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. 

