[mythtv-users] Mirroring root partition on SSD to a hard drive -- bad idea?

[Calvin Dodge]

Yep, Google's disk survey showed the "same batch" issue was very real.

On Sat, Jan 16, 2016 at 4:02 AM, Simon Hobson <linux at thehobsons.co.uk> wrote:
> Gary Buhrmaster <gary.buhrmaster at gmail.com> wrote:
>
>> Now, if, as you say, you purchased all the drives
>> at the same time, your other drives could be
>> counterfeit too.
> ...
>> There is, of course, another lesson here.  Your
>> "on-site <cold> spare" is not a spare unless
>> you have at least run it "hot" for some (short)
>> period of time.
>
> Indeed.
>
> And there's two things there.
> One issue with raid is that usually all the drives are bought at the same time - and there's a good chance that they'll all come from the same batch (exposing you to batch-specific manufacturing issues).
> So you take several drives, potentially from the same batch, and run them for the same duty cycle/loading - and hope that they'll all fail at substantially different times ! You certainly hope that when one drive fails, the rest last sufficiently longer for you to replace the failed one and rebuild it. Given that some arrays can have rebuild times going out to many hours or even days ...
> And if you run with a hot spare, then it was probably from the same batch, and has been installed and powered up (even if it's not been working) for the same time as the working drives.
>
> So IMO, there's an argument for building an array with different models of drives - ie no two drives identical.
>
> But like everything in life, there's no right or wrong answer to that.
>
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