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:

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

prodsys-vm2 then unregisters each virtual computer.
Wait several minutes, but no other attempts are made to register and/or marketing the virtual machine failed.
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.

Tags: VMware

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