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Knowledge Base

SVMotion progress gets stuck at 23% and then times out with error: Cannot connect Host (76041)

Last Updated: 9/17/2020Categories: TroubleshootingTotal Views: 24951Language:
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Symptoms

SVMotion Migration task times out with Error: Cannot Connect Host.

Observation : The VMs that are failing to SVMotion have snapshots associated to them. the VMs with no snapshots were able to migrate.

Purpose

Perform Storage vMotion from one datastore in a cluster to another datastore in a different cluster within the same vCenter

Cause

vpxa.log
"Failed to connect to server" i.e. destination server

2019-10-17T08:15:33.967Z warning vpxa[FFCAEAE0] [Originator@6876 sub=Libs opID=k1kc4bzp-ac2q-h5:70030089-fb-01-bb] [NFC ERROR] NfcNewAuthdConnectionEx: Failed to connect to peer. Error: Failed to connect to server 172.17.2.x:902
2019-10-17T08:15:33.967Z error vpxa[FFCAEAE0] [Originator@6876 sub=NfcManager opID=k1kc4bzp-ac2q-h5:70030089-fb-01-bb] [NfcClient] Unable to connect to NFC server: Failed to connect to server 172.17.2.x:902
2019-10-17T08:15:33.967Z error vpxa[FFCAEAE0] [Originator@6876 sub=NfcManager opID=k1kc4bzp-ac2q-h5:70030089-fb-01-bb] [NfcWorker] Error encountered while opening clients for copy spec:
--> N3Vim5Fault16HostConnectFault9ExceptionE(vim.fault.HostConnectFault)
2019-10-17T08:15:33.967Z error vpxa[FFCAEAE0] [Originator@6876 sub=NfcManager opID=k1kc4bzp-ac2q-h5:70030089-fb-01-bb] [NfcManagerImpl] Copy operation failed with error: vim.fault.HostConnectFault
2019-10-17T08:15:33.967Z verbose vpxa[FFCAEAE0] [Originator@6876 sub=PropertyProvider opID=k1kc4bzp-ac2q-h5:70030089-fb-01-bb] RecordOp ASSIGN: info.state, task-3432. Applied change to temp map.
2019-10-17T08:15:33.968Z verbose vpxa[FFCAEAE0] [Originator@6876 sub=PropertyProvider opID=k1kc4bzp-ac2q-h5:70030089-fb-01-bb] RecordOp ASSIGN: info.cancelable, task-3432. Applied change to temp map.
2019-10-17T08:15:33.968Z verbose vpxa[FFCAEAE0] [Originator@6876 sub=PropertyProvider opID=k1kc4bzp-ac2q-h5:70030089-fb-01-bb] RecordOp ASSIGN: info.error, task-3432. Applied change to temp map.
2019-10-17T08:15:33.968Z verbose vpxa[FFCAEAE0] [Originator@6876 sub=PropertyProvider opID=k1kc4bzp-ac2q-h5:70030089-fb-01-bb] [CommitChangesAndNotify] Updating cached values
2019-10-17T08:15:33.968Z info vpxa[FFCAEAE0] [Originator@6876 sub=vpxLro opID=k1kc4bzp-ac2q-h5:70030089-fb-01-bb] [VpxLRO] -- FINISH task-3432
2019-10-17T08:15:33.968Z info vpxa[FFCAEAE0] [Originator@6876 sub=Default opID=k1kc4bzp-ac2q-h5:70030089-fb-01-bb] [VpxLRO] -- ERROR task-3432 -- nfcManager -- nfc.NfcManager.copy: vim.fault.HostConnectFault:

nfcd.log:
Noted the following events in nfcd.log in continuous manner

2019-10-16T08:18:57Z nfcd[34831]: Failed to switch netstack to the vSphereProvisioning stack. Using default management network stack.

Impact / Risks

NA

Resolution

Enable vSphere provisioning on vmkernel ports used for vMotion on both source and destination server.

Go to Host > Configure > VMkernel Adapters under Networking > Select the vmkernel port used for vMotion > Edit

Related Information

Please refer to Vmware Document page :

https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.networking.doc/GUID-D4191320-209E-4CB5-A709-C8741E713348.html

Supports the traffic for virtual machine cold migration, cloning, and snapshot migration. You can use the provisioning TCP/IP to handle Network File Copy (NFC) traffic during long-distance vMotion. NFC provides a file-specific FTP service for vSphere. ESXi uses NFC for copying and moving data between datastores. VMkernel adapters configured with the provisioning TCP/IP stack handle the traffic from cloning the virtual disks of the migrated virtual machines in long-distance vMotion. By using the provisioning TCP/IP stack, you can isolate the traffic from the cloning operations on a separate gateway. After you configure a VMkernel adapter with the provisioning TCP/IP stack, all adapters on the default TCP/IP stack are disabled for the Provisioning traffic.

https://docs.vmware.com/en/VMware-vSphere/6.0/com.vmware.vsphere.vcenterhost.doc/GUID-AC418F24-8E7D-40B6-9D07-A9DB504C7F1B.html

Use the provisioning TCP/IP stack to isolate traffic for cold migration, VM clones, and snapshots, and to assign a dedicated default gateway, routing table, and DNS configuration for this traffic. To enable the Provisioning TCP/IP stack, assign it a new VMkernel adapter.
By using a separate TCP/IP stack, you can handle vMotion and cold migration traffic according to the topology of the network and as required for your organization:

Route the traffic for migration of powered on or powered off virtual machines by using a default gateway that is different from the gateway assigned to the default stack on the host.

By using a separate default gateway, you can use DHCP for IP address assignment to the VMkernel adapters for migration in a flexible way.

Assign a separate set of buffers and sockets.

Avoid routing table conflicts that might otherwise appear when many features are using a common TCP/IP stack.

Isolate traffic to improve security.

Detectable by VMware SkylineTM

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Attachments

Additional Resources

KB
•
End Of General Availability of the Free vSphere Hypervisor (ESXi 7.x and 8.x) (2107518)

KB
•
Download and Install VMware Fusion (2014097)

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