Hewlett Packard Enterprise HPE.N gained 5.8% after the IT and hardware firm raised its FY22 profit outlook due to robust demand and profitability. By Devik Jain March 2 (Reuters) - U.S. stock index futures notched cautious gains on Wednesday, ahead of Federal Reserve Chair Jerome Powell's testimony for clues on interest rates as the Ukraine crisis exacerbates concerns about inflation and growth. The mood remained dour across global stock markets as Brent crude jumped to near eight-year highs and metal prices rallied after Western sanctions disrupted transport of commodities exported by Russia.