Question 10gbe network switch with gigabit switch

[bertsirkin]

I'm a network novice, having set up my network about 10 years ago, and haven't touched it since.

I currently have a 24 port gigabit switch (D-Link DGS1024D). I'm using 16 ports of the 24 ports now. I have a NAS that I'd like to connect via 10GBE, but don't need 24 high speed ports. I'm thinking of getting a 4 Port QNAP QSW-2104-2T-A-US Unmanaged Switch that has 2-10G ports and 4-2.5G ports. I'd connect one of the 10g ports directly to my NAS and any of the other ports to my gigabit switch.

Does this make sense, or am I missing something here.

TIA,
bert

 

[bill001g]

Not sure why you want to do that. You might as well just hook the nas to the main switch at 1gbit.

The path to the NAS will still be 1gbit between the old and the new switch so it makes no difference if the nas is on a 10gbit port.

Next you need to calculate the actual maximum transfer speed off the disks. It does little good to have a 10gbit port if the media in the NAS can not transfer that fast. Unless you are using fairly high end disk many are still under 1gbit. To get 10gbit speeds you are going to have to be using NVME drives in the nas.

Lets assume your NAS can actually do more than 1gbit. If all your end devices are 1gbit the only way to use more is to have multiple active at the same time. You would need all these on the same switch. The internal speed on most switches is considered non blocking so every port can run maximum up and maximum speed down on every port at the same time. This way you do not have the single gigabit cable limiting you. Be sure to read the specs on any switch you are considering and see what the total backplane speed is. You are looking for a rate that is 2 times the bandwidth of all the ports added together. A 8 port gigabit switch would be 16gbit.

You need to determine which machines you think could benifit the most and plug those directly into the new switch you are considering. If you have more than you have ports for then you might have to replace your big switch.

 

[bertsirkin]

My NAS (Synology DS1522+) has a 10gbe option and my drives are 8gb 7200 RPM Seagate Ironwolf (a maximum sustained data transfer rate of 210MB/s). If my calculations are correct, that's faster than a gigabyte, but not approaching 10gb. My thought was to configure it as below. Only one device would have to have the higher speed to the NAS (the "computer" in the diagram). Since both the computer and the NAS would be connected to 10g ports, there should be a higher speed - assuming the drives in my NAS can transfer faster.

Does that make sense?

thanks!
bert

 

[USAFRet]

Speed through the network depends on the slowest device in the chain.

Given an HDD, you'll not see any magical difference with 10gbe or 2.5, vs standard gigabit.

Also, this depends a LOT on what you're actually moving around the network, and how often.

In my LAN, once something lives on the LAN, network speed does not matter. A movie plays just the same.

 

[bertsirkin]

Speed through the network depends on the slowest device in the chain.

Given an HDD, you'll not see any magical difference with 10gbe or 2.5, vs standard gigabit.

Also, this depends a LOT on what you're actually moving around the network, and how often.

In my LAN, once something lives on the LAN, network speed does not matter. A movie plays just the same.

The files I'll be transferring are between 700gb and 1tb, so I was looking for all the speed I could get! I'll just have to live with what I have.

thanks,
bert