Wow.. so, how much interference is caused by the ambient noise of the server room itself? Is there some "critical threshold" for noise beyond which you'd have to install sound dampeners or smth?
I've had a case that caused disk performance to drop because the memory correctable errors rose above a server BMC threshold.
Turned out that the BMC beeped the internal speaker which vibrated the chassis at the right harmonic frequency that matches the HDD sensitivity spot and reduced performance. After that we disconnected the speaker on all servers.
The overall nose may impact the HDD performance but mostly if the vibration is at the right frequencies. Some are a lot more important than others.