An administrator needs to limit the size of the filesystem cache. Which tuning parameters need to be adjusted?

minfree and maxfree set the free memory list thresholds that trigger the page-stealing daemon (lrud) to reclaim pages, not the filesystem cache size boundaries.

minperm and maxperm define the percentage range of real memory frames that may hold persistent file-backed pages, but do not impose a direct bounded size limit on the filesystem cache.

minfreemem and maxfreemem are not standard AIX VMM tuning parameters associated with controlling filesystem cache size.

minpgahead and maxpgahead control the number of pages read ahead during sequential I/O operations and have no effect on the overall size of the filesystem cache.

In AIX, sb_min and sb_max are Virtual Memory Manager (VMM) parameters set via the vmo command that define the minimum and maximum amount of real memory allocated to the filesystem buffer cache. Adjusting these parameters directly constrains how large the filesystem cache is permitted to grow, preventing it from consuming excessive system memory at the expense of application workloads.