ORA-27154: post/wait create failed. ORA-27300: OS system dependent operation:semget failed with status: 28 ...

set semsys:seminfo_semmsl = 2048
* to match number of Oracle processes

The value above must be greater than the sum of all initSID.ora processes
values for all instances on the system

Please restart the system as kernel parameter need init to be restart so restarting init means restarting system to better reboot

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