客户反馈连接数不够，就从5120扩展到10240后，重启报错，日志如下
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl2/trace/orcl2_ora_308185.trc:
ORA-27154: post/wait create failed
ORA-27300: OS system dependent operation:semget failed with status: 28
ORA-27301: OS failure message: No space left on device
ORA-27302: failure occurred at: sskgpcreates
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl2/trace/orcl2_ora_56621.trc:
ORA-27154: post/wait create failed
ORA-27300: OS system dependent operation:semget failed with status: 28
ORA-27301: OS failure message: No space left on device
ORA-27302: failure occurred at: sskgpcreates
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl2/trace/orcl2_ora_308185.trc:
ORA-27154: post/wait create failed
ORA-27300: OS system dependent operation:semget failed with status: 28
ORA-27301: OS failure message: No space left on device
ORA-27302: failure occurred at: sskgpcreates
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl2/trace/orcl2_ora_56621.trc:
ORA-27154: post/wait create failed
ORA-27300: OS system dependent operation:semget failed with status: 28
ORA-27301: OS failure message: No space left on device
ORA-27302: failure occurred at: sskgpcreates
mos文档：DB provisioning fails with 'ORA-27300: OS system dependent operation:semget failed with status: 28' (Doc ID 2803688.1)
处理办法-在操作系统中操作把sem值放大一倍处理
把/etc/sysctl.conf文件中sem值调整到2倍，调整后如下
kernel.sem = 250 50000 100 200
执行 sysctl -p生效
配置后重新手动启动实例，启动正常