title: Zero evictions memcached, but items still disappear
body: <p>Items stored in Memcached seem to disappear without reason (TTL: 86400 but sometimes gone within 60s). However there's enough free space, and stats give zero evictions.</p>
  
  <p>The items that get lost seem to be the larger items. They seem to disappear after adding some other big items. Could it be the case "The slab" for larger items is full and items are being evicted without being reported?  </p>
  
  <p>Memcached version 1.4.5.</p>