S2000-025 IBM AIX v7.3 Administrator Specialty Practice Questions

In vmstat output, the wa column represents the percentage of time the CPU was idle while waiting for disk I/O operations to complete. A consistently high value in this column is a classic indicator that the system's performance is being limited by slow storage subsystem performance, creating a disk I/O bottleneck.

The lparstat output shows high CPU usage (%entc is 92.5) and that the LPAR is consuming 1.85 physical CPUs (physc). The key information is from mpstat, which shows an imbalanced load across logical CPUs. With SMT-4 on 2 physical CPUs, there are 8 logical CPUs. The fact that only four are busy indicates the application likely has a limited number of threads that are saturating the logical CPUs they are running on, while the other logical CPUs remain idle. This points to an application scaling or threading issue, not a system-wide resource exhaustion.

This statement is false. The roles are reversed: no (Network Options) is used for network-related tunables. vmo (Virtual Memory Options) is used for VMM tunables like minperm and maxperm.

The LED code 553 specifically points to a failure during the boot process where the init process cannot be started because it cannot mount the root (/) or /usr file systems. This is often caused by file system corruption, an incorrect entry in /etc/filesystems, or a problem with the underlying logical volumes.

The po column in vmstat represents pages paged out to the paging space, while the fr column shows free memory pages. A consistently high po value indicates that the Virtual Memory Manager (VMM) is frequently writing memory pages to disk. A low fr value confirms that there is little free RAM available. This combination is a classic sign of memory pressure, where the system's physical RAM is insufficient for the current workload, leading to heavy reliance on the much slower paging space.

AIX 7.3 and later versions increasingly rely on YUM (or its successor DNF) to manage open-source RPM packages. These tools are designed to automatically resolve and install dependencies from configured repositories, which is the most efficient and reliable method. Manually installing dependencies is tedious and error-prone. The installp command is for AIX-native packages, not RPMs.

The chdev command is used to modify device attributes. By default, it only changes the running configuration. To make the change permanent so that it is applied after a reboot, the -P flag must be used. This flag updates the device's attributes in the Object Data Manager (ODM) database.

The /etc/inittab file is the primary control file for the init process, defining which processes and scripts to run at different run levels during system startup.

The /etc/inittab file often calls scripts located in the /etc/rc.d/ directory structure (like /etc/rc.d/rc2.d/) to start and stop services for a specific run level. A faulty script here is a common cause of boot hangs.

This solution correctly maps each requirement to the appropriate AIX tool: mksysb is for creating a bootable OS backup (Req 1). savevg is designed for backing up non-root volume groups (Req 2). snap -a gathers comprehensive system configuration data for reporting (Req 3). cron is the standard utility for automating recurring tasks (Req 4).

The -f (force) flag with stopsrc sends a SIGKILL (kill -9) signal to the subsystem process but does so under the control of the SRC. This ensures that the SRC updates its status for the subsystem to 'inoperative' and performs necessary cleanup. This is the preferred method over using a manual kill -9, which would leave the SRC with an incorrect status for the subsystem.