Response of Isolation always das.failuredetectiontime - 1?

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• HA response of Isolation with VSANs

  Hi everyone, I hope that someone can offer some advice on that.

  I am new to vSAN, but try to get a few together for HA clusters design decisions in a vSAN environment. Our environment (in short0 looks like this:)

  • 8-node cluster
  • All nodes have storage and participate in the vSAN
  • n + 1 resilience required
  • HA/DRS required
  • Double, 10 GbE NIC will be used for all traffic (with the NIOC shares configured for QoS)
  • VMFS datastore (shared between all hosts) will be used for templates, ISO etc.

  
  It is, I'm a little on some aspects of the response of isolation. There are a few good articles out there, and I would say that I understand 80-90% of it. In our scenario, if a host had become isolated, then HA heartbeats (via the network of vSAN) would fail and the response of isolation would be triggered, it's very well (in our scenario off power / stop I guess that would be the best option that VM would have lost all network access too).

  It is, how having a data store available to all VMFS the cluster hosts (that HA re for heartbeat data store) changing the decision for which use of response of insulation?

  In addition, if there is, say, two guests who become partitioned form the other hosts in the cluster, the response of isolation would not be triggered by these two hosts because they simply elect a new master and continue to operate (as well as the virtual machines running on the host). However, other hosts (say 6 of them) who are now in their own partition can not see the other two hosts and they start the answer HA (restarting the virtual machine of the other two hosts). What strategy must be in place to deal with this?

  Thanks in advance.

  Andy

  Hi there, good question. Let go on it.

  It is, how having a data store available to all VMFS the cluster hosts (that HA re for heartbeat data store) changing the decision for which use of response of insulation?

  This will not affect the decision to define the response of isolation. It looks differently, when the VSAN network doesn't have the host cannot access the components of the affected objects any longer. This means that virtual machines that are running on the host computer that is isolated just lost connection with their storage. If the connection is lost with the storage more often then the virtual computers running it will be useless. Even if you add the data warehouses of heartbeat that it does not change the fact that these virtual machines are not able to connect to the storage system. Whatever it is, I'd always go for "turn off". That way when isolation is lifted the 'remote' VM has already gone.

  For a partition, it's different. There is no "response of partition" that you can set. So if there is a partition, then the partition that owns > 50% of the components will get the property of the object, the other side will lose the property. And then the virtual machine can be restarted... but he will not be turned off automatically as can be done with a solitary event. In the case of a partition when the partition is lifted the host that is running the virtual computer that has lost access to its storage space will recognize that he has lost access and then kill the process from the virtual machine.

  Who help me?

• Question about the response of isolation.

  With HA as well with the pulse network and the data store is a host isolation response (Dungeon powered on/stop/off voltage) triggered if only the mgmt network breaks down or the datstores (used for hb) the network should down before a response of isolation they provoked?

  http://www.yellow-bricks.com/2011/10/03/datastore-heartbeating-and-preventing-isolation-events/

• DAS.failuredetectiontime

  Increase the das.failuredetectiontime requires a restart of the AH?

  My answear is based on experience.

  StarWind software developer

  www.starwindsoftware.com

• Virtual machines off the power during the response of isolation of riding

  We have 2 ESx 3.5 update 3 groups in our environment. Clusters have HA and response of isolation The Drs is configured from virtual machines under tension. During a network outage, on one of the hosts, all virtual machines were turned off. None of the virtual machines on other host turned off. Virtual machines had come back on the other cluster hosts once the network was up and VC was reachable.

  Prior to the maintenance of the network, due to a problem, this particular host was disconnected from the VC earlier. We were unable to connect to the server through the VI Client and restarted the service pass. Prior to the maintenance of the network, we identified that this single host was not related to performance on the VC Server data. Also some jobs started on the host would go to 100% but show never completed.

  My request is could the problem above caused virtual machines to restart despite the response of insulation parameter. Before the interview, I could find this host receiving the heart beats of VC server and other hosts in the cluster and VC showed no error associated with HA on the cluster or the particular host.

  We rebooted the host after the maintenance of the network and reconfigured HA on the cluster. Since then, it works fine. We had another interview to the network and we have had no problem with VM restarts.

  Looks like your ha agent may be dead as well as your connection between the host and VC.  There are several newspapers linked to HA, under/var/log/vmware/aam.  You can check to see if they provide additional insight as to why HA acted differently on a vs host others.

  -KjB

  VMware vExpert

  Don't forget to leave some points for messages useful/correct.

• HA and response of isolation

  Lately, we have been plagued by short network outages. The results are that some ESX servers become isolated from the environment for a "short" period Rather than having HA restart the virtual machine, I have the answer of insulation HA configured from the virtual machine. After each of these failures, I get many messages from event saying as 'failover failed for this virtual machine' as well as the messages 'lack of resources for failover. We have disabled DRS.  Are these erronously generated messages and are typical of what gets saved when a HA under control ESX host is isolated or HA are actually trying to restart mode and felt some sort of failure? I want to just determine if I potentially have something configured incorrectly as I expect to see a message on the disconnected ESX Server but not any attempt to restart the virtual computer (unless the real server crashed and released its lock on the VM - which was not). PS - we are working on network problems, but it's taking the time... Thank you

  HA has been activated. Don't forget it does 2 things, he wants to start a new copy of each VM "failed", and he wants to (eventually) to ensure that the broken one is away.

  Response of isolation sets whether or not he cleans on the server 'failed '. It will try to start a new copy without worrying.

  In your case, it "detects" a "failure" and tries to start a new copy. The virtual machine still works so its files are locked, on the SAN. That's why the poweron fails and you receive the error message. If you were on a filesystem without locking (NFS) he could have succeeded - messy!

  For some that you want to stop these false alarms HA, what you've done NOT extinguished HA.

  -

  oldvbase

  I used to be an Oracle, now I'm not really here

• The response of isolation HA best practices

  Someone at - it a good document that point to practices for configuring HA iolation answers?

  I found this http://download3.VMware.com/VMworld/2006/tac9413.PDF but it loses something if you never heard of the presentation.

  Here are a couple of things worth seeing

  http://www.yellow-bricks.com/VMware-high-availability-deepdiv/

  http://www.VMware.com/PDF/vSphere4/R41/vsp_41_availability.PDF

• 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

• 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

• 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

• 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

• 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.

• VM doesn't have a vmotion after that host was isolated.

  Hello world!

  We have recovered from it, but had to manually!

  One of our hosts running 4.1 became isolated, because vsphere always showed the host, but we could not even place the host mode now as most of the features are grayed out. Host showed as disconnected in vsphere. clicking on CONNECT has not set the it. Reboot the host, the host came back with an error «file missing startup...» ", and we had to use the REPAIR cd to get it restored.

  My question is, why didn't all of vmotion of our VM for the other two hosts when this host became isolated?

  HA is enabled,

  VMware HA is checked to activate the tracking host.

  Admission control is enabled

  Admission control policy is set: chess host tolerates the value: 1

  Virtual Machine options are: cluster parameters: vm restart priority: are AVERAGE and response of isolation the host is set to Power Off.

  Monitoring of the VM is: VM monitoring only and the sensitivity is set to MEDIUM.

  We use Vsphere Essentials Plus 4.1 on 3 HP DL 365 G5 hosts and an EMC Clariion SAN.

  Thank you!

  Peter

  Your DNS server on the host that is down?  I had a simiar situation where both of my primary and secondary DNS servers have been on the host that is down.  vCenter eventially lost communication with guests because he could not resolve names.  Restart the host did not work because they were stopping the process of HA. vCenter could not restart on the other hosts because of the DNS problem.  I had to open a web console on the first host to start the DNS servers manually.

  I now have a rule of DRS Setup so that my DNS servers cannot be on the same host.  I also put the names of all my hosts in the host file on my server vCenter.

• This is expected behavior with master isolation?

  Hello

  I test HA in a vSphere cluster 5.1 and I want to know if the behavior seen when a master is isolated is normal.

  I have 2 knots in my dev Setup. When I isolate my slave (host B) virtual machine stays on as planned (response of isolation leave it powered on).
  Host B shows that does not and the virtual machine is disconnected, so this works as expected.

  When I isolate my master (host A) of network management of the electoral process unfolds.  Host A show that does not as expected. My virtual machine appears as turned on host B off.
  The diary of events for the virtual machine tells me that

  -the VM is off on host B

  -l' host B cannot open the VMX file

  -vSphere HA switched in vain this virtual machine

  All the while my VM is accessible and functional. As soon as the host has is is more isolated my VM appears as again propelled this issue.
  If everything seems to work as it should, but in vCenter messages say otherwise. Is this normal?

  When I simulate a failed host everything works as expected, regardless of whether it is master or slave

  The behavior you're seeing is planned.

  Let's start with your recent tests. When you remove the current master of the management network, the other FDM is still able to communicate with the master, and so it reconnects with the 2nd network. The election you are seeing is the result of this process - the slave FDM lost access to the master, drops in the State of the election, received a message 'am master' of a master and connected. A master of FDM sends 'Master am' election messages on all its management networks every second and a slave will connect to the master using any network of which he received this message.

  VC reports no master, as you alluded to, is because the VC cannot communicate with the master. VC knows that there is a master because the other FDM would have said what is the master. I'll drop a PR for us to improve the text of question config.

  Regarding your original posting, I think that the difference of behavior you observed is due to a problem that we have fixed in version 5.5. When you have isolated the master, a new master election occurred. There is a race (we closed) between the new master learning that on the old host virtual machines are turned on and the main workflow for the restart of virtual machines. If restarting the workflow performed too fast, the new master would try to restart the virtual machines that he discovered later were running on the remote host.

  Finally, a clarification of the following statement by taking in charge:

  "As it is the master who shall report to the vCenter, until a new Master has been established, the display in vCenter won't be accurate when it is isolated.  (I think vCenter new elections of master/slave status is checked every 2 minutes by default).

  VC checks actually for a master every 10 seconds by default. How much is the value of 2 minutes of time VC tries to connect to a master before it reports via an event/config-problem, what it does.

• event and comments stop isolation helps

  Hi group.

  Today my entire cluster (about 20 MV on 3 servers) has experienced an event where after that we have rebooted one of our physical switches, all guests are locked down.

  I understand that it is the default if you have a single switch, but we have 2 switches in total redundancy.

  How are configured adapters, they are configured for the group for the console and vmkernel.

  After looking through the config, I wonder if reunification is not the right choice?  Maybe I chose single adapter with an option of auxiliary card?

  Any help is appreciated!

  Yes to 'portfast spanning-tree trunk.

  Words of configuration active / standby and das.failuredetectiontime, please take a look at the link I provided above. This is haow I usually set up.

  André