Veeam Backup Proxy Server Sizing

[bk@virtualtn.com]

Hi Guys,
I need you helps regarding veeam backup server sizing best practice:

CPU Sizing:
Rules 1
1 vCPU/core per 250 VM
Rules 2
Each task requires a single CPU core

RAM Sizing:
4 GB RAM plus 200 MB for each concurrent task

If I have physical Server with 2 CPU, 6 core/CPU and RAM= 24 Go
•CPU Sizing: 12 core =12 task
•Ram Sizing: 20 Go = 100 tasks

So in final my proxy server can do only 12 task concurrent task?
Could you please confirm me

Thanks

[PTide]

Hi,

4 GB RAM plus 200 MB for each concurrent task

that's for Backup server, for proxy server it's 2 GB RAM plus 200 MB for each concurrent task.

So, if no other roles are installed on your Proxy Server then your calculations seem to be correct except this part:

20 Gb = 100 tasks

that should be (20 - 2) / 0,2 = 90

Also you should keep im mind that Windows OS also consumes some amount of RAM so the total amount of concurrent tasks your RAM is suffuient for will be lesser.

Thank you.

[bk@virtualtn.com]

thanks Ptide
and what about CPU limitation? Each task requires a single CPU core ?
So in final my proxy server can do only 12 task concurrent task?

[PTide]

Each task requires a single CPU core ? So in final my proxy server can do only 12 task concurrent task?

Yes, correct.

UPDATE 12.02.2016 : Incorrect. Please see this post.

[Vitaliy S.]

Out of curiosity, how many VMs are you going to backup? What processing mode are you going to use?

[bk@virtualtn.com]

We have 2760 VM more than VM have n HDD, so in total we have arround 7495 HDD (130 VM with monster VMDK +5TB)
the backup policy is to do full backup each month per VM with 2 restore points to keep on the disk
We choise direct SAN mode with 2 proxy physique each server have (2 CPU/6 core per CPU and 24 Go for RAM)

Thanks for your help

[Vitaliy S.]

Got it! In this case backup window does not really matter, since you will be doing active fulls each month only, correct?

[bk@virtualtn.com]

Correct.
Every month according to a backup planning will do Fulls VM Backup.

[skrause]

One thing you will want to remember is that each disk in a VM that Veeam has to read is considered a "task" for the proxy server. Also, every Veeam "function" that is installed on that server will require the minimum resources for those tasks as well (direct SAN proxy that also is the repository server would require more RAM/CPU than one that is just one or the other).

[Vitaliy S.]

Good point, Steve! However, the tasks number should not matter much here, since there is no defined backup window and processing speed will depend on the bottleneck reported by a backup job.