We have an ontape backups from a IDS 7.31.UD8X7 with AIX 4.3.3.

For some reason we need to restore this on IDS 7.31.UD8X7 with AIX 5.3.

For a instance with small databases (< 10 GB) it worked fine.
Then we tried for a instance with bigger databases (> 50 GB).

Here the instance went down:
13:57:21 Physical Restore of rootdbs, physdbs, logdbs, svvs001,
svvs002, svvs003, svvs004, svvs005, svvs006, svvs007, svvs008
Completed.
13:57:21 Checkpoint Completed: duration was 0 seconds.
13:57:21 Checkpoint loguniq 33654, logpos 0x2d018

13:58:06 No logical log restore will be performed.
13:58:06 Clearing the physical and logical logs has started
14:39:00 Cleared 7999 MB of the physical and logical logs in 2454
seconds
14:39:00 Physical Recovery Started.
14:39:00 Physical Recovery Complete: 0 Pages Restored.
14:39:00 Logical Recovery Started.
14:39:03 Logical Recovery Complete.
0 Committed, 0 Rolled Back, 0 Open, 0 Bad Locks

14:39:04 Bringing system to Quiescent Mode with no Logical Restore.

14:39:05 Quiescent Mode
14:39:05 Assert Failed: Dynamic Server must abort
14:39:05 IBM Informix Dynamic Server Version 7.31.UD8X7
14:39:05 Who: Session(1, informix@ffzd0xa6, 0, 1342709784)
Thread(7, main_loop(), 50058018, 3)
File: rslog.c Line: 3271
14:39:05 Results: Dynamic Server must abort
14:39:05 Action: Reinitialize shared memory
14:40:53 See Also: /opt/informix/IDS.7.31.UD8/tmp/af.3ef72f9,
shmem.3ef72f9.0
14:40:53 Error writing
'/opt/informix/IDS.7.31.UD8/tmp/shmem.3ef72f9.0' errno = 28
14:40:53 rslog.c, line 3271, thread 7, proc id 950330, Dynamic Server
must abort.
14:40:53 PANIC: Attempting to bring system down

I heard it's officially not supported. But I can't see the reason for
this ?
Isn't AIX 5.3 binary compatible to AIX 4.3.3 ???

Thanks,
Jürgen