Each logical compartment includes placement policy including a set of storage placement rules for placement of storage symbols into {HEAD ~ a set} of {TAIL ~ physical storage containers} 
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Each logical compartment includes placement policy including a set of storage placement rules for placement of storage symbols into { HEAD ~ a set } of { TAIL ~ physical storage containers }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL