Rac Extended Cluster Several Scenario

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several scenario of failure and consequence.

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Rac Extended Cluster Several Scenario

  1. 1. <ul><li>Full utilization of resources no matter where they are located </li></ul>Site A All Work gets Distributed to All Nodes Site B Cache Fusion (RAC Interconnect) Benefits of RAC on Extended Clusters One Physical Database
  2. 2. RAC Extended : Recovering from node failure Site B One Physical Database Site A Cache Fusion (RAC Interconnect) <ul><li>Loosing 1 or more nodes from any sites !!! </li></ul><ul><li>Work should continues on both sites, on remaining nodes. </li></ul>Work should Continues on Remaining nodes
  3. 3. RAC Extended : Recovering from Storage failure Site B One Physical Database Site A Cache Fusion (RAC Interconnect) <ul><li>Loosing 1 out of the 2 storages !!! </li></ul><ul><li>Work should continues on all nodes from all sites. </li></ul>Work should Continues on Remaining Storage
  4. 4. RAC Extended : Recovering from site failure Work should Continues on Remaining Site Site B One Physical Database Site A Cache Fusion (RAC Interconnect) <ul><li>Loosing 1 Out of 2 sites !!! </li></ul><ul><li>Work should continues on remaining site. </li></ul>
  5. 5. RAC Extended : Recovering from communication failure … Work should Continues on Remaining Site, Which one ? Both ? Site B One Physical Database Site A Cache Fusion (RAC Interconnect) <ul><li>Loosing communication between sites !!! </li></ul><ul><li>What happens if all communications between sites is lost ? </li></ul><ul><li>“ SPLIT BRAIN” Or NOT ? </li></ul><ul><ul><ul><ul><ul><li> ONLY one site should survive !!! </li></ul></ul></ul></ul></ul>

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