Admission control - [Sanity Check] cluster asymmetric w / no reservations of VM

Similar Questions

• 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

• How can I reference the properties of a control in a cluster in an array of clusters?

  Hello

  I am a newbie of Labview, so any advice is welcome on any code posted here.

  I have one "tick" test VI where the operator is required to boxes that are then "signed". Once all the boxes are signed correctly, the operator indicates that they are finished to enter data and VI requires that a "representative" ticks boxes same as the operator, even once be "signed." I created a "list item" control that contains a set of a string for the description of the check list, a Boolean control object and string for the operator 'tick' and 'signature' and a Boolean control and chain for the Authoriser "tick" and signature. This control is then initialized in a table to create however many controls are required (currently 10), make a table of the clusters. See the jpg for the front panel to clarify this point.

  In the cluster of list control item I want to have the 'case' Authoriser and 'signature' stay disabled and grayed out until such time as the Authoriser is validated (currently scan barcodes), how I want to activate these boxes for the entry clearance officer. I can not reference the two controls in the cluster of element control list in order to be able to change their property to disabled. I'm not implicitly reference the control. I seem to be able to access the array (i.e. a list item control) in reference, but not the controls element in this cluster of list item, this code is shown in "cluster in an array.jpg Reference.

  I turn round in circles for some time now, so any help would be appreciated.

  Concerning

  Ray

  There are two ways to get a reference to an element in a cluster, in a table. The first way to begin with a reference to the whole table and deconstruct it. It's a pain. The easiest is to right-click on the item in the cluster, and then in the submenu to create reference. LV will switch to the block diagram, and you will notice that the cursor will hold a reference to the thing you clicked on. The third way to follow ("... no one expects the Spanish Inquisition... ") is in the create submenu, select the property node, then select the property you want.

  Mike...

• HA Admission Control and DPM with clusters with 3 and 2 guests

  Hello world

  I have two clusters, with 3 hosts first and second with 2 hosts. And I have a few questions about the activation of DPM:

  1. 3 HA/DRS cluster hosts, I activated the admission control to the percentage of cluster resources reserved as failover alternative DART at 33%. Because I have no VM on this cluster, when I enabled DPM he put 2 hosts in standby mode. And now when I powered on any virtual machine on this cluster I get error "the operation is not allowed in the current state. It is possible that when I disable the admission control - but then I lose protection HA. So in Group 3 knots I would always have 2 guests under tension when strict admission control VMware HA is enabled? It is possible that if in DPM options I disabled power on 2 hosts management. Am I wrong? And DPM set power switch my third host (for example brings leaves host standby mode to keep the needs of failover)?
  2. Cluster of 2 guests when I activate CAC (50%) Should I disable DMP, because I still have 2 powered on the hosts?

  1 HA/DRS + DPM you 1 single host standby because HA need 2 host be powered.

  2. no DPM in two Cluster nodes if HA is enabled.

• vSphere 5.5 HA percentage based Admission Control Policy

  I wanted to light for some time, and it is better described by a scenario.

  1. I have a 2 host cluster, to make it easy, each host is configured with 32 GB of physical memory

  2. the cluster is configured with Admission Control activated, and the policy is set to percentage of the cluster resources CPU 50% / 50% memory with the idea of reserving half of the ability to support a 1 server failure.

  3. for the sake of argument, let's say there are 10 servers in the cluster, NONE of these servers are using any type of booking for CPU / MEM.

  4. each of these 10 servers is configured for 6 GB memory (6 GB x 10 VM = 60 GB memory affected). For the sake of the argument lets say DRS distributes 5 virtual machines per host, 30 GB per host.

  5. now, in my opinion, Cluster, each of my guests show a % 93% memory used, I have alarms jump in vCenter shouting that memory is low.

  6. Since none of these virtual machines run reservations (cut the CPU and memory) switch on the percentage of capacity. Those numbers are hardly showing a tooth due to default reserves applied, (what happens as 32 Mhz?) Readings for the current ability to failover cluster CPU and memory switch are 98% CPU, memory of 99%. Well above the 50% necessary for CAC to kick in and say STOP FEEDING ON VMs!

  Now that I put on the Foundation, we have allocated 60 on the 64 GB of physical memory to virtual machines and vSphere alarms are declaring 'hey you're Out of memory', however, by using a product such as VeeamOne, he pointed out that each of these 10 VMs are really using only 2 GB memory physical host the 6 GB allocated. If "technically", we are only using 20 GB (10 GB/host) of 64 GB of memory available to the cluster host physical.

  The million dollar question is... if I'm not one of the hosts, all THE virtual machines will come online on the last surviving node?

  Scenario 1:

  Host 1 32 GB of physical memory, 5 VMs, 30 GB of allocated memory, alarms to use 93%

  Host alarms 2 32 GB of physical memory, 5, VMs, 30 GB memory allocated, 93% of use

  1 host fails, HA intervenes, it goes to the State, it cannot power on virtual machines more because it is only 2 remaining GB and I need power over 30 GB of value? (I expect that this is not the case, we should be able to provision...)

  Scenario 2:

  1 32 GB of physical memory to the host, 5 VMs, 30 GB of memory allocated, physical 10 GB used by Veam reported, physical of 20 GB remaining

  The host of 2 32 GB of physical memory, 5, VMs, 30 GB of memory allocated, physical 10 GB used by Veeam one reports, physical of 20 GB remaining

  Welcome 1 fails, HA comes into play, it starts every 5 VMs on host 2 because it has 20 GB remaining physical and needs only 10 GB?

  It seems that there should be a better way to really tell if you can fully support 1 node failure model % with the memory allocated in your cluster-based, anyone can demystify it for me and explain?

  There are several measures that serve to plan capacity. For the record, good or bad, I look at demand and active memory. Also, if I see the balloon flight or in Exchange, I feel its time to add a host (or just memory... it all depends on several other measures). DRS is starting to complain when the hosts are stressed. Right resize VMs from the beginning makes it easier trend and plan additional abilities. There should be no need more allocate as much.

  I also use VROPS in my environment. This is very useful for trends and plan ahead.

• HA admission control - power on a virtual machine with no available slots?

  Hello world

  Is it possible this admission control would allow a machine virtual can be powered on when there is no available slots?  I don't speak HA initiate a failover, but manually power on a virtual machine of the vSphere client...

  My current settings of the laboratory are:

  -vCSA 5.5

  -5 x test VMs

  -3 guests x ESXi 5.5 with 2 processors and 4 GB of RAM each.

  -Admission control policy = host failures tolerates the cluster = 1

  -Fixed CPU slot size = 2000 MHZ (yes I know it is huge, but I am doing this to force a slot by ESX host since resources 'hidden' PR of each host ESXi brings only 3800 MHZ)

  -Then, the slot machines, 2 3 total used, 1 failover, with 2 under voltage VM.

  It is my understanding that once you run out of slots, admission control should leave you not MANUALLY power on the new virtual machines. I could do something wrong, but in my case, I am able to power on the other 2 VMS with 0 slots available. I enclose some screenshots for reference.

  Could I be missing?

  Thanks in advance.

  So this should be no possible and looks like a bug to me. Please file a support call and post the number SR here so that we can have genius watch.

• 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:
  -2 x Dell PowerEdge R720s with 96 GB of memory and 2 x Intel Xeon CPUs E5-2650 (12 cores) per host
  -ESXi 5.0 Update 1 + the latest patches
  -vSphere active HA
  -Admission Control Enabled (set at 50% of the resources of the reserve)
  -Active DRS
  -16 VMs Windows with the configuration of the CPU from 1 to 4 vCPUs and 1 GB to 4 GB of memory.

  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:

  (1) the calculator attached that I would be very grateful if someone would review and confirm that it is correct (I hope it is and others will find it useful). I protected the leaves 'CPU' and 'Memory' so they can be used as examples. Just edit the details of CPU/memory host in other sheets to match your environment. I've left the details of my cluster in there I thought that people might use it as an example. If you like I can clean up towards the top.

  (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

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

  Hello

  I'm looking for a Cli Script to get out information for HA, political admission control and the level of the DRS for each Cluster in the CSV format with the name of the Cluster

  (1) it must be HA information, they are handicapped his license, for each Cluster in vcenter.

  Admission control 2) enabled or disabled.

  (3) policy admission policy admission control type speciying control

  (4) DRS Automation level as manual, partially automated and fully automated.

  Need this info to keep track so we have several Cluster

  Thank you

  vmguy

  If you want to select only the groups whose name starts with Cluster, you can then change the command Get-Cluster in the first line of the script in:

  Get-Cluster-name Cluster *.

• HA Admission Control Policy - slot sizes

  Hello

  I just want to ask everyone on the Slot sizes in HA.

  Somehow, I understand that slot sizes are determined with the underlying physical servers and the allocation of resources to virtual machines or reservation (as appropriate). But according to the comment, I noticed sometimes the 'differences' specifically in the Slots of Cluster Total, used and available places.

  Total number of connectors Cluster is not always equivalent to the sum used and available places. It may be more or less at the same time.

  Can someone explain it to me more detail? Appreciate your help on this. TIA!

  In this particular case, could it have been that HA was later activated on a cluster who suffered many virtual machines power? Or maybe the virtual machines have been powered when admission control has been disabled, then admission control has been activated again? That would be wise.

  Scott.

  -

• 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

• What control in a cluster has been responsible for a MouseDown event?

  Hello

  I have a cluster with lots of controls and one for the event can be triggered from a MouseDown event generated by the cluster. How to know which control generated the event?

  In a similar problem with a ValueChange event I use oldval and newval compare what control has changed, but I can't do with MouseDown.

  Any ideas?

  Lauri

  Lauri,

  the reason why you do not get an information control within the cluster has been clicked is simple:

  The event is not a control within the cluster, but on the cluster itself. So if you click on the "white" of the bunch, the event also fires...

  The best solution for your application needs to manage a click on the cluster, but on the elements of a cluster. The event should look like this:

  

  The same is btw. true also for change of value if you don't want to do things to compare...

  hope this helps,

  Norbert

• How to find all the Subvi value changes to a control inside a cluster?

  I have a question I've had brewing for many years now, and as of today, this issue has become less philosophical for me now that I have a VI project with hundreds of screws in there to work through... If I have a cluster which is passed between/through several subVIs, is there a way to find all reads/writes to a particular control within this cluster? For example, if I use a global variable, I can find all the instances where this variable has been changed. Several times, a cluster is used to pass data instead of lots of global variables, but I know not anyway quickly find where specific parts of the latter are read or written in subVIs. Global variables becomes a headache when they are too many of them fly around, but I can't keep track of reads/writes in bunches without manually looking through a few screws hundreds that take in the cluster. Is there a function for this that I'm not aware of? I hope that this question/problem of logic. This may prompt a discussion of architecture, which I would be happy, because I will need to build projects of this scale in the future, but I think also completely stuck when the clusters are used (by me or others) to pass data autour. Thank you! John

  If you ungroup by name and bundle by name, just do a search for text to the name of the control.

• Node property of a control inside the cluster within a table

  I created a control that has a cluster to a Boolean, a string, and a digital.  Then, in my front, I created a table of these custom controls.  I wish I had access to the property of the controls inside the cluster in the table.  That is to say, I want to change the color of the Boolean or blinking, or "disable and gray" text box.  I think I'm on the right track, or maybe I'm on the wrong track.  I joined and example VI (testtray.vi) and control that I use (UUT_Display.ctl).  Please excuse the use of a flat Structure of the sequence, I know it is bad programming practices, but I just wanted to throw something together.

  Any help would be appreciated.

  Kevin

  Items in a table can have different values, BUT each element of the table share the same properties.

  "Blink" is a property when you make one in tha table blink you will all Flash.

  This restriction does not apply to clusters.

  So in theory, you could develop an XControl that has a data type is an array, but the display is actually a cluster that resembles a table. But write an XControl is not a trivial task.

  Ben

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

  I expect a scenario when vcenter is down and in the meantime ESXi host is harnessed. How this admission control will be coming in this scenario? It will restart the virtual machines without taking into account the policy of admission control? or how? I don't know how information moves from vcenter for HA.

  Can anyone help me please with this. Thank you very much.

  Thanks much for the reply. Thus, admission control information will be with the guests? where this information is stored inside the host, we can see that or we can change it from the host?