In the event of a disk failure, which process will immediately and automatically scan Cassandra to find all data previously hosted on the failed disk, and all disks in that node?
The correct answer is D. Curator.
Explanation:
In Nutanix, Curator is the process responsible for performing background tasks like data maintenance, including rebalancing and rebuilding data after a disk or node failure. When a disk fails, Curator scans the metadata in Cassandra to identify the missing data and initiates the process to rebuild or redistribute it across the cluster, ensuring data resiliency.
Other processes:
Stargate handles data I/O requests.
Genesis is responsible for cluster management and initialization tasks.
Prism is the management interface and does not handle data recovery.
In the event of a disk failure, a Curator scan (MapReduce Framework) will occur immediately. It will scan the metadata (Cassandra) to find the data previously hosted on the failed disk and the nodes / disks hosting the replicas.
https://www.nutanixbible.com/4c-book-of-aos-storage.html
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