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IBM AIX Interview Questions with Answers

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

> How do I activate a network interface ?
To activate the network interface tr0, run the command ifconfig tr0 up.

> 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.

> 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

> Difference between JFS & JFS2 ?

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

Files can be access dynamically.

Max file system size=1TB

Max file size=64GB

Inode size=128b


Can create a large size filesystems.

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

Max files system size=4PB

Max file size=4PB

Inode size=512

> How will you find the inode number ?
# ls –li

# istat /etc/passwd

> How will you find LTG size ?
#lsvg vgname

#lquerypv –M hdiskname

> How will you change LTG size ?
#rmdev -l hdiskx

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

#mkdev -l hdiskx

> How will you find whether a quorum is up or not ?
# lsvg vg name

> How to copy a LV from one VG to another ?
# cplv -v <new vg name> <sourcelvname>

> Mirroring concept ?
Check disk size belong to vg , take two same size disk to mirror
# bootinfo –s hdisk2
#lsvg –p rootvg
Add one more disk of 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 background with new LVs
# mirrorvg –s rootvg
Create a boot image
# bosboot –ad /dev/hdisk2
#bosboot –ad /dev/hdisk1
Add a blv
record of newly added disk, first check and then add.
# bootlist –m normal -o

#bootlist –m normal hdisk2 hdisk1

> 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

> How will you change a PP size ?
PP size can be changed using a T-factor. If not then add a partitions in VG by adding one disk.

# chvg –t3 rootvg

> 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.

> What is the default PP Size in AIX ?


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