If you are finding problem with your storage then you can simply do the following steps to add upto 1GB to your instance:
sudo dd if=/dev/zero of=/swapfile bs=1M count=1024
sudo mkswap /swapfile
sudo swapon /swapfile
To enable it by default after reboot, add this line to /etc/fstab:
/swapfile swap swap defaults 0 0