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adding swap space – RH7.x

a. stop swap activity on the existing swap partition or partitions

# swapoff -v /dev/mapper/rootvg-swap

create new swap volume (this host is not using fdisk partitions but logical volume manager), give it 2GB.

# lvcreate rootvg -n swap-vol2 -L 2G

turn it into swap

# mkswap /dev/mapper/swap-vol2

activate it

# swapon -v /dev/mapper/swap-vol2

edit /etc/fstab to so it comes back every time the hosts is booted.

# echo "/dev/mapper/rootvg-swap-vol2 swap                swap    defaults        0 0" >> /etc/fstab

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