2V0-621 · Question #70
2V0-621 Question #70: Real Exam Question with Answer & Explanation
The correct answer is A: Enable Storage IO Control.. Storage I/O Control mitigates cross-host I/O contention on shared VMFS datastores by coordinating I/O prioritization and throttling across all hosts at the vCenter level. It is the purpose-built solution when one host's storage activity degrades performance for other hosts on the
Question
Options
- AEnable Storage IO Control.
- BConfigure Storage DRS.
- CEnable the Dynamic Queue Depth Throttling option.
- DConfigure the Disk.SchedNumReqOutstanding parameter.
Explanation
Storage I/O Control mitigates cross-host I/O contention on shared VMFS datastores by coordinating I/O prioritization and throttling across all hosts at the vCenter level. It is the purpose-built solution when one host's storage activity degrades performance for other hosts on the same datastore.
Common mistakes.
- B. Storage DRS handles initial VM placement and migration across datastores for capacity and performance balancing, but does not throttle active I/O in real time between multiple hosts accessing the same datastore.
- C. Dynamic Queue Depth Throttling adjusts a single host's queue depth locally based on detected congestion, but it does not coordinate I/O fairness across multiple hosts sharing the same datastore.
- D. Disk.SchedNumReqOutstanding sets the maximum outstanding I/O requests per datastore per host, which can limit one host's throughput but provides no centralized cross-host arbitration comparable to SIOC.
Concept tested. Storage I/O Control for cross-host I/O contention
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