but if you want to do that, you can do it via the vSphere Client setting (Remove entry from. Do Not disable Balloon Driver, because it's the best intelligent memory reclamat ion technique. Also, reserved memory is protected against memory reclaiming, even contention happened.Ĥ. Use Resource Pools, especially in cluster-level and reserved estimated memory for mission-critical application and high resource-demand VMs and ensure they access to enough resources. It's recommended to provision equal memory for all of ESXi hosts.ģ. Use VMware DRS in cluster-level resources to distribute VMs between hosts and balance resource usage, then no need to worried about low-memory. Estimate carefully about overall required memory and also provide at least 25% more memory in the design phase.Ģ. Remember, ESXi Host's memory will stay in share state until total required memory for them (memory requests) is greater than available physical memory (over-commitment), So if we want to prevent this situation before ballooning activation, we need to do these jobs:ġ. (I will discus more about it later on another post)
There is one crucial point: If Memory Compression could happen, there is no need for hypervisor swap procedure execution. although swapping is a reliable way against memory over-commitment, but it may cause total performance degrading because the efficiency of generated swap files is highly depended on IOPS rate of datastore specified for swapping, So if we don't provision suitable Disks (Like SSD) for swap files, it can lead to low performance. Host Swapping (or vRAM) has occurred If the host has less than 2% free memory and needs to provide more memory resources for memory-intensive VMs, so hypervisors should have enough swap space.
Host Swapping is another mechanism used in low memory status, but unlike the Ballooning, it does not relate to VM guest OS.
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