Determine and choose network equipment?

Question

Computer networks

Out of the corner of my ear I heard that optical networks are almost an order of magnitude less lag than copper ones.
And, therefore, they are preferable for building a cluster (cloud).
There is a small cloud within the company. 3 servers at the moment, another one will be added soon + 1 server that plays the role of storage. Now everything is united by copper. The storage is presented as an iSCSI drive for cloud servers with virtual machines.
I want the network inside the cloud to work well and not cost fabulous money.
What equipment to use?
For example - for servers, their native brodcom cards with 2 10g SFP + ports are sold
Because 3 servers + storage = 4 ports minimum, more is better. L3+ features are not very relevant, because. it will be physically only the internal network of this cloud and there will be no access through it from the outside.
Does it make sense to switch to optics? Is it really less lag?
What model of a switch for this business you will advise?

Answer 1

Take AlliedTelesis
www.alliedtelesis.ru/switches
After the "big" vendors such as CISCO, HP, Juniper Allied with the highest quality reputation will be.

Answer 2

Are you sure that your network is the bottleneck? And especially the delays in the copper network? Usually, under lower delays in optics, they mean FC-optics, there really other protocols are used and the delays are less than those of ethernet. Although in this case it is unlikely that you will notice a difference (except in price).
To reduce the cost, it’s better for you not to look at optics, but at 10Gb direct attach, it makes no sense to fence optics within the rack.