SAPOSCOL not running ? (shared memory not available )

Hi,

When I check t code st06 , I get message saying "SAPOSCOL not running ? (shared memory not available )" , I'm on ECC 5.0 and having kernel release 640 Linux GNU SLES-7 i686 A with patch level 247. Also the SAPOSCOL Collector Version: COLL 20.88 640 - V1.12 for Linux. The same version is running on my Development server, whereas I'm getting this msg in prd. Can anybody suggest ??

Thanks & Best Regards,

Atul K