Create LVM in Linux x86_64

How To Create LVM Using vgcreate, lvcreate, and lvextend lvm2 Commands

LVM stands for Logical Volume Manager.

With LVM, we can create logical partitions that can span across one or more physical hard drives.
First, the hard drives are divided into physical volumes, then those physical volumes are combined
together to create the
volume group and finally the logical volumes are created from volume group.

PHDISK >> PHVolumn >> Virtual Group VG >> LV

Before we start, install the lvm2 package as shown below.

$ sudo apt-get intall lvm2

Select the Physical Storage Devices for LVM – Use pvcreate, pvscan, pvdisplay Commands

[root@LINUX ~]# pvscan
  PV /dev/sdb1   VG dbname          lvm2 [600.00 GB / 41.00 GB free]
  PV /dev/sda2   VG VolGroup00   lvm2 [29.88 GB / 0    free]
  Total: 2 [629.87 GB] / in use: 2 [629.87 GB] / in no VG: 0 [0   ]

fdisk -l
pvcreate /dev/sdb1



You can view the list of physical volumes with attributes like size, physical extent size, total physical extent size,
the free space, etc., using pvdisplay command as shown below.
[root@LINUX ~]#  pvdisplay
  --- Physical volume ---
  PV Name               /dev/sdb1
  VG Name               dbname
  PV Size               600.00 GB / not usable 3.93 MB
  Allocatable           yes
  PE Size (KByte)       4096
  Total PE              153599
  Free PE               10495
  Allocated PE          143104
  PV UUID               7CaKIx-3bE9-9FGy-DdlU-2flY-sew2-0Wgmek

  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               VolGroup00
  PV Size               29.90 GB / not usable 24.06 MB
  Allocatable           yes (but full)
  PE Size (KByte)       32768
  Total PE              956
  Free PE               0
  Allocated PE          956
  PV UUID               RpdbnameW-txLL-naS2-G3Xf-Pa3Y-fN8u-3zmKVT

Create the Volume Group – Use vgcreate, vgdisplay Commands

vgcreate dbname /dev/sdb1

[root@LINUX ~]# vgdisplay
  --- Volume group ---
  VG Name               dbname
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  6
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                4
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               600.00 GB
  PE Size               4.00 MB
  Total PE              153599
  Alloc PE / Size       143104 / 559.00 GB
  Free  PE / Size       10495 / 41.00 GB
  VG UUID               3P0SQ5-BtSD-lzDa-XeE3-sEid-guic-HTsiCj

  --- Volume group ---
  VG Name               VolGroup00
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  5
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                4
  Open LV               4
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               29.88 GB
  PE Size               32.00 MB
  Total PE              956
  Alloc PE / Size       956 / 29.88 GB
  Free  PE / Size       0 / 0
  VG UUID               ecNnL2-WsfQ-78Dn-Lr4R-lRYp-q5Ee-uIcJ4W

LVM Create: Create Logical Volumes – Use lvcreate, lvdisplay command
man lvcreate
lvcreate -n dbname-oraredo2 -L 2g dbname
lvcreate -n dbname-flashback -L 2g dbname
lvcreate -n dbname-oradata1 -L 388g dbname
lvextend -L+22G /dev/dbname/dbname-flashback

[root@LINUX ~]# lvdisplay
  --- Logical volume ---
  LV Name                /dev/dbname/dbname-oraredo2
  VG Name                dbname
  LV UUID                fT0MIr-Bls6-51iq-emPx-Qf42-pnvk-0iwaNk
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                2.00 GB
  Current LE             512
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:4

  --- Logical volume ---
  LV Name                /dev/dbname/dbname-flashback
  VG Name                dbname
  LV UUID                c18sq1-3UMs-xOGt-d9al-y2D5-ohXh-ORU8Ai
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                24.00 GB
  Current LE             6144
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:5

  --- Logical volume ---
  LV Name                /dev/dbname/dbname-oradata1
  VG Name                dbname
  LV UUID                0EqjlW-A1P3-5837-PuvV-E1dC-TseI-yA7CA8
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                388.00 GB
  Current LE             99328
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:6

  --- Logical volume ---
  LV Name                /dev/dbname/orasoft
  VG Name                dbname
  LV UUID                yuEZI6-ZTUy-GQze-rVz0-67La-7zSu-apuVQK
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                145.00 GB
  Current LE             37120
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:7

  --- Logical volume ---
  LV Name                /dev/VolGroup00/LogVol00
  VG Name                VolGroup00
  LV UUID                hA44xM-pgKG-1HCa-mvLa-JOew-FPYh-pxNT4w
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                7.00 GB
  Current LE             224
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

  --- Logical volume ---
  LV Name                /dev/VolGroup00/LogVol02
  VG Name                VolGroup00
  LV UUID                etRJ9K-0Je9-2DGu-dulU-eiIF-WDzh-ssJHB1
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                7.00 GB
  Current LE             224
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

  --- Logical volume ---
  LV Name                /dev/VolGroup00/LogVol03
  VG Name                VolGroup00
  LV UUID                2npFKh-0kJ4-QAQ2-0MhJ-VCRs-vN2y-LpixJh
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                13.88 GB
  Current LE             444
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:2

  --- Logical volume ---
  LV Name                /dev/VolGroup00/LogVol01
  VG Name                VolGroup00
  LV UUID                Ss2TiB-ps4H-tTWw-pvPJ-nadh-MhxY-xm06i3
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                2.00 GB
  Current LE             64
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:3

After creating the appropriate filesystem on the logical volumes, it becomes ready to use for the storage purpose.

mkfs -t ext3 /dev/dbname/dbname-flashback
mkfs -t ext3 /dev/dbname/dbname-oradata2
mkfs -t ext3 /dev/dbname/dbname-oradata1

mkdir -p  /dbname/dbnameproddb/oraredo2
mkdir -p  /dbname/dbnameproddb/flashback
mkdir -p  /dbname/dbnameproddb/oradata1
mount /dev/dbname/dbname-flashback /dbname/dbnameproddb/flashback
mount /dev/dbname/dbname-oradata1 /dbname/dbnameproddb/oradata1
df -h
mount -t ext3 /dev/dbname/dbname-flashback /dbname/dbnameproddb/flashback
more /etc/fstab
man mkfs
lvs
mkfst -t ext3 /dev/dbname/dbname-flashback
mkfs -t ext3 /dev/dbname/dbname-flashback
mount  /dev/dbname/dbname-flashback /dbname/dbnameproddb/flashback
mkfs -t ext3 /dev/dbname/dbname-oradata1
mount  /dev/dbname/dbname-oradata1 /dbname/dbnameproddb/oradata1
mkfs -t ext3 /dev/dbname/dbname-oradata2
lvs
 mkfs -t ext3 /dev/dbname/dbname-oraredo2
mount  /dev/dbname/dbname-dbname-oraredo2  /dbname/dbnameproddb/oraredo2
mount /dev/dbname/dbname-oraredo2 /dbname/dbnameproddb/oraredo2


[root@LINUX ~]# mount  /dev/dbname/dbname-flashback /dbname/dbnameproddb/flashback
[root@LINUX ~]# mount /dev/dbname/dbname-oraredo2 /dbname/dbnameproddb/oraredo2
  mount /dev/dbname/dbname-oradata1 /dbname/dbnameproddb/oradata1
                   mount /dev/dbname/orasoft /dbname/prod/orasoft
/dev/mapper/dbname-dbname--flashback
                      24770940    176200  23336452   1% /dbname/dbnameproddb/flashback
/dev/mapper/dbname-dbname--oraredo2
                       2064208     68680   1890672   4% /dbname/dbnameproddb/oraredo2
/dev/mapper/dbname-dbname--oradata1
                     400463896 158907264 221214260  42% /dbname/dbnameproddb/oradata1
/dev/mapper/dbname-orasoft
                     149657900  20823352 121232372  15% /dbname/prod/orasoft