What does どうかじゃない mean?


I get that どうか alone means something along the lines of "please", but what
happens when you add じゃない as a suffix? I've seen this being used before but I
can't quite place my finger on what it might mean.  
The full sentence would be それでもやれるかどうかじゃない.




それでもやれるかどうかじゃない = 'Even so, it's not about whether you can/are able to do it
or not.'




それでもやれるかどうかじゃない = 'Even so, it's not about whether you can/are able to do it
or not.'

