OVERVIEW SBD is a storage-based extended protection service that stands for STONITH Block Device.  The highest priority for highly available clusters is to protect data integrity. This protection is achieved by preventing uncoordinated parallel access to data stores. Clusters use several control mechanisms to achieve this goal. However, electing several DCs in a cluster can result in network partitions or software failures. If this so-called "node splitting" is allowed to occur, data corruption may occur.  The main mechanism that can be used to avoid this situation is node shielding through STONITH. If SBD is used as a node shielding mechanism ...Read more