On the 30th of June 2015 a leap second will be added, this could have an effect on some Operating Systems and result in high CPU usage. Leap second already happened in 2012 and 2008, but no issues were observed.
For general information from SAP point of view please consult information in notes below:
From Windows point of view you can find more information in Microsoft knowledgebase :
From Red Hat Enterprise Linux point of view you can find more information in Redhat knowledgebase :
Do you have further questions?
Before creating an SAP incident, you can post a discussion thread in the Software Logistics discussion space. Community members will provide you with the answers you need.