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Latest AIX Interview Questions with Answers

> 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

> 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

> What is VGDA, VGSA ?
VGDA: Volume Group Descriptor Area. It contains the information about volume group to which the physical volume belongs to. It also contains the information about physical partitions, logical partitions and logical volumes.

VGSA: Volume Group Status Area it contains the information about physical partition from all physical volumes of the same volume group. It contains the status of VG

> Default dump device ?
hd6

> Default secondary dump device ?
/dev/sysdumpdevnull

> How find a system dump ?
#sysdumpdev -L

> Where the file does the paging space stay ?
/etc/swapspaces

> How will check whether a fix is installed or not ?
# instfix –ik ptfname

> What are the two states of installation ?
Applied and commit state

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

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

> How will you reject a committed fileset ?
# installp –r –g fileset name

> How will you check whether service pack is installed or not ?
# oslevel –s

> What is the latest OS level ?
#oslevel -rq

> How will you check whether software is installed or not ?
# lslpp -L |grep -i (software_name)

> How do you find history of a file set ?
#lslpp –h

> How to remove a failed package installation ?
#installp -C

> How do remove the entries of the device in the odm ?
#rmdev -dl

> What are the types of ODM Database ?
Pre-defined database PdDv, PdAt
Customised database CuDv, CuAt

> 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

> Types of Installation ?
New and complete overwrite

Migration

Preservation

> Where does log files resides ?
AIX logs messages as specified in /etc/syslog.conf file.

> How to unlock user account ?
chuser –a account=true username

> How to lock a user's account ?
#chuser account_lock=true username

> How do u take backup of file systems ?
#backup -f /dev/rmt0

> How will u restore a file from already take backup using backup ?
#restore -xvqf /dev/rmt0

> How will u append a file to a previous archive take by Tar ?
#tar -rvf /dev/rmt0

> What command to take backup other vg's ?
# savevg –if /dev/rmt0 /vgname

> What command to restore backup of non – rootvg ?
# restvg –x –d –f /dev/rmt0

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