Slot size in vmware
Dec 09, · By Duncan Epping, Principal Architect, VMware Yesterday I received a question on twitter: Hi, to settle an argument in the office, if no reserves are in place, does number of vCPU’s affect slot size in vSphere 4? This has always been a hot topic, HA and Slot sizes/Admission Control. One of the most extensive (Non-VMware) articles is by Chad Sakac aka Virtual Geek, but of course since then a couple of things has changed. VMware slot sizes are an important topic if you’re concerned with how many ESXi hosts are required to run your environment. What is a Slot? To begin this post, we need to understand what a slot is.
HA and Slot sizes
The maximum number of slots that each host can support is then determined. Then we divide the total available CPU resources of a host by the CPU slot size and the total available Memory Resources of a host by the memory slot size. However, esx05 will have slots available. Go to original post. Please enter a title.
vSphere HA Slot Size and Admission Control
To begin this post, we need to understand what a slot is. Slot size is an important concept because it affects admission control. A VMware ESXi cluster needs a way to determine how many resources need to be available in the event of a host failure. This slot calculation gives the cluster a way to reserve the right amount of resources.
The slot has two parts, the CPU component and the memory component. Each of them has its own calculation. In the example below we have 2 ESXi hosts that have the same amount of resources available for virtual machines. There are different sized VMs, but none of them have a reservation. Doing a quick calculation we can determine that slots are available on each host. So therefore we could safely start machines on these ESXi hosts, have one fail, and have the other host start all of them.
That would be a great consolidation ratio. What if you have a single large VM with a reservation, but the rest of the virtual machines are relatively small. Admission control is going to tell us that only 6 slots are available on host B, so it will only allow 6 VMs on host A to be powered on. Note that if you do this, some of your VMs will require multiple slots to run. For instance the large VM we used in our example might take more than 1 slot depending on what size you make it.
The button below the slot size configuration may help you determine how many VMs will be affected by this change. There will be an item listed for slot size. Do you want more information on the subject? It looks like I might have had a calculation wrong there. Thank you for the question. Notify me of follow-up comments by email. Notify me of new posts by email. What is a Slot? How are Slots Sized? Problem Scenario What if you have a single large VM with a reservation, but the rest of the virtual machines are relatively small.
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You can configure vSphere HA to tolerate a specified number of host failures. With the Host Failures Cluster Tolerates admission control policy, vSphere HA ensures that a specified number of hosts can fail and sufficient resources remain in the cluster to fail over all the virtual machines from those hosts. Calculates the slot size. A slot is a logical representation of memory and CPU resources. By default, it is sized to satisfy the requirements for any powered-on virtual machine in the cluster.
Determines how many slots each host in the cluster can hold. Determines the Current Failover Capacity of the cluster. This is the number of hosts that can fail and still leave enough slots to satisfy all of the powered-on virtual machines. If it is, admission control disallows the operation. Slot size is comprised of two components, CPU and memory. If you have not specified a CPU reservation for a virtual machine, it is assigned a default value of 32MHz.
You can change this value by using the das. There is no default value for the memory reservation. If your cluster contains any virtual machines that have much larger reservations than the others, they will distort slot size calculation. To avoid this, you can specify an upper bound for the CPU or memory component of the slot size by using the das. After the slot size is calculated, vSphere HA determines each host's CPU and memory resources that are available for virtual machines.
These amounts are those contained in the host's root resource pool, not the total physical resources of the host. The resource data for a host that is used by vSphere HA can be found by using the vSphere Client to connect to the host directly, and then navigating to the Resource tab for the host.
If all hosts in your cluster are the same, this data can be obtained by dividing the cluster-level figures by the number of hosts. Resources being used for virtualization purposes are not included. Only hosts that are connected, not in maintenance mode, and that have no vSphere HA errors are considered.
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