How to extend file system by adding a new disk

add disk to the vm
check disk is detected by

# fdisk -l

e.g. new disk /dev/sdb added without partition table

create physical volume from physical disk device /dev/sda1
we are using the whole disk => delete any partition table in it by

Create PV

# pvcreate /dev/sdb

# pvs
PV         VG         Fmt Attr PSize PFree
/dev/sda2 VolGroup00 lvm2 a-   49.88G     0
/dev/sdb              lvm2 a-   50.00G 50.00G    <==

Extend VG

# vgextend VolGroup00 /dev/sdb
Volume group "VolGroup00" successfully extended

# vgs
VG         #PV #LV #SN Attr   VSize VFree
VolGroup00   2   2   0 wz--n- 99.84G 49.97G

Extend LV

Before extending the LV, status is

# lvs
LV       VG         Attr   LSize Origin Snap% Move Log Copy% Convert
LogVol00 VolGroup00 -wi-ao 45.97G
LogVol01 VolGroup00 -wi-ao 3.91G

# lvdisplay /dev/VolGroup00/LogVol00

--- Logical volume ---
LV Name                /dev/VolGroup00/LogVol00
VG Name                VolGroup00
LV UUID                lCQ3pw-cPTl-D4Dq-JRTA-cf9J-OeZS-qb17ER
LV Write Access        read/write
LV Status              available
# open                 1
LV Size                45.97 GB
Current LE             1471
Segments               1
Allocation             inherit
Read ahead sectors     auto
- currently set to     256
Block device           253:0

extend it

# lvextend -L +49G /dev/VolGroup00/LogVol00

After extending the LV, status is

[root@vbRH57 ~]# lvdisplay /dev/VolGroup00/LogVol00
--- Logical volume ---
LV Name                /dev/VolGroup00/LogVol00
VG Name                VolGroup00
LV UUID                lCQ3pw-cPTl-D4Dq-JRTA-cf9J-OeZS-qb17ER
LV Write Access        read/write
LV Status              available
# open                 1
LV Size                94.97 GB
Current LE             3089
Segments               2
Allocation             inherit
Read ahead sectors     auto
- currently set to     256
Block device           253:0

Resize the filesystem to use the available space

# resize2fs /dev/VolGroup00/LogVol00