Top 30 IBM AIX Interview Questions and Answers You Must Prepare

AIX is IBM’s UNIX Operating System built for Power Systems. It’s known for its stability, scalability and strong security. Its main features include:

1) Logical Partitions (LPARs)

2) Workload Partitions (WPARs)

3) System Management Interface Tool (SMIT)

4) Journaled File System 2 (JFS2)

5) Advanced performance tuning 

These features make it ideal for enterprise workloads. It’s designed for high availability and efficient Resource Management.

Here are the installation steps: 

1) Booting usually begins from DVD, NIM or VIOS as the installation source.

2) The installation menus guide the process step by step.

3) Disks are configured, and the required filesystems are selected.

4) Network settings are defined during setup.

5) System updates are applied once installation completes.

6) User accounts are configured as needed.

7) Final verification ensures the system is ready for use.

I’d focus on the following:

1) Hardening Secure Shell (SSH)

2) Enforcing strong passwords

3) Enabling Role-eased Access Control (RBAC)

4) Patching regularly

5) Using PowerSC

6) Monitoring logs

7) Restricting root access 

Additionally, auditing should always be enabled, network services should be minimised and firewalls must be configured properly. Basically, it's about reducing exposure and following IBM’s security guidelines closely.

Quorum can be enabled or disabled using smitty quorum or the chvg -Q command. Quorum controls how a volume group behaves when disks fail. Enabling quorum helps prevent corruption, while disabling it is handy for mirrored setups where surviving disks can still run safely.

AIX error logs classify events as:

1) Informational

2) Warning

3) Error

4) Fatal

Each level helps you understand system health and prioritise issues. errpt makes it easy to check what’s going on. Fatal errors are the most serious and usually indicate hardware or system-level problems.

Cloning rootvg is usually done with alt_disk_copy to another disk. It creates a bootable backup of your root volume group. It’s a neat way to test upgrades, patching or migration without touching the live system. The alternate disk can be rebooted whenever needed.

A logical volume can be mirrored using the mklvcopy command, followed by syncvg to synchronise the copies. After selecting the target disk, AIX handles the duplication automatically. This method improves redundancy and protects against disk failures. You can also use SMIT for a simplified, menu-based approach to mirroring logical volumes.

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The AIX record framework refers to how the system logs and manages structured operational data. Tools such as errpt, alog and syslog form part of this framework. It allows administrators to track errors, monitor performance, review boot logs and observe user activity in a consistent and organised manner.

Commands like netstat -rn, netstat -i, and netstat -p are the go-tos. We can also use lsattr, ifconfig and entstat for detailed interface stats. SMIT menus make this even easier if you prefer a guided approach rather than command-line options.

When we log in, AIX checks authentication, loads the environment, applies security rules and starts the shell. It reads files like /etc/profile and .profile. Once everything loads, we get the prompt. It’s similar to other UNIX systems but with stronger RBAC support.

'savebase' is used after making Object Data Manager (ODM) changes to make sure the system configuration gets written to the boot logical volume. It’s handy after hardware updates, device changes or network modifications. Running it ensures those settings survive a reboot and keep everything consistent.

'savebase' is used after making Object Data Manager (ODM) changes to make sure the system configuration gets written to the boot logical volume. It’s handy after hardware updates, device changes or network modifications. Running it ensures those settings survive a reboot and keep everything consistent.

We can identify the failing disk with errpt or lspv. The steps include: 

1) Unmirror or migrate data if needed

2) Remove it using reducevg or rmdev

3) Physically swap the hardware

4) Re-add the disk into the volume group

After that, we restore mirrors and run syncvg.

Mirroring simply means keeping multiple copies of your data on different disks, so that you’re protected against failures. AIX handles this at the logical volume level. If one disk fails, the system keeps running from the mirror. It’s a core high-availability feature.

There are plenty of examples including:

1) rootvg disk failures

2) Network interface drops

3) Filesystem full issues

4) LPAR performance slowdowns

5) NFS hangs

6) ODM corruption

Troubleshooting usually involves logs, errpt, lslv, topas, and sometimes rebooting into maintenance mode to fix deeper system problems.

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PowerSC is IBM’s security suite for Power Systems. It adds the following: 

1) Compliance checks

2) Real-time monitoring

3) Encryption

4) Patch automation

5) Virtualisation-aware protection

It basically gives AIX a strong security layer tailored for regulated environments like banking or healthcare.

AIX supports IPv6 through commands like ifconfig, SMIT and configuration files. We can assign IPv6 addresses, enable forwarding and configure routes just like IPv4. Applications and services on AIX are fully compatible, making migration pretty smooth for dual-stack environments.

Here are the key benefits of bash:

1) It provides command history for quick recall and reuse of previous commands

2) It offers powerful autocomplete that speeds up command entry

3) It supports functions and aliases to simplify repetitive tasks

4) It features cleaner, more readable scripting syntax

5) It's user-friendly compared to traditional shells like sh

6) It's highly portable across Linux and UNIX systems, including AIX

7) It's Widely used for automation, making it ideal for System Administration

We can bring up an interface using ifconfig en0 up, modify attributes with chdev or use smitty tcpip. After configuration, we have to verify using netstat or entstat. It’s pretty simple once the IP and gateway details are ready.

The Volume Group Descriptor Area (VGDA) stores the volume group’s metadata. The Volume Group Status Area (VGSA) tracks which data block copies are stale or in sync. Together, they help maintain the health and consistency of a volume group, especially when mirroring is used or when recovering from disk failures.

The default dump device in AIX is usually the primary paging space. You can check or change it using sysdumpdev -l. Many Admins configure a dedicated dump logical volume for reliability during crashes.

A Physical Partition (PP) in AIX is the smallest unit of storage allocation within a volume group. Logical volumes are constructed from multiple PPs that may be spread across different disks. PPs support efficient storage management, allow balanced data placement and enable redundancy. They also provide flexibility when resizing or reorganising logical volumes.

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T-Factor refers to how efficiently workloads run on IBM Power hardware compared to other platforms. It helps us estimate the consolidation capacity and performance gains when migrating applications to Power Systems.

1) Clear wipes the terminal screen

2) Echo prints text

3) Print is used in shell scripts

4) Banner displays large stylised text

They are simple but handy commands for scripting, messaging or making terminal output more readable.

Kerberos plays the following role in AIX authentication:

1) Kerberos adds secure, ticket-based authentication to AIX. 

2) It avoids sending passwords over the network and supports strong encryption. 

3) It’s especially useful in enterprise environments where centralised and secure identity management is essential.

Here are the key steps:

1) Install OpenSSH from the AIX Toolbox or use the bundled package.

2) Configure sshd settings according to security and access requirements.

3) Generate SSH keys and ensure correct file and directory permissions.

4) Restart the SSH service to apply changes.

5) Test connectivity to confirm the setup is working correctly and securely.

We can adjust VG attributes using chvg, like quorum settings, PP size or auto-varyon. SMIT is also great for this if you prefer menus. Most changes apply instantly and help fine-tune storage behaviour.

We can run lsattr -El hdiskX or lsvg vgname to check the Logical Track Group (LTG) size. It helps understand disk geometry and performance. It’s a small detail but important for tuning the storage. LTG values are especially useful when planning disk replacements or migrations.

ITM monitors AIX performance, resources, logs and applications. It helps track CPU, memory, storage, and network behaviour in real time. It’s great for troubleshooting and capacity planning, especially in big enterprise setups.

System Mirror helps create mirrored copies of rootvg to protect against disk failure. It’s easy through SMIT menus and keeps the system bootable even if one disk dies. It’s a must for high-availability environments.