Each site has a setup with 3 physical boxes, 2 of which are running ESXi 5.1, and the remaining one is running Yosemite Server Backup 10.2.00.28419. All 3 physical boxes are plugged in to the same gigabit Ethernet switch in the same rack they are all located in. We are using different software to make VM images, and are only using Yosemite to do file and system state backups.
Data is being collected by Yosemite from
- Local RAID5 Disk of SATA2 drives ~ 170 GB in 1 hour 45mins
- Windows 2012 RD Machine ~ 48 GB in 11 hours
- Windows 2012 DC Machine (system state and a dozen or so small files) ~ 12.55 GB in 3 hours
The only difference between the fast and slow sites in software is that faster site is using a slightly older vSphere/ESXi 5.1.0 build number.
The RD and DC machines are both hosted on 1 of the ESXi boxes which can maintain over 24 TiB/min in disk read from its RAID 10 array of 6xSAS drives, which is much more than the 71 GiB/min maximum of gigabit ethernet, which is again more than the Tandberg drive can do with its write speed of about 2.4 GiB/min
I've tried the idea of adding a null device to backup to ( https://community.ba...y-slow-backups/ ), to see if the slowness is on the backup drive. It is not. The 170GB on the local raid5 disk backs up to the null device at about 4.2 GB/min, but the RD and DC servers still have less than 100 MB/min.
A simple robocopy with the /MT switch will do about 1.9 GB/min from the RD server to the backup server. So the network can handle the traffic.