S1000-007 IBM AIX v7 Administrator Specialty Question and Answers

The umask value of 027 for the root user means that newly created files will have default permissions of 0640. This is because the umask value subtracts permissions from the default file mode (0666 for files). Specifically, 0666 (default) - 027 (umask) = 0640. This results in read and write permissions for the owner, and read permissions for the group.References:= IBM AIX Documentation

Thelparstat -icommand lists both the implemented and defined resources of a Logical Partition (LPAR). This includes information about the partition's processors, memory, and other resources, providing a comprehensive overview of the LPAR's configuration and resource allocation.References:= IBM AIX Documentation

Thelsfscommand in AIX gets its information from the/etc/filesystemsfile. This file contains definitions of all file systems and their attributes, including mount points, device names, and mount options. Thelsfscommand reads this information to display details about the file systems on the system.References:= IBM AIX Documentation

The error message indicating a refused connection operation suggests that thenimshsubsystem on the NIM client may not be active. The administrator should check the status of thenimshsubsystem and start it if necessary. This ensures that the NIM master can communicate with the client to perform software updates. The other options do not directly address the issue related to thenimshconnection.References:= IBM AIX Documentation

To make the paging spacepaging00active after the next reboot, thechpscommand is used. Thechps -a y paging00command will set the paging space to be automatically activated at boot time. This ensures that the paging space will be available and active after the system reboots.References:= IBM AIX Documentation

The default Maximum Transmission Unit (MTU) size of a network adapter in AIX is 1500 bytes. The MTU size determines the largest packet size that can be transmitted over the network. Setting an appropriate MTU size is essential for optimizing network performance and minimizing fragmentation.References:= IBM AIX Network Adapter Documentation

If a session hangs after entering the password, it is most likely due to problems with the authentication mechanism. This could be due to issues with the configuration of authentication services, network delays in authentication if using network-based authentication (such as LDAP), or misconfigurations in the PAM (Pluggable Authentication Module) settings. The other options, such as thepasswddaemon, full file systems, or network failures, are less likely to cause a login hang at this stage.References:= IBM AIX Documentation

Based on the output provided, the problem is that the/etc/netsvc.conffile has the wrong permissions. The/etc/netsvc.conffile is used to specify the order in which different name resolution services are used. If this file has incorrect permissions, non-root user processes may not be able to access it, leading to name resolution issues.References:= IBM AIX Documentation

AIX allows for the management of subsystems on remote systems through the System Resource Controller (SRC). This means that an administrator can issue commands to start, stop, or restart subsystems on remote AIX systems. Thesrcmstrprocess does not need to be halted to restart subsystems, and not all subsystems can be restarted using therefreshcommand.References:= IBM AIX Documentation

In the/etc/filesystemsfile, theautoattribute can be set tonoto prevent the automatic mounting of NFS filesystems during system startup. This ensures that the system does not attempt to mount NFS filesystems, thereby avoiding potential hangs during network outages.References:= IBM AIX Documentation

To create a file system with specific attributes such as logical volume name, disk location, and disk placement, the administrator should first use themklvcommand to create the logical volume with the desired properties. Then, thecrfscommand is used to create the file system on that logical volume. This pair of commands allows the administrator to set the required attributes during the creation process.References:= IBM AIX Documentation, IBM AIX Documentation

The procedure to check which system tunables have been changed in the system since last boot is to run the 'lstuncfg -1 | grep -v DEFAULT' command. The lstuncfg command is used to display the current configuration of the system tunables. By using the '-1' option, the command will display the system tunables and whether they have been changed since the last system reboot. The 'grep -v DEFAULT' command will filter out the default values, allowing you to see only the tunables that have been changed. This command is available on IBM AIX v7 systems and is documented in the IBM AIX v7 Administrator Specialty Study Guide. For more information, please see the IBM documentation at https://www.ibm.com/support/knowledgecenter/ssw_aix_72/com.ibm.aix.cmds2/lstuncfg.htm.

 Theyumtool can be used to simplify the installation of RPM packages by automatically resolving and installing prerequisite dependencies.yumis a package manager that handles the retrieval and installation of packages from repositories, making it easier to manage dependencies compared to manually using therpmcommand.References: IBM AIX Documentation – yum

CPU Entitlement is a setting in the LPAR profile that defines the amount of guaranteed CPU time allocated to an LPAR. This setting is important for workloads that require a steady level of performance, as it guarantees that the LPAR will always have access to a certain percentage of the processing power on the managed system. Reference: IBM AIX v7 Administrator Specialty Study Guide.

CPU Entitlement in AIX refers to the guaranteed amount of CPU time that is allocated to a logical partition (LPAR). It ensures that the LPAR receives a specific share of the processor resources, regardless of the load on the system. This setting is crucial for ensuring that critical applications have the necessary CPU resources to perform optimally. It is different from the total number of virtual CPUs configured, as it represents a minimum guarantee rather than the maximum potential CPU usage.References: IBM AIX Documentation - CPU Entitlement

The vmstat command is used to display the types, counts, and percentages of LPAR memory. The -v flag is used to display the virtual memory statistics, including the types and counts of memory. Reference: IBM AIX v7 Administrator Specialty Study Guide (page 6-17).

Thevmstat -vcommand in AIX provides a detailed report on memory usage, including the types, counts, and percentages of different memory components in the system. This includes information on virtual memory, paging space, and various other memory statistics, making it the appropriate command for assessing LPAR memory utilization.References: IBM AIX Documentation - vmstat

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

When an administrator encounters a "failure replaying log" error duringfsck, it indicates that the log device associated with the file system is corrupted. The next step is to format the log device using thelogformcommand. Runninglogform /dev/ulv11will reinitialize the log device, clearing any corruption and allowingfsckto proceed without errors. This process effectively resets the log, which is necessary for file system recovery.References: IBM AIX Documentation – logform

The root user is not required to run SMIT, and the size of the window is the only factor that determines the minimum output display requirements. According to the IBM AIX v7 Administrator Specialty Study Guide (page 9-3), SMIT requires 24 lines and 80 columns for the output display for successful execution.

The error message1800-005 SMIT requires a minimum of 24 line by 80 column output displayindicates that the terminal window does not meet the minimum size requirements for runningsmit. To resolve this, the user needs to resize their terminal window to at least 24 lines by 80 columns. Ensuring the terminal meets this size requirement will allowsmitto display its interface properly.References: IBM AIX Documentation – SMIT

Themlcvtermcommand is used to open a console to an AIX virtual machine that is controlled by a Hardware Management Console (HMC). According to the IBM AIX v7 Administrator Specialty Study Guide, themlcvtermcommand allows you to open a terminal window to the console of a logical partition (LPAR) running AIX.

In AIX, when creating a new user account without specifying a group, the default group assigned isstaff. This is a predefined group in AIX systems that is typically used for regular user accounts. It provides basic permissions and access suitable for non-administrative users.References: IBM AIX Documentation - User Management

Based on the output from thelparstatcommand, the partition has 8 logical processors configured. This is determined by the "Online Virtual CPUs" value, which shows 2, and the fact that the system is running in SMT-4 mode. Therefore, 2 Virtual CPUs x 4 (SMT threads per core) = 8 logical processors.References:= IBM AIX lparstat Command Documentation

The System Resource Controller (SRC) is the main process that starts other background processes when the system boots. It is started through the /etc/rc.srcmstr script which is run by the init process. This script reads the /etc/inittab file and starts the necessary processes. Reference: IBM AIX v7 Administrator Specialty Study Guide.

The System Resource Controller (SRC) in AIX is started by the script/etc/rc.srcmstr. This script initializes and starts the SRC daemon (srcmstr), which manages subsystems, subsystem groups, and subsystem processes. It is a critical part of the AIX startup process, ensuring that necessary systemservices are properly managed.References: IBM AIX Documentation - System Resource Controller

Devices that are connected to the system can be in one of four states.

Devices that are connected to the system can be in one of the following states:

Item

Description

Undefined

The device is unknown to the system.

Defined

Specific information about the device is recorded in the customized database, but it is unavailable to the system.

Available

A defined device is coupled to the operating system, or the defined device is configured.

Stopped

The device is unavailable but remains known by its device driver.

If a tty device and a printer alternately use the same tty connector, both a tty device and a printer are defined on the same parent and port in the device configuration database. Only one of these devices can be configured at a time. When the tty connector is configured, the printer specific setup information is retained until it isconfigured again. The device is not removed; it is in the defined state. Maintaining a device in defined state retains customized information for a device that is not currently in use, either before it is first made available or while it is temporarily removed from the system.

If a device driver exists for a device, the device can be made available through the device driver.

https://www.ibm.com/docs/en/aix/7.2?topic=nodes-device-states

This command will list all filesets that are below the AIX V7.2 technology level 4. The oslevel command is a useful tool for AIX administrators, as it allows them to list the installed technology levels and filesets. Other commands such as lslpp, lppchk, and instfix are not applicable to this task and will not provide the desired information.

For more information on the oslevel command, please refer to the IBM AIX v7 Administrator Specialty Study Guide, page 12-15. The guide can be found here:https://www.ibm.com/support/knowledgecenter/en/ssw_aix_72/os_upgrade/oslevel_command.htm.