S1000-007 IBM AIX v7 Administrator Specialty Questions and Answers

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

The commandprtconfprovides detailed information about the configuration of a running partition, including the configured devices. This command outputs the current state of the system, making it useful for administrators to retrieve configuration details.References:= IBM AIX prtconf Command Documentation

The two connection methods supported for a NIM master to initiate operations on a NIM client arenimshandrsh. Thenimsh(NIM shell) is a secure and efficient method, whilersh(remote shell) is an older, less secure method. Both are used for remote command execution and communication between the NIM master and clients.References:= IBM AIX NIM Documentation

Theprintqaccount is associated with printing capabilities in AIX. If the new system does not require any printing capabilities, theprintqaccount can be safely removed from the system.References:= IBM AIX User Account Management Documentation

To upgrade from one release of AIX to another (such as from AIX 7.1 to AIX 7.2), the recommended method is a Migration Install. This method allows the administrator to upgrade the operating system while preserving existing data and settings. It updates the existing AIX installation to the new version, ensuring compatibility and continuity of system configurations and installed applications. The other methods, such as Preservation Install, New and Complete Overwrite Install, and Update Install, are either not suitable for upgrading to a new release or would result in data loss or incomplete updates.References:= IBM AIX Documentation

Theno -acommand in AIX displays the current values of all network options, including those related to TCP/IP packet routing. This command helps the administrator to verify if the system is configured for packet routing across multiple networks. The other commands listed do not provide information related to TCP/IP packet routing settings.References:= IBM AIX Documentation

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

To prevent the telnet daemon from running and restarting after a reboot, the administrator should comment out the line related to telnet in the/etc/inetd.conffile by inserting a#at the beginning of the line. After making this change, running therefresh -s inetdcommand will apply the changes to theinetdservice without requiring a system reboot. This effectively disables the telnet service.References:= IBM AIX Documentation

Thevmstat -scommand in AIX displays various system statistics since the last reboot, including the cumulative count of paging space page outs and free frame waits. This command provides detailed system performance information, which helps in diagnosing memory and paging issues. Other commands listed, such asps guw,svmon -G, andioo -L, do not provide cumulative counts of these specific metrics.References:= IBM AIX Documentation

The account name "adm" is a standard account that comes pre-installed with AIX. It is used for system administration tasks and has specific roles and permissions associated with it. Attempting to create a new account with the same name would conflict with the existing standard account, hence it cannot be used for creating a new user account.References:= IBM AIX Documentation

To unconfigure a device and remove its definition from the Customized Devices object class in AIX, the commandrmdev -dl rmtOis used. The-doption indicates the removal of the device definition, and the-loption specifies the logical name of the device. This command ensures that both the device configuration and its definition are deleted from the system.References:= IBM AIX Documentation

In AIX, console log messages are recorded using thealogcommand. Thealogutility manages log files, including the console log, which captures system messages and output sent to the console. This utility provides a means to view and manage these logs for diagnostic and auditing purposes.References: IBM AIX Documentation – alog

 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

Thevtmenucommand in an HMC SSH session is used to display a menu of all managed systems and their LPARs. This menu provides options to open virtual terminal sessions to these LPARs, making it easy for administrators to monitor the boot process and manage their AIX partitions. Other commands likemkvtermopen a console for a specific partition, butvtmenuis designed to list all and provide an interface for selection.References: IBM HMC Documentation

When using the connect=shell option, a successful NIM operation requires that the root user on the NIM client has an entry in its .rhosts file for the NIM master, and that the file permissions are set to 600. This is documented in the IBM AIX v7 Administrator Specialty Study Guide. More information on this can be found at https://www.ibm.com/support/knowledgecenter/en/ssw_aix_72/com.ibm.aix.security/nim_security.htm.

The root account is the special user in the /etc/passwd file with the user ID (UID) of 0 and is commonly given the user name, root. It is not the user name that makes the root account so special, but the UID value of 0. This means that any user that has a UID of 0 also has the same privileges as the root user. Also, the root account is always authenticated by means of the local security files.

https://www.ibm.com/docs/en/aix/7.2?topic=passwords-root-account

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 command used to monitor SAN I/O performance/throughput is iostat -DIRT 60 10. The iostat command is used to monitor I/O performance and throughput on a SAN device. The DIRT (Disk I/O Response Time) flag can be used to display the response time for each I/O request. The last two arguments, 60 and 10, are the interval (in seconds) and the number of iterations respectively. This command will monitor I/O performance/throughput every 60 seconds for 10 iterations.

The shutdown command is used to shut down a system in an orderly manner. When used with the '-Fr' option, it will perform a graceful shutdown and reboot of the LPAR. This command is available onIBM AIX v7 systems and is documented in the IBM AIX v7 Administrator Specialty Study Guide. The syntax for the command is "shutdown -Fr", where the '-F' option indicates that the system should be rebooted after shutdown and the '-r' option indicates that the system should be rebooted. For more information, please see the IBM documentation at https://www.ibm.com/support/knowledgecenter/ssw_aix_72/com.ibm.aix.cmds3/shutdown.htm.

Theshutdowncommand is used to perform a graceful shutdown and reboot of an AIX LPAR. This command ensures that all processes are properly terminated, filesystems are synced, and the system is cleanly brought down before rebooting. It is preferred overhaltandrebootbecause it allows for a controlled and orderly shutdown process.References: IBM AIX Documentation – shutdown

The IBM AIX Toolbox for Linux Applications provides a collection of open-source software packages that can be installed on AIX systems. However, IBM does not offer standard or extended support for these open-source packages. The software is provided as-is, meaning that users can utilize the software but are responsible for managing and troubleshooting it without official support from IBM.References: IBM AIX Toolbox for Linux Applications

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 two additional commands that an AIX V7.2 administrator should run after mirroring the rootvg with the mirrorvg command are 'bosboot' and 'bootlist'. The bosboot command is used to update the boot image on all disks in the volume group, and the bootlist command is used to set the boot order for the system. These commands are available on IBM AIX v7 systems and are 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.cmds3/bosboot.htm  and https://www.ibm.com/support/knowledgecenter/ssw_aix_72/com.ibm.aix.cmds3/bootlist.htm.

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 "lslpp" command can be used to display information about filesets installed on an AIX system. To determine which files are included in the "useful_fileset" fileset, the administrator can run the following command:

lslpp -f useful_fileset

This command will display detailed information about the "useful_fileset" fileset, including a list of the files that are included in the fileset. This information can be useful for verifying the installation of the fileset and for troubleshooting problems that may be related to the fileset.