I'm testing the frame size by adjusting it from 1500 to 9000 for the link to the storage NAS to optimize the 10 gigabit connection and have seen an increase of speed to almost 300% read speeds.
I would like to further test the stability of this tweak, but what I would like to know is whether there will be a decrease in performance if the clients can only support up to gigabit speed. The setup is the following:
For the test: Dell server with 10 GbE NIC and jumbo packets set to 9000 Direct link to Synology NAS with 10 GbE NIC and MTU set to 9000
In production the following will be applied: D-link 1510 52x gigabit switch with 10 GbE uplink to Synology NAS.
That switch would receive 1500 size packets from the clients (and can't be changed because it also provides the connection to the Internet), and would have the uplink to the NAS set to 9000 jumbo packets, if that's a possible setup.
Will that be a reliable (and possible) setup in the way that gigabit 1500 MTU connections will go to 10 gigabit 9000 MTU to the NAS via the uplink? I know that the other way around that would result in dropped packets, but is it also for this case?