We noticed that, when the proxies are set to Network mode, the throughput of individual VMDK's is very low. Example:
We see a fileserver, with 3 disks (50gig, 80gig and 900gig) being backed-up and the console says something like:
This means that harddisk 3 takes many hours to complete.Harddisk 1 (50GB) 945MB read at 11 MB/s CBT
Harddisk 2 (80GB) 671MB read at 13 MB/s CBT
Harddisk 3 (900GB) 354.3GB read at 10 MB/s CBT
This fileserver has a high change-rate on that disk 3 by the way.
We observed this behaviour (very low read speeds of 10 to 15 MB/s) for several weeks.
Then, out of curiosity, we changed those 2 proxies to Virtual Appliance Mode (hotadd). The Job did not change. Since then we see something like this everyday:
Needles to say, backups are massively faster. Done in a jiffy.Harddisk 1 (50GB) 441MB read at 341 MB/s CBT
Harddisk 2 (80GB) 468MB read at 298 MB/s CBT
Harddisk 3 (900GB) 414.6GB read at 411 MB/s CBT
So this begs the question: why these super slow read speeds in Network mode? All is well. No errors. Just super slow compared to HotAdd.
The hardware is really powerful. If i'm not mistaken, the documentation even recommends Network mode on high bandwidth networks.