Assuming you need to find it in a cluster of drives... go to the auto-parts store.  They have a stethoscope like tool for finding rattling in engines.  Place on each drive (assuming you have physical access) until you find the offender.  They can be got for around $10US and are called Mechanic's Stethoscope.

-- Fred 

On Fri, Sep 14, 2018 at 10:33 PM ToddAndMargo <ToddAndMargo@zoho.com> wrote:
On 09/14/2018 09:58 PM, Joe Zeff wrote:
> On 09/14/2018 10:15 PM, ToddAndMargo wrote:
>> Hi All,
>>
>> Fedora 28 x64
>>
>> I have a server at a customer site whose hard drive
>> (mechanical) is constantly singing/rattling.
>>
>> How would you chase down the offender?
>
> Replace the drive before it fails.

It is in an RSTe raid 1 pair

I am trying to figure out who is doing all the
writes and/or reads to/from the hard drive
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