一台机器安装多实例的时候 出现报错：
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
上网找了一些资料后，调整了下/etc/sysctl.conf，修改kernel.sem为
kernel.sem =5010 641280 5010 128
使它生效
#sysctl -p