When to use WAN Acceleration?

[bunger]

What is the general rule on when WAN Acceleration is needed or becomes a value added item?

[Gostev]

Always use it for links slower than 100 Mbps. For faster links, consider using if you want to trade performance for bandwidth consumption.

[ober72]

I might have misheard but at the VeeamOn conference I believe that they said that it only works on Exchange and system data, so if you had a huge file server it might not be worth putting it through the extra loops. Again the parties at VeeamOn were so good it might have blurred my memory

[Gostev]

They were talking about global cache specifically. We are populating global cache only with data that is likely to be non-unique within or across VMs (such as OS data, emails, attachments). However, global cache is only one cache we use - we are also using actual target backup repository as a another "cache" for lookup as well. So overall, WAN acceleration works on all virtual disks of every VM regardless of the application it is running.

Moreover, you can actually set global cache to cache every block with advanced settings, but this usually does more harm than good due to trashing global cache with unique data, squeezing out data that is more likely to be non-unique.

[davide.depaoli]

Hi,
I've found this article https://www.veeam.com/kb1877 regarding V7 guidelines for WAN accelerator, that say:
Link <3Mb/s - WAN likely saturated; processing rate dependent on data reduction ratio (estimated 10x)
Link >3Mb/s and <50Mb/s - WAN will not be fully utilized; expect ~5MB/s processing rate but less bandwidth
Link >50Mb/s - WAN will not be fully utilized, using direct mode copy will use more bandwidth but likely be faster

these informations are still valid for V9 ?

thank you
Davide

[veremin]

these informations are still valid for V9 ?

Nope, as the WAN acceleration engine has been vastly improved since then. Thanks.