Aggregate interfaces, is it possible?

[m3a2r1]

Can I aggregate 2 network interfaces to speed up x2 ?

 

[Dunuin]

Depends what you define as "speed up x2". You can for example bond two 1Gbit NICs to get a 2Gbit bandwidth. But it won't make it faster.
Think of it like a single lane road vs a two lane road both with the same speed limit. A single car won't reach the destination faster on a two lane road but it can handle twice as much traffic before creating traffic jams.

Such a bond could be useful when multiple clients access your PVE server, so two clients can connect with 1Gbit each in parallel. But no client will use more than 1Gbit (except for LACP layer3+4 where a single host could use 2Gbit but only with 1Gbit per port/connection).

 

[m3a2r1]

For example I've got pve server with 2 fiber interfaces 10Gbit each and ssd storage with 2 fiber interfaces 10Gbit each. I would like to bond them to get 20Gbit transfer between servers? How to do that?

 

[Dunuin]

See here:
https://pve.proxmox.com/wiki/Network_Configuration#_linux_bond

 

[m3a2r1]

I saw it. But there's no info which bonding can increase speed.

 

[Dunuin]

No bond will increases the speed. If you bond two 10Gbit NICs you dont get a interface that got 20Gbit speed, you get a single interface that can handle two 10Gbit connections in parallel, so a 20Gbit bandwidth.
If you want to increase the bandwidth use one of that list that supports load-balancing like LACP or balance-rr.