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[DOUBT] Memory high in idle process on Solaris 10 (Memory Utilization > 90%)

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http://www.unix.com – Hi Experts, Our servers running Solaris 10 with SAP Application. The memory utilization always >90%, but the process on SAP is too less even nothing. Why memory utilization on solaris always looks high? I have statement about memory on solaris, is this true: Memory in solaris is used for I/O cache, so if there is no memory in used, memory will be used by I/O cache. If the Application need memory, the I/O cache will release the memory. If the "sr" value on vmstat > 300, there is bottleneck on memory. What is the mechanism of memory utilization on solaris? Any comments ar (HowTos)