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Forum > Installation > DPM backing up Hyperv with second management nic

DPM backing up Hyperv with second management nic

Use this forum to post about any System Center Data Protection Manager installation issues you are experiencing. Also post here if you have any comments or tips on installing DPM.

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1/27/2010 5:13:36 PM

Michael

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DPM backing up Hyperv with second management nic

We are having an issue backing up vm's on a hyperv s008r2 server. All was working fine with a single nic. We added a seconf nic for a management port and left the original nic foe vm traffic. We no longer can back up vm's. The DPM will start to back up and get to about 16meg and then no more. The counter will continue but no data is ransferred. It will stasy in the condition and through no alerts. Any help would be appreciated.

1/27/2010 9:17:51 PM

David

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David Allen

Re: DPM backing up Hyperv with second management nic

Hi there,

When you say that you added a second NIC for management, do you mean that you want to use it as a dedicated backup LAN? If so, you can configure DPM to use a backup network address using PowerShell. The cmdlet to set a backup network address is Add-BackupNetwork Address and you can find full details on how to use it here, http://technet.microsoft.com/en-us/library/cc964298.aspx.

If I've miss-understood your question, please let me know but hopefully this will help you.

David

1/28/2010 2:49:05 PM

Michael

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Re: DPM backing up Hyperv with second management nic

The second NIC is put into the hyperv server. We want to stop the backup traffic from going on the same interface as the regular traffic to the vm's. The DPM agent is installed only on the hyperv server. Not the guests.

1/28/2010 3:03:10 PM

David

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David Allen

Re: DPM backing up Hyperv with second management nic

Ah OK. How are the cards configured, does each NIC have it's own IP and how is DNS setup, is there a new DNS entry to point to the Hyper-V host on a different IP?

1/28/2010 3:08:57 PM

Michael

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Re: DPM backing up Hyperv with second management nic

The management NIC is static with a static DNS entry. The shared NIC is DHCP. All traffic to and from the guests, with the exception of DPM, are working well. We got to thinking maybe somehow the vsswriter was bound to the management NIC or something. Last night I went and uninstalled the DPM agent. Deleted all NIC's then reset the machines. When the came back up and reinstalled the NIC's I created the management port then the guests NIC. Got all VM's up. Re-installed the DPM agent. Tried a backup and got the same results.

1/28/2010 8:43:17 PM

David

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David Allen

Re: DPM backing up Hyperv with second management nic

As you don't have a dedicated backup network, just a second NIC I would give the NIC a static IP address and then update the HOSTS file on the DPM server.

DPM servers communicate with their agents using the FQDN from AD/DNS so add an entry into the HOSTS file on the DPM server for the FQDN of your Hyper-V host with the IP address of the NIC you want the traffic to go through. As DPM responds to requests on the same NIC the request was received on, all your traffic should flow over that NIC.

HTH

David

1/31/2010 5:03:05 AM

Michael

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Re: DPM backing up Hyperv with second management nic

This is my understanding of how we have this set up. We have an agent installed on the Hyperv server. The guests don't have an agent. When a backup occurs it is backing up the vhd on the host. All managenment trafic goes through the NIC with a static. DNS has this entry also. Am I missunderstanding how DPM gets the back up of the guests.

1/31/2010 8:08:40 PM

David

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David Allen

Re: DPM backing up Hyperv with second management nic

Hello,

Perhaps there is some confusion here, as I understand it you have a DPM Server and a Hyper-V host with a number of guests. You have deployed an agent to the Hyper-V host and you are configuring protection of the guests. You have added a new NIC to the Hyper-V host for all DPM traffic to flow to and from the DPM server. Would this be correct?

As far as protecting guests, DPM utilises the VSS service to protect the VHD files. If you have the Hyper-V integration tools installed on the guest, this is done seamlessly with no downtime. If the integration tools are not installed, the guest will be paused while a snapshot is taken.

David

2/1/2010 3:49:03 AM

Michael

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Re: DPM backing up Hyperv with second management nic

That is correct with the exception the second NIC isn't specific to DPM traffic. All traffic to this server is to go through this device. The second NIC is for all traffic to and from the guests. With that said, What you suggested about setting the host in the DPM server would hold true? Is your thinking that the traffic from the server to the DPM is trying to go out the non management NIC?

2/1/2010 3:50:01 AM

Michael

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Re: DPM backing up Hyperv with second management nic

How is the Host statically set in the DPM?

2/4/2010 11:29:24 AM

David

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David Allen

Re: DPM backing up Hyperv with second management nic

Hello,

Communication in DPM is initiated by the DPM server and DPM resolves the server address in DNS. The DPM agent will return data on the same IP on which the request came in on.

So providing the DPM server resolves the Hyper-V host FQDN (must be FQDN, not NetBIOS name) to the IP address of the NIC you want to use, that should work fine. As updating DNS will probably affect other network communication, updating the HOSTS file on the DPM server is the more suitable option.

David

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