raid10 hard disk choice

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Hello,
i have to buy a new server and in the budget i have (small) i have to select one of this two options:

-4 sas 146gb 15k rpm raid10.
-8 sas 146gb 10k rpm raid10.

The server would not be only dedicated to postgresql but to be a file server, the rest of options like plenty of ram and battery backed cache raid card are done but this two different hard disk configuration have the same price and i am not sure what it is better.

If the best option it is different for postgresql that for a file server i would like to know too, thanks.

Regards,
Miguel Angel.

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