NetWeaver Installation Part II

32. What are sapadm, adm and webadm used for?

A. sapadm is used for Central monitoring services. adm is dedicated to Diagnostic agent installation. webadm is created to use web administration interface for Internet Communication Manager (ICM) and web dispatcher.

33. How to prepare SAP system for NWDI integration?

A .           If you select check box Prepare SAP system for NWDI Integration on the screen NWDI Landscape, SAPinst copies all SCAs belonging to the software units that you installed to the global transport directory.

The SAP NetWeaver Development Infrastructure has a set of services that provide central storage and distributed versioning of Java source code, plus centralized build services and a predefined change management process that control the folow of the software through the landspace. To integrate your SAP system into the development landscape, NWDI requires all installed software components to be available in the file system.

34. How do you plan the Switchover Cluster?

A.            To reduce unplanned downtime for your SAP system by setting up a switchover cluster. This setup installs critical software units - know as "single points of failure" (SPOFs) - across multiple host machines in the cluster. In the event of a failure on the primary node, proprietary switchover software automatically switches the failed software unit to another hardware node in the cluster.

Manual intervention is not required. Applications accessing the failed software unit might experience a short delay but can then resume processing as normal.

Switchoever clusters also have the advantage that you can deliberately initiate switchover to free up a particular node for planned system maintenance. Switchover solutoins can protect against hardware failure and operating system failure but not against human error. 

35. What a switchover cluster consists of?

A.

1. HW cluster of two or more physically separate host machines to run multiple copies of the critical software units, in an SAP system the SPOFs referred to above. 

2. Switchover software to detect failure in a node and switch the affected software unit to the standby node, where it can continue operating.

3. A mechanism to enable application software to seamlessly continue working with the switched software unit - normally this is achieved by virtual addressing.

 

  

36.  How do you manage the creation of operating systems users during the SAP installation in the case of NIS (Network Information System)? 

A. 

SAPinst checks if the required services are available on the host and creates them if necessary. See the log messages about the service entries and adapt the network-wide (NIS) entries accordingly.

SAPinst checks the NIS users, groups, and services using NIS commands. However, SAPinst does not change NIS configurations.

For a distributed or a high-availability system, its recommended that you distribute account information (operating system users and groups) over the network by using NIS.

Note: If you use NFS-V4 file system, you have to create the ora user on the NFS server.

37. Directory structure of ABAP+Java System.