If the Sun Ray server does not have enough virtual memory available, the X Window server instance does not start and the user experiences a slow response. When virtual memory is insufficient, the Sun Ray server performs excessive disk swapping.

To determine whether the Sun Ray server is swapping to disk excessively, use the vmstat command:

# vmstat 5

If excessive swapping is occurring, the system might be undersized or overutilized.

The solution is to add more memory or increase the size of the swap partition.