host isolation question

Similar Questions

• Host isolation response Question

  So, there were a few questions recently in our company on the host isolation response works in vCenter server 4.1.  Given the descriptions on the options available to the virtual machine power on or at the bottom of the current virtual machine, how HA determines that an isolated host is really isolated and running compared to completely failed (offline)?

  Can someone explain in detail a bit more technical that what the VMware article pages kb explain works host isolation response?

  Reading of how insulation host configurations can be defined, if you set the parameters of insulation "leave the virtual machine running", in case of total failure of host (offline) the other cluster hosts not to try the virtual machine online on another host?  And it is recommended to set the response of isolation to "turn off" so that the other hosts in the cluster can bring the virtual machine online?

  I still don't understand how a host can be determined as 'remote' from the 'offline '.  Isolation is simply the communications network have failed and are virtual machine always happily along on the isolated host.  A host simply default and past in offline mode (power failure Physics for example) is a completely different scenario.  Locks are not released correctly (not be able to any type of response of isolation configuration) and the virtual machine is not running on the host offline

  To the HA cluster if communication is lost to a node of the cluster assumes that the node has failed and will be Jean-Marie to restart the virtual machine on nodes in the cluster of rremaining - locks are constantly updated so if the host is not responding is rather isolated that failed he'll again be refreshing locks on the VMDK files. and virtual machines does not start - it is this feature which allows the AP to work - because with what you describe HA would never--work

  In the scenario were the host disconnects and the virtual machine is not running and the response of isolation is set to "leave the virtual machine running" how other hosts in the cluster determin the host is really low?

  The other guests guess always the isolated host is really down and try to restart the VMs - isloated host system is the machine that will follow response of isolation parameters - either the vms on power or powered by letting off the coast

• HA retry time host isolation?

  Suppose the network breaks for some a host and host isolation response is stopped. After 12 seconds he will make his test of isolation, then will launch to stop the virtual machines running on the host.

  Other hosts will detect the host missing after 15 seconds and try to start them. However, because virtual machines very, probably not even to stop the locks on files are in place. Let's say that according to the workload inside the guest, it will take all of 20 seconds to several minutes to make a gradual stop. (I know there is a sunset that goes off after 5 minutes).

  But my question is, how long and how often other hosts will try to restart the VMs system which vmdk files become available one after the other?

  Duncan Epping describes the behavior of the http://www.yellow-bricks.com/2010/06/30/how-does-das-maxvmrestartcount-work/ reboot

  André

• Several Host Isolation

  Imagine a scenario where we had a HA of four nodes cluster spread on a campus with two nodes in one place and two in the other. What would the host isolation response if the network connection between the two sites has been lost?

  If we lose a host then the TI is known to be isolated after 12 years and then failed aftet 15s. If we lose two, however, nobody is isolated and I am assuming that nothing happens.

  Now; Imagine that we have warehouses of data which are all shared, but some are in one site and some are in the other. Guests running on local data warehouses would be unaffected. Guests who are running on data warehouses remote fails. The question is: what will happen to the hosts failed?

  Thank you

  Warren Barnes

  Before you answer this in detail, I want to make sure I'm clear on my assumptions:

  1. There are 4 hosts in the cluster, two on each side of the stretch. If this is the case, then all 4 hosts are primary. (The first 5 guests in any cluster are primary, so you get only secondary when there are 6 or more hosts).

  2 If the network fails between the two sites, storage will be split-brain as well? I guess that Yes, based on one of your comments.

  If, in view of the #1 site hosts A and B, and site #2 a hosts C a D...

  If, after the split between site 1 and 2, and B can still heart rhythm with each other, and C and D can pulse between them then there is no answer tried insulation. Answers insulation kick only in when a host can not with any of the other primitives of the heart rate, and it can also ping the address of isolation (usually the gateway (s)) for networks that host is on.

  So what happens is that A & B site 1 to conclude that C & D at site 2 have failed. And vice versa. A and B will try to power - on the virtual machines that are running on C and D, even for C & D - they will try and power on virtual machines that have been on A and b. Now, because the storage of some virtual machines can be found at site 1 and storage other virtual machines are at site 2, some of the power-ons may fail because the storage is not accessible. But as A & B will attempt to power on the set of the VMS C & D and C & D will attempt to power on the set of virtual machines of A & B (that means that admission control allows all of these power-ons) then each VM will end up under tension correctly on each site 1 or site 2.

  Now for the ugly part - if any of the VMS to site 1 lost their storage in the score, or vice versa, then the vmware-vmx process who represent these virtual machines always operate on one or more hosts on the side of the partition that has lost the storage and there is now a process vmware-vmx representative the same virtual machine running on a host across the partition that has now acquired a lock on this VM. None of this is a problem until the partition joined. This is so the behavior described by Elisha happens - that is to say the virtual machine appears to bounce back between the two hosts until the answer to the question on the lock lost by pointing the VC client directly to the host. And as he pointed out, the question will be auto-répondu by VC to vSphere 4.0 U2 and above.

  -Ron

• The host Isolation response

  Hello

  Can I know what is "host isolation response '.

  Thank you

  Prashant

  In short: ESXi hosts running in a HA cluster communicate with each other by sending heartbeats. If a host does not receive the heartbeat of the other hosts more and also cannot each address isolation it triggers the response of isolation.

  For more information on HA, please take a look at http://www.yellow-bricks.com/vmware-high-availability-deepdiv/

  André

• The host Isolation response / loss of iSCSI connectivity - what if scenario

  The other thread on automatic shutdown made me think at our facility:

  1. when our building lost power, we lose cooling and networking, but remains on our servers/UPS systems, as they are connected to a backup generator.

  2 Yah, so, it's not good, cooling is lost, and the servers are will heat up, then we must begin to stop them until the coolant has been restored.

  Our 2 ESX systems connect to our SAN via iSCSI - with the lost power, the SAN and the ESX servers are no longer speaks, so I turned off our ESX servers, until the coolant has been restored, as no negative consequences on the correct virtual machines?

  With the connection of networking\iSCSI lost between ESX servers and SAN, that State will be our being for most Windows virtual machines?  They're going to be trashed?  Or ESX has some kind of verification in place for this type of ailment?

  In our current situation, what would be the recommended host Isolation response parameter?

  Thanks for any idea,

  Chad

  Our 2 ESX systems connect to our SAN via iSCSI - with the lost power, the SAN and the ESX servers are no longer speaks, so I turned off our ESX servers, until the coolant has been restored, as no negative consequences on the correct virtual machines?

  It shouldn't - but this will depend on all wht that the VM, the operating system and the application were doing at the time of the accident-

  With the connection of networking\iSCSI lost between ESX servers and SAN, that State will be our being for most Windows virtual machines? They're going to be trashed? Or ESX has some kind of verification in place for this type of ailment?

  ESX does not check this condition - from your virtual machines is on the iSCSI SAN you will find crashed.

  If you find this or any other answer useful please consider awarding points marking the answer correct or useful

• Host Isolation response - VM Shutdown / Restart

  Gents,

  I couldn't find answer to my question myself so maybe you can help me.

  Let's say we have cluster HA VSphere 4.1 with the default settings. On hosts loses the connection to the network and all the HA primary agents start 15 sec count down. The host of problem also begins his 15 sec timer and after 12 seconds, it tries to ping the default gateway and does not answer. So he decides that he is isolated. If the network connection is not restored within 15 s primary HA officers decide that host problems failed and try to restart the virtual machines, but they can do VMS files are always locked by host problem which just initiated the process of virtual machine downtime after 15 s time of isolation.

  So my question is how that VMs are restarted then if they are not be restarted the first time? Primary HA officers constantly try to restart on alternate hosts?  They try always to restart virtual machines even if the host of the problem can't stop for 300 s and then power off? This missing part of information is really boring

  Would be very grateful for any useful information.

  http://www.yellow-bricks.com/2010/06/30/How-does-das-maxvmrestartcount-work/

  All this kind of thing is also explained by the way in my next book! Should be available through my blog in a week.

  Duncan

  VMware communities user moderator | VCDX

  -

• vCenter 6 web gui - host isolation response

  Hello

  I was looking at the option of isolation of host and then noticed that he not there no "leave it on" option on vcenter 6 web gui (version 6.0.0 2656761). However, "leave it on" option is still available on the client. As you can see from the screenshots, I chose the option "leave on" on the heavy and used customer "turn off and restart the virtual machines ' option on web gui.

  I really appreciate if someone provides the details to clarify my confusion because I'm not sure what settings will apply in case of isolation of the host.

  
  

  Thank you

  AFAIK the "leave it powered on" in c# client is now called as "Disabled" in the Web Client, which means nothing do, don't react not if the host gets isolated.

  You say that you set the value "leave powered we" in c# client and then when you check the settings for the cluster in the Web Client, it displays "Power Off and restart VM?

  If so, no refreshing or reconnect to the web client result by displaying "Disabled" in the web client?

  I hope this helps.

• HA sensitivity of host isolation

  Hello

  I was wondering if it is configurable to meanings?

  When you test the abduction of a switch of my kernel stack, I found that battery restarted in response, resulting in a failure full of about a minute.  This is why I really need to configure somehow HA to react only after, say, five minutes for the isolation of the host.

  Thank you very much

  As I understand it, das.failuredetectiontime should be what you are looking for.

  See HA Deepdive for more details

  André

• Response of host Isolation and HA

  I was wondering what happens if your cluster 'Response of Isolation host' is set to "leave VM under tension" and you actually have a host fail.  HA will be able to distinguish between a host that is not visible on the network and let these VM under tension and a host that is down and restart these VM elsewhere?

  Thank you

  Yes, a failure of HA, other members can resume the lock that existed prior to the failure of the host for the virtual machine it was running.  In the case of a response of isolation, these locks are not erased, so when other hosts are trying to take over the lock, they are being denied and therefore stay up to the virtual machine and running on the response of isolated, as opposed to the caught locks if the host fails.

  Not the best description and I'm sure I've missed a step or two, but for all purposes, Yes, HA can make a difference between failure and isolation.

  -KjB

• Strange host Networking question

  I have a vmware host in a cluster. The strange thing is that all of a sudden when I go to configuration-> network-> vsphere standard switch, I'm not able to see the VMkernel Port with the IP address assigned to the vmkernel port used to connect to the host to the cluster.

  I have attached two files. screenshot1 comes from other vmware host in the cluster which seems correct that screenshot2 however is the host that is not look right. I can always ping the address which does not appear in the vmkernel port and I can connect to this address using the vsphere client. WTH?

  A help is appreciated.

  Thank you very much

  as you go to the standard switch configuration:

  configuration--> network--> switch vsphere standard

  There you have a tab with distributed switch:

  http://everythingshouldbevirtual.com/wp-content/uploads/2012/07/Create_Distributed_Switch_VMK-Ports_iSCSI.PNG

• Add a PowerShell host workflow question

  Hello people,

  I ran into a problem when I tried to run the add a workflow host Powershell.

  Here's what I've done so now...

  Installed PowerShell plugin in the system of the vCO.

  WinRM service that is configured according to the doc in my vCO server... I want to use the same vCO as a powershell host server too...

  I created the krb5.conf file in the installation of vCO location mentioned in the doc.

  Ran the workflow manage SSL certificates which was a success.

  Now I have to add this as a host of powershell to see in the inventory which fails with the error below.

  Connection timed out: connect (name of the dynamic Script Module: addPowerShellHost #16)

  Your help is very appreciated!

  Kind regards

  VMSavvy

  1. I suggest to add "-a: option of the Kerberos test to connect to the winrm service" This will ensure that the mechanisym of Kerberos authentication is used.

  > winrm identity-r:https:// host_name : port_number -was: Kerberos-sup: user_name Pei:password

  2. try to connect vCO PowerShell plugin using shared session and providing user specifiv credentials (but be sure first that this user has enough privileges to connect to the WinRm service using winrm client)

  > winrm identity-r:https:// host_name : port_number -was: Kerberos-sup: user_name Pei:password

  3. could you give the error reported in vCO?

• Cached host settings question

  Hello

  I have a VMware View 5.1 environment connection to a 5.0 vSphere environment U1.  When you enable the setting host cache Display Configuration > servers > Select VC > caching the host tab and clicked OK, the ESXi hosts are not configured.  This is verified by checking a host ESXi Advanced Configuration > settings of the CBRC .

  Looking at the Connection Manager view logs I see this:

  2012-09 - 12 T 00: 18:42.761 + 10:00 INFO (0 B 00-1498) < ConfigureHostsCbrc-305e9d23-1db4-46c3-a037-d6651414452d-1346994657311 > [Audit] VC_OUTAGE:Url: https://vCenter.Server:443 / sdk
  2012 09-12 T 00:10:00 18:42.761 WARN (0 B 00-1498) VirtualCenter < ConfigureHostsCbrc-305e9d23-1db4-46c3-a037-d6651414452d-1346994657311 > [ServiceConnection25] https://vcenter.server:443 / sdk is currently unavailable - attempt to reconnect
  2012 09-12 T 00: + 10:00 18:44.087 WARN (0 B 00-1498) < ConfigureHostsCbrc-305e9d23-1db4-46c3-a037-d6651414452d-1346994657311 > [ServiceConnection25] problem in VC operation: "Authorization to perform this operation was denied." [com.vmware.vim25.NoPermission]
  2012-09 - 12 T 00: 18:44.088 + 10:00 INFO (0 B 00-1498) < ConfigureHostsCbrc-305e9d23-1db4-46c3-a037-d6651414452d-1346994657311 > [Audit] VC_OUTAGE:Url: https://vCenter.Server:443 / sdk
  2012 09-12 T 00:10:00 18:44.089 WARN (0 B 00-1498) VirtualCenter < ConfigureHostsCbrc-305e9d23-1db4-46c3-a037-d6651414452d-1346994657311 > [ServiceConnection25] https://vcenter.server:443 / sdk is currently unavailable - attempt to reconnect
  2012 09-12 T 00: 18:44.089 + 10:00 WARN attempt reconnection of (0 B 00-1498) previous VC < ConfigureHostsCbrc-305e9d23-1db4-46c3-a037-d6651414452d-1346994657311 > [ServiceConnection25] didn't work, will wait before trying again.
  2012 09-12 T 00:10:00 18:59.090 WARN (0 B 00-1498) < ConfigureHostsCbrc-305e9d23-1db4-46c3-a037-d6651414452d-1346994657311 > [ServiceConnection25] without the permission of Sciez VC.

  The vCenter user account used for display is a Director in VC and together at the level of the VC in accordance with the documentation.  Can anyone suggest why the permission issues could be implemented?  Anyone of you get these messages in newspapers from your view when the deactivation/activation of the feature set cached host?

  See you soon

  gogogo5

  I had similar errors and had to give up my user VC the privilege to change the configuration advanced options for guests.  It's so she can allow the CBRC in advanced settings.

  Host.Config.AdvancedConfig

• Interface of host agent questions more is more recent than the server

  I noticed that my host in Lab Manager is available but not ready state, which means, I can't really do anything.  The error I get is:

  Preparation error

  With interface '5' agent version is newer than the server interface version '2' on the host.

  Any suggestions?

  Thank you!

  This host was used with vCloud Director?

  You cannot prepare and ESX host with LM previously sanded Director of cloud.

  Best regards

  Jon Hemming

• VMware HA problem with isolated host.

  Hello, we have two IBM x 3850 M2 running ESX 3.5 U4 (153875).  Both are attached via NAS (NFS) to an IBM N3600 (Netapp FAS2050C).  Each server has two NETWORK adapter configured on their system console vSwitches (team) and there is an additional private network running for the storage and vMotion (with two NIC of each).

  We have DRS and HA enabled for our cluster with two nodes with the following parameters of HA:

  • Host allowed failures: 1

  • Enable the VMs to be powered even if they violate constraints of availability

  • VM restart priority: medium

  • The host Isolation response: stop the virtual machine

  • Enable VM monitoring (high)

  If I pull the power on one of the hosts, virtual machines are automatically provisioned on the host survivor as expected.  However, if I simulate double NIC failure on one of the hosts by unplugging both the System Console env, we lack in the following behavior:

  1. On the host that has been isolated (prodsys-vm1), the logs indicate that the server has detected it is isolated and begins to shut down its virtual machine.

  2. The host of survivor (prodsys-vm2) notes that prodsys-vm1 disappeared.

  3. prodsys-vm2 saves the VM "isolated" and tries to turn on.  The following error message is observed for each VM has failed:

  [2009-07-24 13:00:17.352 'vm:/vmfs/volumes/2e5dc29c-712e74ba/Test System/Test System.vmx' 3076461472 info] Question info: Cannot open the disk '/vmfs/volumes/2e5dc29c-712e74ba/Test System/Test System.vmdk' or one of the snapshot disks it depends on.
  Reason: Device or resource busy., Id: 0 : Type : 2, Default: 0, Number of options: 1
  [2009-07-24 13:00:17.352 'BaseLibs' 21044144 info] Disconnect check in progress: /vmfs/volumes/2e5dc29c-712e74ba/Test System/Test System.vmx
  [2009-07-24 13:00:17.367 'ha-eventmgr' 3076461472 info] Event 82 : Message on Test System on prodsys-vm2.esri.com in ha-datacenter: Cannot open the disk '/vmfs/volumes/2e5dc29c-712e74ba/Test System/Test System.vmdk' or one of the snapshot disks it depends on.
  Reason: Device or resource busy.
  

  1. prodsys-vm2 then unregisters each virtual computer.

  2. Wait several minutes, but no other attempts are made to register and/or marketing the virtual machine failed.

  3. Now, if I register manually an of from the prodsys-vm2 failed VM console, it is immediately and without further interaction with me under tension.  In addition, this seems to trigger the re-registration of VM chess which is then subsequently automatically switched on without error.

  The obvious conclusion here is that prodsys-vm2 does not prodsys-vm1 enough time to stop the virtual machine before trying to restart.  I imagine that this could potentially be adjusted by getting the das.failuredetectiontime (I see a recommendation of the 1960s).

  A few questions though:

  • Why don't prodsys-vm2 try again to register and start the virtual machine failed after the first attempt?

  • Why when I joined one manually it suddenly decided to register and start up of the rest on its own?

  • Is it possible to keep my time failuredetection low (for faster recovery) and still be able to avoid this situation?  I could see a situation where maybe even 60s would be high enough.  It seems that this should be handled with more elegance that just get a time-out value...

  Of course, there are some fixes that might apply to our facilities and those who can give a try.  Will also lift it in support, but hoping someone out there might have some ideas.

  Thank you!

  Sorry,

  I forgot the second half of this message:

  VMware High Availability (HA)

  Virtual Machines using a NFS data store could fail after an HA failover event

  When you have the overcommitment of memory with virtual machines on a NFS datastore, it creates a vswp file, which is a size swap file non-zero. In this scenario if HA failover events occur and the AP are defined on THAT VM leave power on, you may have a failure of virtual machine on the host where the virtual machine was originally executed before the HA event.

  If you don't have an overcommitment of memory with virtual machines on a datastore NFS, so HA failover events occur with the parameter THAT VM leave it turned on, in addition to the migration of the virtual machine running on the original host may fail.

  Solution: Apply Patch ESX350-200905401-BG to ESX Server 3.5 and hosts Patch ESXe350-200905401-I-BG of ESX Server 3i version 3.5 host computers.

  When a Virtual Machine running on a NAS data store is configured to be stopped or left turned on in response to the isolation of the host, the Virtual Machine may attempt to run simultaneously on two hosts an event of network isolation

  Multiple network that causes failure host isolation and loss of access to the network for the data store, if a virtual machine is configured with the setting stop VM or VM leave it turned on in case of isolation of the host, the virtual machine may not respond indefinitely. As HA tries to turn off the virtual machine and restart on another host, two instances of the virtual machine may appear in the VI Client. There is no data corruption, because HA and VMFS properly control access to the data of the virtual machine, but the original virtual machine becomes inadmissible. After access to the data store is restored on the isolated host, the original virtual machine can be manually powered down.

  Solution: In environments NFS or iSCSI, select power off the virtual machine as the response of virtual machine in a cluster by default if a host is isolated.