Discussion
Assertion (A): A very write intensive virtual machine can be difficult to migrate live.
Reason (R): It dirties memory pages faster than the iterative copy can transfer them.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the mechanism. Each iterative pass must transfer the pages dirtied during the previous one, so convergence requires the dirty rate to fall below the transfer rate. A guest writing memory faster than the link can carry never converges, and the migration either stalls indefinitely or must be forced with a long pause. Throttling the guest’s CPU is the usual remedy.
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