HA retry time host isolation?

Similar Questions

• 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

  -

• 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

• 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

• 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

• host isolation question

  When ESX host is isolated from the network? Once, he loses the Service Console or the management network WLAN?

  Network isolation occurs when:

  • Host online cannot receive heartbeat of the other primary guests AND

  • The impossible host isolation ping address

  Although your always up and running Layer2 switch and your dependent hos-to-host communication on the basis of the existence, of course network isolation switches will happen.

  http://www.no-x.org

• 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

• 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.

• need to get the time host was put in the annotation and maintenance mode

  Hi - it is possible to get the time that a host has been in maintenance mode and also seize any annotation is attached to the ESX host in VC?

  Thank you

  ~ Sai

  Also, by using "get-vmhost" twice is redundant since you have channeled from get-vmhost: "E = { get-vmhost $_ |}". Get-vievent ".

  However, your order will be to return the entire event object and look like:

  Name                                    Event

  ----                                    -----

  host {VMware.Vim.EnteredMaintenanceModeEv...

  You can try below instead:

  Get-VMHost |? {$_. ConnectionState-match 'Maintenance'} | Select Name, @{N = 'Time put in MaintMode'; E={($_ | Get-VIEvent |? {$_. FullFormattedMessage-like"* entered maintenance mode *"} (). " Createduserid}}

  But it can still recover multiple events, so a way to get only the last event and time is below:

  Get-VMHost |? {$_. ConnectionState-match 'Maintenance'} | Select Name, @{N = 'Time put in MaintMode'; E={($_ | Get-VIEvent |? {$_. {"FullFormattedMessage-like" * entered maintenance mode * "} | toplayer-last 1). Createduserid}}

• 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

• All virtual machines on my ESX host off power at the same time

  Hi all

  Recently I attend the interview. a guy asked me this question

  < police = "Times New Roman, serif" >all virtual machines on my power off ESX at the same time host < / police >< / police >?

  What was the cause of the highest of the error, how to troubleshoot the error.please me.anybody guide to address this problem?

  Thanks

  Surya

  If all the virtual machines if lower at the same time, my bet would be VMware HA. Just for fun, build it inside your head:

  (1) 8 ESX nodes, all service consoles connected to a unique management switch.

  (2) now to create a cluster of these nodes, put all your virtual machines in there and activate HA, choose ' host isolation response: power off.

  (3) draw power from your management switch. HA on each host will deduct that the host is isolated-> turn off all the virtual machines.

  Each host will think the same thing, and hop find you with all virtual machines down to the time in the whole of the cluster. Have seen this one several times when people go and upgrade their management switches in the evening ("hey, it's only management").

  Visit my blog at http://www.vmdamentals.com

• 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.

• Average displacement Subvi does not refresh the data in time real host VI

  Hello!

  I time real host VI that has evaluate the NI 9215 cRIO block data 9073. He takes analog data and calculates the phase shift. It works well with the connected equipment and displays the results. I need to get the moving average value of phase shift, so I add moving average Subvi, where main VI entries - new value (phase shift measured) and ms and output - average value of travel time. When I run real time host VI it gives me a single data and stop get new data from Subvi. It refreshes not even values measured in real time. So the problem somewhere in the accommodation, with sub - VI. How it can be solved? How can I get real host VI with the moving average value of Subvi update running time?

  Thank you.

  Your problem is that you have a loop that runs until you press the Stop button inside your Subvi.  If you try to use a Global Variable that is functional, you have a few things wrong.

  1. the loop should run only once.  A TRUE to the conditional stay Terminal wire.

  2. the shift register cannot be initialized.  That is how he can keep the old elements in a story.  Use a first call? with a case structure so that you only initialize the table of history inside the loop on the first time the VI is called.

  But if you really want to make your life easier, just use the PtByPt.vi mean.  NOR did all the work for you.

• Add new storage "opération TimedOut" with RDM LUN on host. Pls Help

  Hello

  Installation program:

  4 ESX 3.5 hosts each with 2 HBA adapter connected to the HP MSA1000.

  Question:

  I set up MSCS SQL 2000 with RDM through host, MSCS failover without problem, performance wise is not a problem at all too. But the problem is that if the MSCS SQL resource is managed by the Active virtual machine that is running on host1, I can navigate to storage / adding LUNs, set in shape of new LUN with no problems.

  If I want to add new storage on the other host "host2" I received the error "Tor time to ask"is it because of the resource ROW being busy serving the machine virtual active it is why the host not allowing do not change with the addition of new storage?

  Guests see these LUNs. I can add the data store or to do a new analysis also long the LUNS are not presented to the host. Also I can browse the data store, able to see the addition of Storge Wizard when adding new

  Data store and make a new analysis only on the host where the operation of the active node. Suppose the preseneted RDM LUN on host1 and host2 and VM SQL running on host1, I can only browse the data warehouses, a new analysis and add new storge to this host. I can't do the same thing with

  hosts2.

  But if I take these "RDM LUN" LUNS in host2, host3 and host4. I can do a rescan, adding other LUNS as the RDM presented to the virtual machine, able to see the add storage wizard.

  I googled the error and found that the Ontario server is question, or DNS

  Best regards

  Hussain Al Sayed

  Post edited by: habibalby

  I had similar questions to those two problems here where I couldn't add a data store as he would expire and I got the long startup time. I also use RDM which I use for MSCS in the whole of boxes 2. Here's a quote from my previous post in which I found a response that helped me. Changingthe SCSI retry time increased my boot time and allowed me to add one more time without the question of the time-out, data warehouses.

  Response to previous Post:

  I did some research and I think I've made some progress. I found that I get lots of SCSI errors in the VMkernel newspaper. I did some more research and found out that I can change the time retrying SCSI 80 to 10 and it has done wonders for my time to reboot. Now, instead of taking 20 minutes to start, it takes less than 5 minutes now. Much better. I made the change in the host-> advance-> SCSI--> SCSI configuration try again. 80 a the default and 10A was suggested as being a good value. It helped and I will keep an eye on what can make the effect, but so far it has helped with startup times.

  http://communities.VMware.com//thread/203122?TSTART=0