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VMware vSphere High Availability Q/A – Collabnix
VMware HA Slot is the default admission control option prior to vSphere 6.5. Slot Size is defined as the memory and CPU resources that satisfy the reservation requirements for any powered-on virtual machines in the HA cluster.This article is just to cover how the HA slots are calculated step by step not more than that. A question about slot sizes... - VMware vSphere Blog However, vCPUs can have an impact on your slot… it can have an impact on your memory slotsize. If no reservation is set anywhere HA will use the highest Memory Overhead in your cluster as the slot size for memory. This is where the amount of vCPUs come in to play, the more vCPUs you add to a virtual machine the higher will your memory ... HA and Slot sizes - Yellow Bricks HA uses the highest CPU reservation of any given VM and the highest memory reservation of any given VM. If VM1 has 2GHZ and 1024GB reserved and VM2 has 1GHZ and 2048GB reserved the slot size for memory will be 2048MB+memory overhead and the slot size for CPU will be 2GHZ. Now how does HA calculate how many slots are available per host? VMware Slot Size - The IT Hollow Memory Component: 49 GBs / 80 MBs = 627 slots . We take the lower value between the CPU slot size and the memory slot size to determine the number of virtual machines that can be started up under admission control. So therefore we could safely start 384 machines on these ESXi hosts, have one fail, and have the other host start all of them.
VMware HA Admission Control and VM reservations ...
The CPU slot resource is the host CPU resource amount divided by the CPU component of the slot size; the result is rounded down. HA makes the same calculation for host memory resource amount. HA compares the results; the lower of the two numbers is the host slot capacity. Determine the current failover capacity of the cluster. How to Create a Custom Slot Size Configuration To calculate the slot size for a cluster, HA uses the highest CPU reservation of any virtual in the cluster, and the highest memory reservation for any virtual machine in the cluster. If no reservations are set then CPU will be set as 32 Mhz (see screenshot above) and memory will be set as 0MB + the memory overhead.
If you have the VM configured with the highest memory reservation of 8192 MB (8 GB) and highest CPU reservation of 4096 MHZ. among the other VM’s in the cluster, then the slot size for memory is 8192 MB and slot size for CPU is 4096 MHZ. in the cluster. If no VM level reservation is configured ,...
Q.35136: How does vSphere High Availability calculate t How does vSphere High Availability calculate the memory slot size of a virtual machine? A. Virtual machine memory reservation + overhead of largest virtual machine. B. Virtual machine memory reservation – overhead of largest virtual machine C. Virtual machine memory reservation + overhead of smallest virtual machine D. vSphere 6.5: HA & DRS improvements. Part I | StarWind Blog A number of improvements that have been introduced in vSphere HA and DRS in the last several years are impressive. vSphere 6.5 continues this tradition by bringing new features into HA Admission Control, by adding flexibility with HA Orchestrated Restart and by enabling DRS to make more intelligent ... VMWare HA Slots Calculation - LINUX AND VMWARE STUFF If no VM level reservation is configured , Minimum CPU size of 256 MHZ and memory size of 0 MB + VM memory overhead will be considered as CPU and Memory slot size. Calculation for Number of Slots in cluster :-Once we got the Slot size for memory and CPU by the above method , Use the below calculation
Create a custom slot size configuration. By default HA will take the largest CPU and memory reservation of virtual machines in a cluster to determine Slot size for the cluster/hosts. But we can force HA to use user defined value of CPU and memory to calculate slot size.
Now I understand that Vmware takes the largest VM running, and uses this to calculate the slot size, that being said, is it assuming ALL VM's are basically using the same resources that the largest VM is taking up? Is it to my benefits to create a custom slot size? and if so what's the best method to do so? VMware HA Admission Control and VM reservations ... If you’re asking why the 81% and not a full 100%, those 19% are lost on VM memory overhead. But it might be clear that I can’t power on another 81% of 24GB = 19GB of VMs and still have 25% spare HA failover capacity. For details on how the calculations are made, check Duncan’s VMware HA DeepDive Guide, a must read. Effects of DSVA with reserved memory on VMware HA ... Memory: 0MB + memory overhead; HA slots with no memory reservation on a VM: HA slots with 2048MB memory reservation on a VM: The number of HA slots available in the cluster is affected because the DSVA has reserved memory. You may consider using the HA advance attribute das.slotmeminmb to override the memory slot size.
How to use VMware High Availability: A VMware HA guide