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storage consideration of Always On Failover Cluster Instance

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storage consideration of Always On Failover Cluster Instance

Postby chicagotech » Wed Aug 23, 2017 4:23 pm

Contrary to the availability group, an FCI must use shared storage between all nodes of the FCI for database and log storage. The shared storage can be in the form of WSFC cluster disks, disks on a SAN, Storage Spaces Direct (S2D), or file shares on an SMB. This way, all nodes in the FCI have the same view of instance data whenever a failover occurs. This does mean, however, that the shared storage has the potential of being the single point of failure, and FCI depends on the underlying storage solution to ensure data protection.
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