初学安装informix 11.5 for linux5 ,遇到问题，求助。

[informix@localhost informix]$ oninit -iv

This action will initialize IBM Informix Dynamic Server;
any existing IBM Informix Dynamic Server databases will NOT be accessible -
Do you wish to continue (y/n)? y
oninit: Fatal error in shared memory creation
Reading configuration file '/usr/informix/etc/onconfig'...succeeded
Creating /INFORMIXTMP/.infxdirs...succeeded
Checking config parameters...succeeded
Allocating and attaching to shared memory...FAILED

WARNING: server initialization failed, or possibly timed out (if -w was used).
Check the message log, online.log, for errors.收起