sorry, some number not right

there are total 43 databases on that server.
40 are on RAC,
they have 2 node cluster and 40 databases.

After reboot , only 33 databases are able to come up online by themselves.
Rest of them fail to come up.

When trying to manually start instance, still getting error.

From ora.inst file in racg folder found
===
SQL> ORA-27102: out of memory
SVR4 Error: 28: No space left on device
===

So change project and kernel settings as below

Modified shmmax in /etc/system file as below
set shmsys:shminfo_shmmax=6442450944

% projmod -s -K "project.max-shm-memory=(privileged,2.00TB,deny)" system
% projmod -s -K "process.max-sem-nsems=(privileged,2048,deny)" system

Rebooted node after these changes, still only 33 came up online, rest failed to come up with same error

The workaround as of now is to start remaining databases manually using sqlplus.