Questions no: High I/O volume type during WAN COM failure
Verified answer:B. Logging volume
Step by Step Comprehensive Detailed Explanation with References:During a WAN COM failure in a VPLEX Metro environment, logging volumes are subjected to high levels of I/O. This is because the logging volumes are used to store write logs that ensure data integrity and consistency across distributed volumes.
These logs play a critical role during recovery processes, especially when there is a communication failure between clusters.
* Role of Logging Volumes: Logging volumes in VPLEX are designed to capture write operations that cannot be immediately mirrored across the clusters due to network issues or WAN COM failures1.
* WAN COM Failure: When a WAN COM failure occurs, the VPLEX system continues to write to the local logging volumes to ensure no data loss. Once the WAN COM link is restored, the logs are used to synchronize the data across the clusters1.
* High I/O Levels: The high levels of I/O on the logging volumes during a WAN COM failure are due to the accumulation of write operations that need to be logged until the link is restored and the data can be synchronized1.
* Recovery Process: After the WAN COM link is restored, the VPLEX system uses the data in the logging volumes to rebuild and synchronize the distributed volumes, ensuring data consistency and integrity1.
* Best Practices: EMC best practices recommend monitoring the health and performance of logging volumes, especially during WAN COM failures, to ensure they can handle the increased I/O load and maintain system performance1.
In summary, logging volumes experience high levels of I/O only during a WAN COM failure as they are responsible for capturing and storing write operations until the communication between clusters can be re-established and data synchronization can occur.