I'm in the process of setting up VMware backups but the transfer rates using nbd are very very slow. The media server and ESX servers each use single 1GB NIC's and even with multiple backups going across multiple ESX server's the NIC on the media server is frequently below 1% utilized. Occasionally the utilization in Windows Task Manager for the network interface will look like a square wave bouncing between 0% and 50% utilization. There are points where it can get close to 100% utilization with 8 going at once but even with 8 active backups it is frequently below 30-50%.
I don't think it is a problem with the network itself as normal client backups do not have a problem maxing out the NIC. I tried the suggestion in TECH191183 to disable disk caching in vxDiskLib.ini but that did not seem to have any affect. The ESX servers are v5.5. There are multiple VMKernel ports on the ESX servers but backups are the only one using this NIC. I've scheduled to update Netbackup 7.6.0.2 early next week to see if that helps speed things up. I've included OS and Netbackup version info below. If more info is needed please let me know.
- Master Server
- RedHat 6.3
- Netbackup 7.5.0.3
- Media Server/VMware Backup Host
- Windows 2008 R2
- Netbackup 7.5.0.3