Problem with shared memory

System : IBM RS6000 model F50 AIX v 4.2.1 (Dual processor) 512Mb memory On this system we have 2 informix instances running : 1 Informix version 7.3 UD6 (Recently upgrade from version 5.05) 1 Informix version 5.05 UC2 (Running for several years on this machine) We had the following problem this morning in our Informix version 7.3 (at this moment the system was heavily loaded) With onstat -p we saw that there was more than 110 Mb memory in use. Error : 10:45:41 shmat: [EINVAL][22]: shared memory base address illegal 10:45:41 using 0xd0000000, needs 0xe0000000 10:45:41 shmat: [EINVAL][22]: shared memory base address illegal 10:45:41 using 0xd0000000, needs 0xe0000000Has anyone any idea what could cause this problem ? Informix : Version 7.3 UD6 # Shared Memory Parameters LOCKS 90000 # Maximum number of locks BUFFERS 10000 # Maximum number of shared buffers NUMAIOVPS 5 # Number of IO vps PHYSBUFF 32 # Physical log buffer size (Kbytes) LOGBUFF 32 # Logical log buffer size (Kbytes)LOGSMAX 125 # Maximum number of logical log files CLEANERS 7 # Number of buffer cleaner processes SHMBASE 0x30000000 # Shared memory base address SHMVIRTSIZE 8000 # initial virtual shared memory segment size SHMADD 8192 # Size of new shared memory segments (Kbytes) SHMTOTAL 0 # Total shared memory (Kbytes). 0=>unlimited CKPTINTVL 600 # Check point interval (in sec) LRUS 7 # Number of LRU queues LRU_MAX_DIRTY 14 # LRU percent dirty begin cleaning limit LRU_MIN_DIRTY 7 # LRU percent dirty end cleaning limit LTXHWM 40 # Long transaction high water markpercentage LTXEHWM 50 # Long transaction high water mark (exclusive) TXTIMEOUT 0x12c # Transaction timeout (in sec) STACKSIZE 32 # Stack size (Kbytes) Doris Willaert Suzuki Belgium Satenrosen 8 2550 Kontich Belgium Tel. : 32 3 4500478 Fax. : 32 3 4500451 E-mail : doris.willaert@suzuki.be