Re: When do you replace old hard drives in a raid6?

[Ram Ramesh <rramesh2400@gmail.com>]

On 03/06/2016 06:29 PM, Phil Turmel wrote:
> On 03/05/2016 03:49 PM, Ram Ramesh wrote:
>> I am curious if people actually replace hard drives periodically because
>> they are old or out of warranty. My 5 device raid6 has several older
>> drives (3/5 are 3+ years old and out of warranty) They seem fine with
>> SMART and raid scrubs. However, it makes me wonder when they will die.
>> What is the best policy in such situations? More importantly, do people
>> wait for disks to die and then replace or have some ad hoc schedule of
>> replacing (like every 6mo replace oldest) to keep things safe?
> I replace drives when their relocation count hits double digits.  In my
> limited sample, that's typically after 40,000 hours.
>
> Phil

Thanks for the data point. 40K hours means roughly 4.5 years with 24/7. 
That is very good. You use enterprise drives? Mine are desktop (and may 
be one HGST NAS)

My SMART is perfect except for power on hours. I am going to take it 
easy for now as I have a spare (not part of a RAID) just in case 
something bad happens.

Ramesh