IBM Updated S1000-007 Exam Questions and Answers by creed

The lspv command displays information about physical volumes on the system, and it retrieves the information from the Object Data Manager (ODM). The ODM is the database that stores information about the system's hardware configuration, including the PVID of each disk. The Iquerypv command directly queries the disk for its PVID, and is therefore able to display the correct PVID. Reference: IBM AIX v7 Administrator Specialty Study Guide, page 546.

The superstrict mirror write consistency policy is the most reliable policy for achieving data consistency between mirrors in AIX V7.2. This policy will maintain the data consistency between mirrors by writing the data to both mirrors before the write operation is acknowledged as complete. Reference: IBM AIX v7 Administration Specialty Study Guide (section 10.6.2, pp. 651-652).

The chvg command with the -t option is used to reduce the maximum number of physical volumes (PVs) allowed in a volume group (VG). This is necessary when the number of PVs in a VG exceeds the maximum allowed. Reference: IBM AIX v7 Administration Specialty Study Guide (section 10.3.3, pp. 641-642).

Thechvg -tcommand in AIX is used to change the factor by which the maximum number of physical partitions (PPs) per physical volume (PV) is increased. When this command is used to increase the maximum PPs, it allows more physical partitions on a physical volume, but it reduces the maximum number of physical volumes that can be included in the volume group. This is necessary when the required PPs exceed the current limit due to large disk sizes or large numbers of partitions.References: IBM AIX Documentation - chvg

"The command to limit root user access to only members of the group called system is chadmin group=system root. This command will set the primary group of the root user to the system group, thereby limiting root user access to only members of that group. This command can be used to set any user's primary group, not just root." The source of this information is the IBM AIX v7 Administrator Specialty Study Guide.