Mehma Sarja wrote:

> There is one more thing to think about and that is cumulative aging. 
> Starting with all new disks is a false sense of security because as they 
> age, and if they are in any sort of RAID/performance configuration, they 
> will age and wear evenly.

Expanding on that:

It is generally a bad idea to use 100% drives from the same 
manufacturing batch because their eventual failures are likely to be 
very close together

Similarly it is a good idea to use a mix of drives from different 
manufacturers, in order to try and spread any failures out over a longer 
period of time.

I know of very few hardware suppliers who mix batches in their raid 
arrays and of none who mix manufacturers. So far this hasn't been a 
problem for our hardware arrays, but I prefer to mix things up when 
building software arrays.

AB



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