predicted failure of disk in raid10 array

[Campbell McLeay]

Hi,

We have one disk that is reporting 'predicted failure' in a raid 10 
array. I assume that it is still participating in the array. Is it worth 
trying to offline it and then online it again (or is this dangerous), to 
see if comes back, or is it just better to offline it and replace it? Or 
should it just be left until it fails?

Kind regards,

Campbell