Virtual Memory

We have a system with swap less than half  the size I would like, 5 GB swap 
with 8 GB real. Last week we started to run out of  virtual memory while real 
memory usage was still low. There was only 400 MB virtual memory remaining but 
2 GB real memory available. What I'm curious about is if we run out of virtual 
memory will the system be affected or will it just start using more of the real 
memory. When I asked one person he said we could still run out of kernel 
resources and I asked him to elaborate but haven't heard back. If anyone can 
shed light on how the system would handle the situation I would appreciate it. 
Also we plan on rebuilding swap with 1.5 times real memory as a standard. Does 
anyone else have a standard they follow for allocating swap? 
 
 We are running on Solaris 2.9.
 
 Thx, Dave


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