MTU size

Drobo - End of Sale Drobo FS
1

Is the MTU value accurate when running “ip link” on the drobo? This is what I get back, even tho I’ve change the MTU value in the dashboard

1: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 532

I don’t really see any speed difference when playing with the MTU settings.