65 Go RAM - 3 % RAM used - but system solaris 10 swap !!!

Hi,

Strange behaviour

I have 65 Go of RAM on my server, the RAM is used at 3%, but the solaris swap !!!

Server : Generic_141444-09 sun4v sparc SUNW,SPARC-Enterprise-T5220

Memory size: 65408 Megabytes

prstat -u rnfisrv -a 1
   PID USERNAME  SIZE   RSS STATE  PRI NICE      TIME  CPU PROCESS/NLWP
    89 rnfisrv   177M 9264K sleep   59    0   0:00:00 0.0% httpd-rnfi-643/1
  3045 rnfisrv   177M 8560K sleep   59    0   0:00:00 0.0% httpd-rnfi-643/1
  1032 rnfisrv   177M 9136K sleep   59    0   0:00:00 0.0% httpd-rnfi-643/1
 28558 rnfisrv   177M 9336K sleep   59    0   0:00:00 0.0% httpd-rnfi-643/1
 28494 rnfisrv   177M 9328K sleep   59    0   0:00:00 0.0% httpd-rnfi-643/1
  1999 rnfisrv   177M 8496K sleep   59    0   0:00:00 0.0% httpd-rnfi-643/1
   780 rnfisrv   177M 9080K sleep   59    0   0:00:00 0.0% httpd-rnfi-643/1
 26786 rnfisrv   177M 9328K sleep   59    0   0:00:00 0.0% httpd-rnfi-643/1
 25349 rnfisrv   177M 9392K sleep   59    0   0:00:00 0.0% httpd-rnfi-643/1
 29306 rnfisrv   177M 9200K sleep   59    0   0:00:00 0.0% httpd-rnfi-643/1
 16132 rnfisrv   177M 9200K sleep   59    0   0:00:01 0.0% httpd-rnfi-643/1