Which mechanism allows a VM to automatically increase or decrease its RAM allocation based on demand?

Which mechanism allows a VM to automatically increase or decrease its RAM allocation based on demand?

• A. Dynamic RAM
• B. Static RAM
• C. Memory Ballooning
• D. Swap Space

Answer: (A)

Dynamic RAM is the mechanism that lets a hypervisor adjust a VM’s memory on the fly in response to workload. When demand increases, the host can allocate more RAM to the VM; when demand decreases, memory can be released back. This automatic scaling keeps performance up during spikes while improving resource utilization overall. Memory ballooning is a technique used to reclaim unused memory from a VM to support this dynamic behavior, but the essential concept is the ability to grow or shrink RAM automatically. Static RAM would be fixed, and swap space is a disk-based fallback that doesn’t provide automatic RAM scaling.

Dynamic RAM is the mechanism that lets a hypervisor adjust a VM’s memory on the fly in response to workload. When demand increases, the host can allocate more RAM to the VM; when demand decreases, memory can be released back. This automatic scaling keeps performance up during spikes while improving resource utilization overall. Memory ballooning is a technique used to reclaim unused memory from a VM to support this dynamic behavior, but the essential concept is the ability to grow or shrink RAM automatically. Static RAM would be fixed, and swap space is a disk-based fallback that doesn’t provide automatic RAM scaling.