Some useful commands and interview questions with answer :)

How to create pvid on the hdisk6?
    unix4you# chdev –l hdisk6 –a pv=yes
2.    How to clear pvid on the hdisk6?
    unix4you# chdev –l hdisk6 –a pv=clear
3.    How to see summary of the hdisk2 as well as the pvid?
    unix4you# lspv hdisk2
4.    How to see Pp distribution on the hdisk2?
    unix4you# lspv –p hdisk2
5.    How to create Vg ?
    unix4you# mkvg –y datavg –s 64 hdisk2 hdisk3
6.    How to list logical volume in vg?
    unix4you# lsvg –l rootvg
7.    Detail information of datavg
    unix4you# lvg datavg
8.    How to list vg to know disk and distribution?
    unix4you# lsvg –p datavg
9.    How to extend datavg ? Or how to add disk into datavg?
    unix4you# extendvg datavg hdisk2
10.    How to remove disk from vg ?
    unix4you# reducevg datavg hdisk2
11.    How to migrate data from hdisk4 to hdisk2 and hdisk 1
    unix4you# migratepv hdisk4 hdisk2 hdisk1
12.    How to close volume group?
    unix4you# varyoffvg datavg
13.    How to open the volume group?
    unix4you# varryonvg datavg
14.    How to create the logical volume?
    unix4you# mklv –y lv05 –c 2 datavg 20
15.    How to remove logical volume ?
    unix4you# rmlv lv06
16.    How to extend logical volume ?
    unix4you# extendlv lv06 20

17.    How to create file system ?
    unix4you# crfs –v  jfs/jfs2 –g [vg_name –a size=] Or –d lv_name – m mount_point
    unix4you# mkfs –v jfs/jfs2  /dev/vl06
18.    How to change the file system size?
    unix4you# chfs –a size=+64M /data
    unix4you# chfs –a size=-64M /data
19.    How to list all file system?
    unix4you# lsfs
20.    How to list all jfs file system?
    unix4you# lsfs –v jfs
21.    How to cop to a new LV called "NeWLogicalVolume"                   
    unix4you# cplv -v VolumeGroup -y NewLogicalVolume SourceLogicalVolume        
22.    How to copy lv to existing lv ?
    unix4you# cplv -e DestinationLogicalVolume SourceLogicalVolume
23.    How to close the physical volume ?
    unix4you# chpv –v r hdisk2
24.    How to open the physical volume?
    unix4you# chpv –v a hdisk2
25.    How to clear boot record on the physical volume?
    unix4you# chpv –c hdisk2
26.    How to disable the quorum ?
    unix4you# chvg –Qn datavg
27.    How to enable the quorum?
    unix4you# chvg –Qy datavg