Explanation for vmmemctl.sys:
Memory ballooning function is not related to shared/reserved setting in vmware properties.
Memory ballooning is handled through a driver (vmmemctl.sys) that is installed as part of the VMware Tools.
This driver is loaded in the guest OS to interact with the VMkernel and is leveraged to reclaim memory pages when ESX memory resources are in demand and available physical pages cannot meet. requirements.
When memory demands rise on the ESX host, the VMkernel will instruct the balloon driver to "inflate" and consume memory in the running guest OS,
forcing the guest operating system to leverage its own native memory management techniques to handle changing conditions.
Free pages are typically released first, but the guest OS may decide to page some memory out to its pagefile on the virtual disk.
The reclaimed memory is then used by ESX to satisfy memory demands of other running workloads, but will be relinquished back to the guest OS when memory demands decrease by "deflating" the balloon driver.
Balloon driver activity can be viewed either through VirtualCenter performance monitoring graphs or ESXTOP on the local host.
From the explanation, it is clear now that during issue period, memory exhausted on ESX global server, hence it grabs memory from guest OS namely our DB server.
Below are the steps to check the ballooning from ESX host:
Below are steps to disable memory balloon:
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