S1000-007 IBM AIX v7 Administrator Specialty Questions and Answers

The/etc/security/userfile contains user attributes and can be configured to disable direct root login. Specifically, therloginattribute can be set tofalsefor the root user, which would disable direct remote login for the root account.References:= IBM AIX Documentation

Thelslppcommand lists the installed filesets and can be used to verify if a specific interim fix has been installed by checking the fileset version. Theemgrcommand is used to manage interim fixes (emergency fixes) on AIX, including listing installed interim fixes, which helps in determining if a specific fix has been applied.References:= IBM AIX Documentation, IBM AIX Documentation

Thesmit.scriptfile records all commands executed through SMIT (System Management Interface Tool). By checking this file, the administrator can find the exact command that was run previously. This log file is useful for auditing and replicating commands executed via SMIT.References:= IBM AIX Documentation

Thealogcommand is used to view the AIX boot log. This command accesses the boot log file, which contains messages and information about the boot process. The boot log helps administrators troubleshoot and understand the sequence of events during system startup.References:= IBM AIX alog Command Documentation

When a file system corruption error is reported in the system error log, the appropriate action is to check the error log for specific details, unmount the affected file system, and run thefsck(file system check) command. This command checks and repairs inconsistencies and errors in the file system, which can help resolve the corruption issue. It is essential to unmount the file system before runningfsckto avoid further data corruption.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

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

After creating an additional filesystem using thecrfs -g rootvgcommand, themklvcopycommand should be run to mirror the corresponding logical volume. This command creates additional copies of the logical volume, ensuring that the mirroring is completed.References:= IBM AIX Mirroring 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

Thelparstat -icommand provides detailed information about the logical partition, including whether it is using shared or dedicated processor resources. This command displays the partition's configuration, processor mode, and other relevant details that help the administrator determine the resource-sharing status.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

Thecrusuer sugroups=system rootcommand limits root user access to only members of the group calledsystem. This command sets the secondary groups (sugroups) for the root user to include only thesystemgroup, thereby restricting root access to users within that group.References:= IBM AIX Security Documentation

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.

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 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 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.

Thenimclientcommand on the AIX client system can be used to rebuild the/etc/niminfofile. This command allows the client to reinitialize its configuration and communicate with the NIM master to recreate the necessary configuration file.References:= IBM AIX NIM Documentation

"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.

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.

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

The cfgmgr command updates the system configuration database with the current configuration of the devices attached to the system. When the SAN administrator increases the size of a LUN device (hdisk), it is not automatically reflected on the AIX LPAR. Running the cfgmgr command updates the system with the new size information and makes it visible to the system administrator.

The istat command displays information about the inode of a file, including the last access time. This command is available on IBM AIX v7 systems and is documented in the IBM AIX v7 Administrator Specialty Study Guide. The syntax for the command is "istat file", where 'file' is the path to the file you would like to check. For more information, please see the IBM documentation at https://www.ibm.com/support/knowledgecenter/ssw_aix_72/com.ibm.aix.cmds2/istat.htm.

Theistatcommand in AIX provides detailed information about a file's inode, including the last access time, modification time, and change time. This command is useful for administrators who need to track file usage and access patterns. By runningistat file, one can see when a file was last accessed.References: IBM AIX Documentation – istat

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 mkps command creates a paging space and activates it when the system is rebooted. This is explained in the IBM AIX v7 Administrator Specialty Study Guide, under the topic "Creating and Activating a Paging Space".