title: What does 'MGMTCLASS' of a dataset describe?
body: <p>While allocating a dataset, What does <code>MGMTCLASS</code> of a dataset describe? To my knowledge it gives the retention and expiration period that it is gonna reside on disk and the possible values I have observed are <code>BKUP35</code>, <code>NOBKNLIM</code> etc. What are these stand for and what else are the possible value for this parameter? Hope I put my question exactly, please lemme know if i missed something...</p>
  
  <p>Addendum: Can i ask another question here. How often does a dataset is set to be backed up? I know it's specific to installation of <code>SMS</code>, but do we have something related to <code>MGMTCLASS</code>. Say dataset will be backed up when it stays some % of time specified on <code>MGMTCLASS</code> like that.. am I clear?</p>