RHEL6 RHEL7 RHEL8 RHEL9
| RAM size | Recommended swap size | Recommended swap size if allowing for hibernation |
| From 0 to 2GB | 2 times the RAM size | 3 times the RAM size |
| From 2GB to 8GB | The same size of the RAM | 2 times the RAM size |
| From 8GB to 64GB | At least 4GB | 1.5 times the RAM size |
| From 64GB | At least 4GB | Hibernation is not recommended |
Note: A 100GB swap is recommended if system with over 140 logical processes or over 3TB RAM
Reference:
https://access.redhat.com/solutions/15244