Hi Amar,
Can you check the os limit for warning "Too many open files"? Maybe the open file up to limit, thus this warning occurs.
If it is already checked and without problem, please attach diagpack.tgz after executing command:
dbmcli -d <dbsid> -u control,<password> diag_pack
You will find diagpack.tgz from maxdb run directory.
Best regards,
James