How is admission control information is pass on host when vcenter is out of service?

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• HA admission control, no reservation

  Hi all

  I read trying to get my head around how HA admission control works with virtual machines that have no defined reserves.

  My understanding is that the HA system assigns a default value of 256 Mhz CPU and 0MB + of memory overload VM who do not have reserved resources. This default value would be the size of the slot to determine the amount of the VM, the cluster can run.  The number of places is in turn affected by the number of host failures that can be tolerated or the percentage of resources as production capacity unused failover.

  Where I am confused, this is what happens when HA assigns (assuming that no reserve of VM) default slot size (256 Mhz + (0 MBoverheadMB) to a cluster when the VM memory usage is greater than 0 MBoverhead?)  I guess that there is a possibility that HA slot allocation could exceed by far the cluster resources real/usable in the event of failover/maintenance etc. mode

  For example -.

  A cluster using host to 32 GB with a bunch of 1vcpu 4 GB VM without reservations the value.  According to the guide of resources each VM would have an overhead of 165.98 MB, resulting in a fairly large number of slots for each host.  Assuming that the CPU resources are sufficient, a host might have something like 190 slot machines to play with.

  Does this mean that HA would allow 190 4 GB without reserve in the cluster VM before that admission control would still prevent or add power on VM?  If this is correct, it seems quite possible more than commit the very much, defeating the point of assignment of a host for failover or the percentage of resources etc. as each host in the cluster could be running over 100% of use of.

  Assuming that all virtual machines must stay without reservation, how could configure HA of follow-up admission control admissions (chess hosts or percentage) without saturating the remaining hosts?

  EDIT - this link summarizes my question a little more eloquently that I could put it, note the linked article is 2008 and the figures may be out of date.

  http://vinternals.com/2008/12/ha-slot-size-calculations-in-the-absence-of-resource-reservations/

  See you soon.

  link added

  As shown in the link you posted (and guide availability VMware page 26 - http://www.vmware.com/pdf/vsphere4/r41/vsp_41_availability.pdf) HA admission control uses to determine the size of the slot if no reserve is specified on the virtual machines, you can use HA advanced options to increase the default values: das.vmMemoryMinMB and das.vmCpuMinMHz. This will increase the size of the slot and reduce the number of places available in the cluster.

  Elisha

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• Need a Script to extract information for HA, DRS levels and admission control policy.

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• vSphere HA Admission Control Calculator

  Hello world

  Today, I tried to place a host in maintenance mode and received the infamous "insufficient resources to meet the level of failover configured for vSphere HA. I worked around this by temporarily disabling the control of Admission, but it got me wondering how the cluster would tolerate the loss of one of the hosts.

  This is what looks like my cluster:
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  I have studied this to try to determine what the cause of the problem. To do this I have set up a calculator based on Excel to determine the capacity of cluster failover. Calculations are based page 22 of «vSphere availability - ESXi 5.0»

  My ad has two parts to it:

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  (2) a question: how will my cluster behave with the loss of a single host? If the behavior of a host in maintenance mode is something to go by not all virtual machines will begin on the hosts of the survivors that the processor requirements cannot be met. However, I read that in an event of failover HA will ignore the policy of admission control and try to start the virtual machines on the host of the survivor. Someone can it confirm please?

  I hope this is clear enough. If this isn't the case, I'll be happy to provide any additional information.

  Thank you very much!

  Sean

  Post edited by: STK2. Spelling, grammar correction. Deleted Excel document (will provide doc updated in a separate answer).

  HA admission control uses the reserves of cpu and memory for the virtual machines, not the configured and memory, the computation of the failover capabilities. You use probably the latter in your calculations. Under the tab "Resources" of the pole in order to see the reservations on your virtual machines (by default, they are 0).

  Elisha

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• HA matter of admission control

  It will probably seem like a silly question.  I'm trying to set the parameters on a HA Cluster in vSphere 5.5.  We have a minimal implementation of vSphere: a site, a single cluster, 3 guests.  We have now 5 virtual machines and would accommodate no more than 12 at any time, (I doubt that we will find ourselves with more than 9).

  We use the option of admission control to use a "percentage of unused reserved production capacity as cluster resources in failover.  I'm trying to define that it tolerates more than one host being down at one point, or in other words, there must be at least 2 of the 3 hosts running at all times.  I should probably select 'Failures that tolerates the home hub' and set it to 1.  But I read in a document on the subject (as the percentage option) was desirable for performance reasons.  But this is what confuses me.  To indicate to the cluster to tolerate up to a failure of the host, should I choose 66% or 33%?  That is the question.  I read a lot of literature, but I can't seem to find an answer to this simple question.  Below in the image, I have made an assumption and set it to 66%.  A single document I've read has explained that I would have guessed that it is 33%, but then I noticed that with all 3 hosts in normal operation, the ability to failover is 99%, and we want that it tolerates up to a failure of the host who would put at 66%.  So if I go by the percentage and want to allow the failure of a host to most, is this (66%) the correct setting?

  

  Thank you, very much!

  Sam L. flow

  Hi Sam,

  Welcome to the forums! With percentage based on admission control policy you choose how your cluster resources, you want to book for use in a failover, so for your scenario where you have 3 guests and want to tolerate 1 fault of the host you would set them to 34% (round).

  Keep in mind with this policy to control intake that counts against the % of cluster resources is: overload of virtual machine (CPU & Mem required by host/ESXi to run the virtual machine) + and a reservation for the virtual machine. This is because the admission control only guarantees that your VMs will restart, not that they will perform well.

  Hope that answers your question. If you are interested in reading more about HA I recommend:

  http://www.yellow-bricks.com/

  http://frankdenneman.nl/

  Amazon.com: VMware vSphere 5.1 Clustering Deepdive eBook: Duncan Epping, Frank Denneman: Kindle Store

  See you soon!

• Admission control and wrap a reservation

  Dear guys,

  as long as I do not have a reservation to my res stocks (with limits) I find it really hard to check how many slots is used if I select "chess tolerate the host cluster" admission control.

  Normally slots are based on VM reserve, but what about reservation assigned to ResPools?

  Then I check the Runtime Info on my group and I do not clearly have some values:

  Subtotal in the cluster = > ok

  used slots = > ok

  places available = > what does mean?

  failover slots = > what does mean?

  For these 2 values, I went to vmware documentation, but it wasn't clear to me...

  Thanks in advance.

  Daniele

  I tested it slots is based on the vm not the Resource Pool reserve reservation

  Example: -.

  Number of slots total = 22

  Used machines slot = 4 (depending on the number of running virtual machine)

  Available places = 7

  Failover = 11 Slots (depends on how many hosts failure cluster can tolerate) if it is 1 and we have 2 node cluster, then this is 50% of the total number of connectors. Means, that you can use according to this example, you can feed only on VM 11 are now no more than that.

  If we don't do not tell me it please

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