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Top IBM AIX Interview Questions

1Q. How do I know if my volume group is normal, big, or scalable?

Ans: Run the lsvg command on the volume group and look at the value for MAX PVs. The value is 32 for normal, 128 for big, and 1,024 for the scalable volume group.

2Q. How do I create a volume group?


Use the following command, where partition_size sets the number of megabytes (MB) in each physical partition where the partition_size is expressed in units of MB from one through 1,024. (It’s one through 131,072 for AIX 5.3.)

mkvg -y name_of_volume_group -s partition_size list_of_hard_disks

The partition_size variable must be equal to a power of two (for example one, two, four, or eight). The default value for standard and big volume groups is the lowest value to remain within the limitation of 1,016 physical partitions per physical volume. The default value for scalable volume groups is the lowest value to accommodate 2,040 physical partitions per physical volume.

3Q. How can I change the characteristics of a volume group?

Ans: You use the chvg command to change the characteristics of a volume group.

4Q. How do I create a logical volume?

Ans: #mklv -y name_of_logical_volume name_of_volume_group number_of_partition

5Q. How do I increase the size of a logical volume?

Ans: To increase the size of the logical volume represented by the lv05 directory by three logical partitions, for example, type extendlv lv05 3.

6Q. How do I display all logical volumes that are part of a volume group (e,g, rootvg)?

Ans: You can display all logical volumes that are part of rootvg by typing the following command: #lsvg -l rootvg/

7Q. How do I list information about logical volumes?

Ans: Run the following command to display information about the logical volume #lv1: lslv lv1.

8Q. How can I clone the rootvg?

Ans: You can run the alt_disk_copy command to copy the current rootvg to an alternate disk. The following example shows how to clone the rootvg to hdisk1: alt_disk_copy -d hdisk1.

9Q. How do I replace a disk?


extendvg VolumeGroupName hdisk_new

migratepv hdisk_bad hdisk_new

reducevg -d VolumeGroupName hdisk_bad

10Q. How do I mirror a logical volume?


mklvcopy LogicalVolumeName Numberofcopies

syncvg VolumeGroupName

11Q. How can I display or set values for network parameters?

Ans: The no command sets or displays current or next boot values for network tuning parameters

12Q. How do I get the IP address of my machine?

Ans: Type one of the following: ifconfig -a or host Fully_Qualified_Host_Name. For example, host cyclop.austin.ibm.com.

13Q. How do I identify the network interfaces on my server?

Ans: Either of the following two commands will display the network interfaces: lsdev -Cc if or ifconfig -a. To get information about one specific network interface, for eaxample tr0, run the command ifconfig tr0.

14Q. How do I activate a network interface?


To activate the network interface tr0, run the command ifconfig tr0 up.

15Q. How do I display routing table, interface, and protocol information?

To display routing table information for an Internet interface, type netstat -r -f inet. To display interface information for an Internet interface, type netstat -i -f inet. To display statistics for each protocol, type netstat -s -f inet.

16Q. How will you create a file if a disk is given to you?


#mkvg –y datavg –s 128 hdisk1 (pv name)

#mklv -y datalv –t jfs2 datavg 1

#crfs –v jfs2 –d datalv –g datavg –a size=10M –m /fs1

17Q. Difference between JFS & JFS2?



JFS is normal filesystem. We cannot create large files in JFS.

Files can be accessed dynamically.

Max file system size=1TB

Max file size=64GB

Inode size=128b


Can create a large size filesystem.

Files can be accessed accordingly as required. (not randomly or sequentially)

Max files system size=4PB

Max file size=4PB

Inode size=512

17Q. How will you find the inode number?


# ls –li

# istat /etc/passwd

18Q. How will you find LTG size?


#lsvg vgname

#lquerypv –M hdiskname

19Q. How will you change LTG size?


#rmdev -l hdiskx

#chdev -l hdiskx -a max_transfer=0*80000

#mkdev -l hdiskx

20Q. How will you find whether a quorum is up or not?

Ans: # lsvg vg name

21Q. How to copy an LV from one VG to another?

Ans: # cplv -v

22Q. Mirroring concept?

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Check disk size belong to vg, take two same size disk to mirror

# bootinfo –s hdisk2

#lsvg –p rootvg

Add one more disk of the same size of already have disk having rootvg.

# extendvg rootvg hdisk2

# lsvg –p rootvg

Now mirror vg with background sync LV. It sync LVs in the background with new LVs

# mirrorvg –s rootvg

Create a boot image

# bosboot –ad /dev/hdisk2

#bosboot –ad /dev/hdisk1

Add a blv

record of the newly added disk, first check and then add.

# bootlist –m normal -o

#bootlist –m normal hdisk2 hdisk1

23Q. How will you unmirror a VG if a PV gets failed?


First check the blv record using,

# bootlist –m normal –o

Remove the old blv record, using

# chpv –c hdisk2

# bootlist –m normal hdisk1

# bootlist –m normal hdisk2

Now unmirrorvg

# unmirrorvg rootvg hdisk2

# reducevg rootvg hdisk2

#lsvg –p rootvg

# lspv

# bootlist –m normal –o

24Q. How will you change a PP size?

Ans: PP size can be changed using a T-factor. If not then add a partitions in VG by adding one disk.
# chvg –t3 rootvg

25Q. T – Factor?


T – factor means that it will change the pp size to increase the efficiency of vg
#chvg –t16 datavg
Cal-if suppose that datavg pp size is 1016 we can take t factor is 16 then it comes to 2048 and pv contains in vg is 2.

26Q. What is the default PP Size in AIX?

Ans: 128MB

27Q. How will you rename a VG?


Unmount all filesystems in VG.

# umount /test (mount point name)

#varyoffvg datavg

#exportvg datavg0

Importvg with new name

# importvg –y newvg hdisk4

28Q. What is major number?

Ans: A major number refers to a type of device. A device number is a major number, and a minor number specifies a particular device of that type or sometimes the operation mode of that device type.

29Q. What will you do if a disk gets failed?

Ans: diag command

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30Q. How to enable & disable quorum?


# chvg –vy pv_name

# chvg –vn pv_name

#chvg –Qn vgname

#chvg –Qs vgname

32Q. What are the error levels severity?


1. permanent

2. Temporary

3. Informational

4. Unknown.

33Q. What is the command to see the error log?


# errpt –a
# errpt –d H [H/W]
# errpt –d S [S/W]

34Q. What is the command to clear the errorlog?

Ans: # errclear

35Q. What is the command to increase the size of error log when it is ful?

Ans: #usr/lib/errdemon –s ____ [ size ]

36Q. What is the command to start , stop, restart and list a demon?


# startsrc –g [ Demon name ]
# stopsrc [Demon name ]
# refrest [Demon name ]
# lssrc –al

37Q. When does error demon start in boot process?

Ans: rc.boot phase 3

38Q. Which file that error daemon stay?

Ans: /usr/lib/errdemon

39Q. Two states of device availability and explain them?

Ans: Available state and defined state. When the device is in defined state it means it cannot use. Not in ready state. Run cfgmgr try to make available known in the system that device. Available state means that device is ready to use
# lsdev –Cc disk
It displays which disks are available

40Q. How will you check whether a device is installed or not?

# lsdev –Cc disk

41Q. How to change a 64 bit kernel to 32 bit kernel?


1. Modify the /usr/lib/boot/unix directory and the /unix directory to be a symbolic link to the binary for the desired kernel.
2. Run the bosboot command to write a new system boot image.
3. Reboot the system.
The path name of the 64-bit kernel is /usr/lib/boot/unix_64, and the
path name of the multiprocessor versions of the 32-bit kernel is
# ln -sf /usr/lib/boot/unix_mp /unix
# ln -sf /usr/lib/boot/unix_mp /usr/lib/boot/unix
# lslv -m hd5
# bosboot -ad /dev/ipldevice
# shutdown -Fr
# bootinfo -K (should now be 32)

42Q. How to change a 32 bit kernel to 64 bit kernel?


To truly change the kernel to 64-bit from 32-bit, the system must be at the AIX® 5.1 or AIX 5.2levels.
# bootinfo –y
It shows a kernel is either 32-bit or 64-bit.
To truly change the kernel to 64-bit from 32-bit, the system must be at the AIX® 5.1 or AIX 5.2levels.
# bootinfo –y
It shows a kernel is either 32-bit or 64-bit.
To change to a 64-bit kernel, enter the following commands:
# ln -sf /usr/lib/boot/unix_64 /unix
# ln -sf /usr/lib/boot/unix_64 /usr/lib/boot/unix
# lslv -m hd5
# bosboot -ad /dev/ipldevice
# shutdown -Fr

43Q. How many VGs can be created in a LVM?

Ans: 255 any no. of vg can create.

44Q. Types of VG & explain about them?


Normal vg -32 pv, 256 lv
# mkvg –y normvg –s 128 hdisk4
Big vg :- 128pv,512lv
# mkvg -B –y bigvg –s 128 hdisk9
Scalable vg: -1024pv, 4096 lv
# mkvg –S –y scalvg –s  512 hdisk1

45Q. How to convert a normal VG to big & scalable VG and also Big to Scalable VG?


#chvg –B vgname      /big vg
# chvg –S/-G vgname  /scale vg

46Q. What is VGDA, VGSA?


VGDA: Volume Group Descriptor Area. It contains the information about the volume group to which the physical volume belongs to. It also contains information about physical partitions, logical partitions, and logical volumes.
VGSA: Volume Group Status Area contains the information about physical partition from all physical volumes of the same volume group. It contains the status of VG

47Q. Default dump device?

Ans: hd6

48Q. Default secondary dump device?

Ans: /dev/sysdumpdevnull

49Q. How find a system dump?

Ans: #sysdumpdev -L

50Q. Where the file does the paging space stay?

Ans: /etc/swapspaces

51Q. How will check whether a fix is installed or not?

Ans: # instfix –ik  ptfname

52Q. What are the two states of installation?


Applied and commit state

In the applied state, if want to do any changes on installed software then we can do

But in the commit, the changes are not allowed to do. Once did the installation.

A committed fileset update cannot be rejected.

Output from the installp -s command, which is used to get a list of applied software fileset     updates and updates that are available to be either committed or rejected.

53Q. How will you reject a committed fileset?

Ans: # installp –r –g fileset name

54Q. How will you check whether service pack is installed or not?

Ans: # oslevel –s

55Q. What is the latest OS level?

Ans: #oslevel -rq

56Q. How will you check whether software is installed or not?

Ans: # lslpp -L |grep -i   (software_name)

57Q. How do you find history of a file set?

Ans: #lslpp –h

58Q. How to remove a failed package installation?

Ans: #installp -C

59Q. How do remove the entries of the device in the odm?

Ans: #rmdev -dl

60Q. What are the types of ODM Database ?


1. Pre-defined database PdDv, PdAt

2. Customised database CuDv, CuAt

61Q. ODM Commands.


odmcreate: To customize Odm

To remove ODM: odmdrop

odmdelete: To remove object from ODM

To see info in ODM  odmget

To change the fields in object class  odmchange

To add object to ODM  odmadd

62Q. Types of Installation?


1. New and complete overwrite

2. Migration

3. Preservation

63Q. Where does log files resides?

Ans: AIX logs messages as specified in /etc/syslog.conf file.

64Q. How to unlock user account?

Ans: chuser –a account=true username

65Q. How to lock a user’s account?

Ans: #chuser account_lock=true username

66Q. How do u take backup of file systems?

Ans: #backup -f /dev/rmt0

67Q. How will u restore a file from already take backup using backup?

Ans: #restore -xvqf /dev/rmt0

68Q. How will u append a file to a previous archive take by Tar?

Ans: #tar -rvf /dev/rmt0

69Q. What command to take backup other vg’s?

Ans: # savevg –if /dev/rmt0 /vgname

70Q. What command to restore backup of non – rootvg?

Ans: # restvg  –x –d –f /dev/rmt0

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