HA response of Isolation with VSANs

Similar Questions

• 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/

• Response of Isolation always das.failuredetectiontime - 1?

  Of Duncan Eppings ' HA /DRS technical Deepdive ", I see that (with default settings) the following will happen:

  on 13 sec: a host that means none of the partners will ping to address isolation

  in 14 dry: If no reply address of isolation, it trigger the response of isolation

  on the 15 sec: the host will be declared dead by the remaining hosts, this will be confirmed by the missing host ping

  16 dry: will start the restarts the virtual machines

  My first question is: all these timings are the das.failuredetectiontime? In other words, if das.failuredetectiontime is set to for example 30000 (30 sec) then the 28 second an isolated potential host will try to ping the address of the isolation and make the response of Isolation action 29 seconds?

  Or is the answer of insulation hardcoded timings and it always happens at 13 sec?

  My second question, if the answer is Yes, the above, why is the recommendation to increase das.failuredetectiontime to 20,000 if having multiple addresses response of Isolation? If the above is correct, then it would make to the isolated potential host to test its isolation addresses 18 seconds and restarts the virtual machines will begin at 21 second, but what would be the gain of this really?

  You are right. I think that at a point that several instructions are merged into a single statement which is technically inaccurate. Sorry for the confusion,

• 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

• Someone knows the extremely slow response and delay with "not responding" on more complex web pages after installing updates on Friday?

  Since the installation of 16 Nov received security patches I've known really slow response with Internet Explorer; 2 minutes between web pages on my WIN7 Pro PC and not much better on my VISTA Business PC.  I get expired on complex web pages the context comes up with "program addresses not" or the pop-up at the bottom of the screen asking me to do it again.  The problem is not limited to Internet Explorer, but also prevents Safari to come.   I tried to reinstall WIN7 Pro, but the problem remains.  I'm also not able to run You Tube or other videos.  There is no download or updated or running Belarc Advisor Windows installation problems.  While the problem occurs with Yahoo Mail, it is not an impact send/receive in Outlook.  Does not appear to impact, nothing other than browsing the web.

  Hi ephd,.

  Thanks for posting in Microsoft Communities. The problem description, I understand that the internet works slowly. Provide the following information:

  ·         Have updates you installed?

  ·         You get the error message?

  Follow these methods.

  Method 1: Temporarily disable the security software .

  Note: Antivirus software can help protect your computer against viruses and other security threats. In most cases, you should not disable your antivirus software. If you do not disable temporarily to install other software, you must reactivate as soon as you are finished. If you are connected to the Internet or a network during the time that your antivirus software is disabled, your computer is vulnerable to attacks.

  Method 2: Follow these steps:

  Step 1: Start the computer in safe mode with network and check.

  Startup options (including safe mode)

  Step 2: If the problem does not persist in safe mode with networking, perform a clean boot to see if there is a software conflict as the clean boot helps eliminate software conflicts.

  Note: After completing the steps in the clean boot troubleshooting, follow the link step 7 to return the computer to a Normal startupmode.

  Method 3: Follow the steps in the article.

  Internet Explorer is slow? 5 things to try

  Note: Reset the Internet Explorer settings can reset security settings or privacy settings that you have added to the list of Trusted Sites. Reset the Internet Explorer settings can also reset parental control settings. We recommend that you note these sites before you use the reset Internet Explorer settings.

  You can see these articles for more information:

  Why is my Internet connection so slow?

  Windows wireless and wired network connection problems

  I hope this helps. Let us know if you need more assistance.

  Thank you.

• Get the response time more with First_Rows Hint.

  Hello
  I use 10.2.0.1.0 oracle version. I have a sql query that gives performance with cutting-edge FIRST_ROWS problem.     I expect the best response time with suspicion of "FIRST_ROWS (5)", but his is the worst, with use of a different set of the index, which is local to the partition. Please, help me to understand, the reason behind this change in negative execution path?
  

       First query gives all the ~3488 rows within ~1 minutes but the query with HINT is taking ~15 minutes for providing initial few rows itself. 
  For second one i am not able to get the exact and estimated cardinality stats , as it was taking lot of time for completion, so providing Autotrace plan only.
       
  Main Query:

  Published by: 930254 on October 15, 2012 04:55

  930254 wrote:
  Yes, Jonathan, in fact in the first case, i 'I' table is being analyzed using an overall index, but suspicion FIRST_ROW sound using the index that is local to the partition. resulting in the digitization of all partitions of 448. I think it's causing bottleneck. Is there something like: FIRST_ROW suspicion that affect this type of systematic index scan?

  In the first case the optimizer has unnested subquery of REACTION and used to bring to the table, I, and that's what dictated the choice of index.

  In the case of first_rows (5) decided that the range index scan will take adequate data if some time he chose a different index - running subqueries in the REACTION as a subquery for filter on each line. But it is the estimate of how long it will find adequate data (and how much time he will have to run the subquery to eliminate unnecessary data) does not.

  Concerning
  Jonathan Lewis

• Image and JSON response is possible with mapviewer

  Hello
  I am a newbie to mapviewer, however I have good skills with Open Source such as Geoserver map server, recently the data store has really exceeded the limits of my Architecture of Web mapping and nowadays I am bussy assess Mapviewer.
  
  I read the manual of the API and perform all demos, I think its fantastic, but in my scenario, I need to use without the javascript Api Maps Oralce mapviewer. It is possible to get an answer simple image when WMS calls ask and it is possible to get a JSON response agaisnt WFS request, because I use my web application and map server are in different domains, in order to avoid the same origin policy, I used JSON to my answers WFS. These two things are possible, in mapviewer or is it mandatory to use mapviewer with oracle map api.
  
  Kind regards.
  Imran

  WMS returns an image. WFS returns a xml (GML) doc as a response.
  JSON is not supported in the current version.

• Request, the response of webservice with CDATA

  I need assistance with the query:

  declare

  Xml_RESPONSE Xmltype: = xmltype)

  ' ' < SOAP - ENV:Envelope xmlns:SOAP - ENV = " http://schemas.xmlsoap.org/SOAP/envelope/ "" xmlns: xsi = " " http://www.w3.org/2001/XMLSchema-instance "container =" " http://www.w3.org/2001/XMLSchema ">

  < SOAP - ENV:Body >

  " < ns1:Person1sResponse SOAP - ENV:encodingStyle = ' http://schemas.xmlsoap.org/SOAP/encoding/ "xmlns:ns1 ="MAP112"> "

  < back xsi: type = "xsd: String" > <! [CDATA [< person Ident1 = "234" > < 47 > < / Age > < Day_Time > 2015 - SEP - 03 08:55:43 < / Day_Time > < / person >]] > < / return >

  < / ns1:Person1sResponse >

  < / SOAP - ENV:Body >

  (< / SOAP - ENV:Envelope > ');

  BEGIN

  C IN)

  SELECT B2.*

  FROM XMLTable)

  XMLNamespaces)

               ' http://schemas.xmlsoap.org/SOAP/envelope/ ' AS "SOAP-ENV"

  , "MAP112" AS "ns1."

  )

  , ' SOAP - ENV:Envelope / SOAP - ENV:Body / ns1:Person1sResponse / back '

  by the way Xml_RESPONSE

  path of columns person clob '.'

  ) A1

  XMLTable)

  "' / Person"

  by the way xmlparse (document A1. Person)

  age columns VARCHAR2 (10) PATH 'Age '.

  ) B2

  ) LOOP

  DBMS_OUTPUT. Put_line (' output: ' |) C.Age);

  END LOOP;

  END;

  Thank you

  Kostadin

  Your code is perfectly fine.

  What problem do you have?

  SQL> set serveroutput on
  SQL>
  SQL>
  SQL> declare
    2
    3  Xml_RESPONSE  Xmltype := xmltype(
    4  '
    5     
    6        
    7           4703-SEP-2015 08:55:43]]>
    8        
    9     
   10  ');
   11
   12  BEGIN
   13
   14  FOR C IN (
   15  SELECT B2.*
   16      FROM XMLTable(
   17             XMLNamespaces(
   18               'http://schemas.xmlsoap.org/soap/envelope/' AS "SOAP-ENV"
   19               ,'MAP112' AS  "ns1"
   20             )
   21           , 'SOAP-ENV:Envelope/SOAP-ENV:Body/ns1:Person1sResponse/return'
   22             passing    Xml_RESPONSE
   23             columns Person  clob path '.'
   24          ) A1
   25        , XMLTable(
   26            '/Person'
   27            passing xmlparse(document A1.Person)
   28            columns     Age  VARCHAR2(10) PATH 'Age'
   29          ) B2
   30            ) LOOP
   31            DBMS_OUTPUT.PUT_LINE( 'output:    '|| C.Age   );
   32            END LOOP;
   33  END ;
   34  /
  
  output:    47
  
  PL/SQL procedure successfully completed.
  

• 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

• 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.

• 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

• Scenario VSAN with 3 hosts - hosts, 2/3 down

  Hello community,

  I have a question about the following scenario. Take a look at my enclosed PDF also.

  -VSAN with a total of 3 guests (A, B, C)

  -VM 1 is running on host a.

  What happens when the host B and C goes down?

  The VM on the host of way continues running or down also?

  Thanks for that.

  Migo

  lmigo wrote:

  What I need, is that the virtual machine host A continues to operate even if the hosts B and C go away.

  As the VMS on host A is running and there is no problem, I want to make it work so that problems with & B and C are resolved.

  Is this possible in a VSAN environment?

  "There is no problem" depends on how you look at it. From a point of view VSAN you just lost quorum as more then 50% of the components must be available. There are a lot of questions in this scenario as I see it. What you are looking for is not possible with VSAN.

• 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