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Latest AIX Interview Questions with Answers

> 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

> What is major number ?
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.

> What will you do if a disk gets failed ?
diag command

> How to enable & disable quorum ?
# chvg –vy pv_name

# chvg –vn pv_name

#chvg –Qn vgname

#chvg –Qs vgname

> What are the types of error ?
a.H/W error
b. S/W error
c. Operator error
d. Unknown error.

> What are the error levels severity ?
a. permanent
b. Temporary
c. Informational
d. Unknown.

> What is the command to see the error log ?
# errpt –a
# errpt –d H [H/W]
# errpt –d S [S/W]

> What is the command to clear the errorlog ?
# errclear

> What is the command to increase the size of error log when it is full ?
#usr/lib/errdemon –s ____ [ size ]

> What is the command to start , stop, restart and list a demon ?
# startsrc –g [ Demon name ]

# stopsrc [Demon name ]

# refrest [Demon name ]

# lssrc –al

> When does error demon start in boot process ?
rc.boot phase 3

> Which file that error daemon stay ?
/usr/lib/errdemon

> Two states of device availability and explain them ?
Available state and defined state. When 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

> How will you check whether a device is installed or not ?
# lsdev –Cc disk

> 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
/usr/lib/boot/unix_mp.
# 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)

> 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

> How many VGs can be created in a LVM ?
255 any no. of vg can create.

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