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

[Ram Ramesh <rramesh2400@gmail.com>]

On 03/06/2016 11:18 PM, Phil Turmel wrote:
> On 03/06/2016 07:52 PM, Ram Ramesh wrote:
>> 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)
> I moved from desktop drives to NAS drives about 4 years ago.  So the
> 40k+ hours were on desktop drives.  (A couple started dying in the mid
> 30,000's, but I suspect I overheated those two.)  The oldest NAS drives
> I have now are approaching 40k, and are all still @ zero relocations.
> WD Reds, fwiw.
>
>> 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.
> Yes, sounds reasonable.
>
> Phil
>
My disks have about 10K hours (my server only runs from 4pm-2am). I 
think I have quite a bit of life left
assuming an on/off cycle is not as bad as extra 14 hours of run time.

Ramesh