the new bie with the share memory problem

Hi all: Thanks for all those who has responded to my previous question, you guy were a great help. Now I have put all the necessary stuff in /etc/system, rebooted, ran oninit -v, my results are: oninit -vReading configuration file '/usr/yan/Informix/INFX_ODS_723/online/etc/onconfig.learn'...succeeded Creating /etc/.infxdirs ... succeeded Creating infos file "/usr/yan/Informix/INFX_ODS_723/online/etc/.infos.Hamlet" ... "/usr/yan/Informix/INFX_ODS_723/online/etc/.conf.Hamlet" ... succeeded Writing to infos file ... succeeded Checking config parameters...succeeded Allocating and attaching to shared memory...succeeded Creating resident pool 476 kbytes...succeeded Creating buffer pool 402 kbytes...succeeded Initializing rhead structure...succeeded Initializing ASF ...succeeded Initializing Dictionary Cache and Stored Procedure Cache...succeeded Onlining 0 additional cpu vps...succeeded Onlining 2 IO vps...succeeded Forking main_loop thread...succeeded Initialzing DR structures...succeeded Forking 1 'ipcshm' listener threads...succeeded Starting tracing...succeeded Initializing 1 flushers...succeeded oninit: Cannot open chunk '/work/data'. errno = 4 oninit: Fatal error in shared memory initialization ok, I have created /work/data/root_chunk file, it's owned by informix.informix, could someone please tell me what I am missing here? thanks so much. yan