pmm-ras produces high CPU load

Symptoms

• pmm-ras process produces high CPU load:

  

• Plesk scheduled backup is in progress

Cause

Backup process intensively uses disk subsystem which might result into high load on servers. There is a request to optimize and improve backup process in the future: #PPPM-6758

Resolution

Since Plesk Obsidian 18.0.26 there is a possibility to set priority for backup processes. Go to Tools & Settings > Backup Manager (under “Tools & Resources”), click “Settings” and look for the “Run scheduled backup processes with low priority” and “Run all backup processes with low priority” options.

Note: Use faster hard disk, SSD-disk or RAID-massive, or arrange subscriptions between several hardware nodes.