Consider the following points regarding Proactive Host Failover: GLYPH<SM590000> When an IBM Spectrum Virtualize system knows a node canister is about to go down, it  raises unit attentions to try to trigger host path failovers to surviving node canisters. GLYPH<SM590000> Requires the host to be tracking the preferred paths; usually requires ALUA support. GLYPH<SM590000> Delays the failback when a node canister is online until the node canister confirmed it is  ready to service I/O. GLYPH<SM590000> Works with and without NPIV enabled and for all connection protocols that IBM Spectrum  Virtualize system supports. GLYPH<SM590000> Adjusts preferred paths when node canisters are unavailable so that the IBM Spectrum  Virtualize system always is presenting a set of preferred paths. Chapter 5. Host configuration  307