The Linux kernel limits total real-time CPU usage to prevent starvation. Default: 950000 µs (95% of 1 second). If RT processes exceed this, the kernel denies further RT requests.
Oracle asks for the steering wheel, but the Operating System refuses to let go. crs-1726 process failed to run in real-time priority
Then create custom policy.
In the high-stakes environment of enterprise database management, few things are as anxiety-inducing as a node eviction or a Clusterware startup failure. Among the myriad of error codes that Oracle Administrators (DBAs) encounter, stands out as a particularly tricky diagnostic challenge. The Linux kernel limits total real-time CPU usage
[Service] LimitRTPRIO=99 LimitMEMLOCK=infinity Oracle asks for the steering wheel, but the
Oracle Clusterware acts as the nerve center of the RAC database. It must maintain constant communication between nodes (heartbeats) to ensure data integrity. If a node misses a heartbeat, the cluster assumes the node is dead and evicts it to prevent a "split-brain" scenario where two nodes try to write to the same storage simultaneously.
When the OS denies this priority, the agent falls back to normal scheduling. While the cluster may still run, it becomes vulnerable to latency spikes.