-swap2 swap swap defaults 0 0
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