Enhanced JFS file system cache limit Maxclient

Maxclient represents the maximum number of client pages that can be used for buffer cache.

The enhanced JFS file system uses client pages for its buffer cache. The limit on client pages in real memory is enforced using maxclient.

The LRU daemon begins to run when the number of client pages is within the number of minfree pages of maxclient 's threshold. The LRU daemon attempts to steal client pages that have not been referenced recently. If the number of file pages is lower than the value of the minperm parameter, any page that has not been referenced can be selected for replacement.

Maxclient also affects NFS clients and compressed pages. Also note that maxclient is generally set to a value that is less than or equal to the maxperm parameter.