Backup Exec often fails over VPN

Some time ago, we switched from MPLS to site-to-site VPN between two sites. When MPLS was in place, there was absolutely no problems with the backup. After the switch, the backup jobs started to fail. The backup software is Backup Exec 2010 R2.

The job failure seems to have no pattern. If I would run the same job twice, once it would fail and I would rerun it without a problem next time.

Both sites have 100Mbps connections and use the same service provider so the connection is reasonably fast. I get on average 5ms RTT for pings. VPN tunnel is setup on ASA's. Interfaces on the switches are clean without any errors.

Below are the error messages I get when the job fails:

1. The job failed with the following error: An unknown error has occurred.
2. An error occurred while processing a B2D command.
Drive: Write() WriteFile failed 0/64 @4189892 (\\192.168.2.2\B2D033004.bkf). Error=64
3. Storage device  reported an error on a request to write data to media. Error reported:
The specified network name is no longer available

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SIM50Asked:
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cooleditConnect With a Mentor Commented:
hi, there

best solution for this to work since it's a 100mb link would be a Media server on the remote location
the problem is that backup exec is not really programmed designed for WAN backup's.

The only Solid Backup Program I have seen been able to do this is Commvault.
or you could use Doubletake for file sync.

The cheapest solution is properly a remote Media server with a Tape device..

Cooledit
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nociSoftware EngineerCommented:
The problem might be because of packet size. backup exec would try to maximise this, and the tunnel overhead on the packets might cause packets to split.  This causes more traffic.

Is it possible to lower the MTU on the systems to be backedup a little (say 30/40 bytes less?)
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SIM50Author Commented:
Thank you for the comments.
Cooledit, I will move media server to remote location today and will update on the status once I ran a few jobs.
noci, I am using HP nic teaming software and I don't see an option to change an MTU size either in the program itself or the hardware properties.
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