We have two machines in SUN Cluster 3.0 :

Node A SUN V440 with 8GB RAM
Node B SUN V440 with 4GB RAM

When we try to load ( onload ) databases on node A, informix requests more and more virtual segments, and finally hangs ( the last segment is about 2 GB ). If I set SHMTOTAL to non zero value informix will reach this value and return error : size of resident + virtual segments > SHMTOTAL

On node B everything is OK ( without request new shared memory ).
ONCONFIG and /etc/system are the same on two nodes.
Some parameters from onconfig :

SHMBASE=0x0A000000L
SMHVIRTSIZE=262144
SHMADD=65536

Is there any limitation of RAM ?

Thanks
Tom