Server failure

Hello! IUS writes the follwing output into the server log file and crashs. I don't what's wrong. I try 'oncheck -cI 4194323' because the IUS server is down and I can't restart the server. The output of onlog has a very big size and is very sophisticated. How can I repair something with onlog? Is it a hardware or a software problem? What means "Insufficient space for index change rollback"? How can I solve the problem? Is it possible that an application can cause this faliure? I only get IUS running by make a cold restore :-( <server log file> 16:34:21 Assert Failed: Insufficient space for index change rollback. 16:34:21 INFORMIX-Universal Server Version 9.14.UC5 16:34:21 Who: Session(79, informix@machine_name, 16208, 0) Thread(95, sqlexec, 0, 1) File: rskey.c Line: 1026 16:34:21 Results: Index 'db_name:"informix".sysprocplan-Key#(unknown)'is now unusable 16:34:21 Action: Run 'oncheck -cI 4194323' 16:34:21 See Also: /tmp/af.5f676c 16:34:21 Assert Failed: Rollback error 100 16:34:21 INFORMIX-Universal Server Version 9.14.UC5 16:34:21 Who: Session(79, informix@machine_name, 16208, 0) Thread(95, sqlexec, 0, 1) File: rstrans.c Line: 2036 16:34:21 Results: Log record (OLDRSAM:DELITEM) in log 2039, offset0xa2588 was not rolled back 16:34:21 Action: Use 'onlog' to view the transaction and repair manually. </server log file> Who can help me? Thanks in advance, Stefan