Problem is I having 9k DPS only.. I can tank well.. I did those leap-IP-leap but when that big guy enrage that's end of my story the meteor drop non stop.. Couldnt kill him in 3 minute time.. Any safe spot to avoid the meteor like butcher bottom entrance

sprint rune might be nerfed in next patch, be careful

Next patch, Inferno penalty for lifesteal % also applies to LOH. LOH will only return 20% in Inferno. 

Both my WD and Barb in act 2 inferno now.

For barb, how does the ignore pain skills help? After I cast and jump to the elite (iron impact), the Hp still reduce so fast. Did I use it wrongly?

Btw , barb armour: 6.9k and all resist 400++
Dps : 25k. Hp: 32k
All this is before buff.
Is it my AR too low for barb?

Means that the skill ignore pain doesn't help if the AR  and armour is low?

Ur stats is fine... Minimum AR for act 2 is 400++.... Maybe u r not cycling ur CDs correctly.... Also maybe u should bump ur hp to 40k++... That might help more....
Not really.... His stats are ok...
Ignore pain helps in a lot of ways.... Solve ur 1st problem then look into skills later.... Maybe u can post ur skill build???
Ur HP is too low.... I can clear act 3 with the same stats as urs but with higher HP.... Ur stats is more than enuf to farm everything.... Once u solved ur survivability issue, then look into DPS to farm more efficient...