Oracle RAC is using shared-disk architecture. I cant see why this can make the whole product highly scalable or available ? the shared storage can itself turn into a single point of failure. and if we are using for example SAN for our storage, we are as scalable as the SAN controller and we will need to replicate our data into other SANs or another lun in our current SAN. Its like we are using storage for every replica in isolation and its kind of like shared-nothing architecture in which we gather all of our data in one place physically. what is the benefit of sharing here?
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