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VCC_MAXSIZE is a system parameter that controls the size of the virtual I/O cache. VCC_MAXSIZE, which specifies the size in blocks, is 3,700,000 by default. The virtual I/O cache cannot shrink or grow. Its size is fixed at system startup. To adjust the XFC size, use the VCC_MAX_CACHE system parameter. VCC_MAXSIZE is an AUTOGEN parameter. This parameter is available on Alpha and Integrity servers only.