Create PVs and VG

lvm.sh

[root@localhost ~]# ls /dev/sd*
/dev/sda  /dev/sda1  /dev/sda2  /dev/sdb
[root@localhost ~]# fdisk /dev/sdb

Welcome to fdisk (util-linux 2.27).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): n
Partition type
   p   primary (0 primary, 0 extended, 4 free)
   e   extended (container for logical partitions)
Select (default p): p
Partition number (1-4, default 1): 
First sector (2048-16777215, default 2048): 
Last sector, +sectors or +size{K,M,G,T,P} (2048-16777215, default 16777215): +3G

Created a new partition 1 of type 'Linux' and of size 3 GiB.

Command (m for help): n
Partition type
   p   primary (1 primary, 0 extended, 3 free)
   e   extended (container for logical partitions)
Select (default p): p
Partition number (2-4, default 2): 
First sector (6293504-16777215, default 6293504): 
Last sector, +sectors or +size{K,M,G,T,P} (6293504-16777215, default 16777215): +2G

Created a new partition 2 of type 'Linux' and of size 2 GiB.

Command (m for help): n
Partition type
   p   primary (2 primary, 0 extended, 2 free)
   e   extended (container for logical partitions)
Select (default p): p
Partition number (3,4, default 3): 
First sector (10487808-16777215, default 10487808): 
Last sector, +sectors or +size{K,M,G,T,P} (10487808-16777215, default 16777215): 

Created a new partition 3 of type 'Linux' and of size 3 GiB.

Command (m for help): p
Disk /dev/sdb: 8 GiB, 8589934592 bytes, 16777216 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x411cd82c

Device     Boot    Start      End Sectors Size Id Type
/dev/sdb1           2048  6293503 6291456   3G 83 Linux
/dev/sdb2        6293504 10487807 4194304   2G 83 Linux
/dev/sdb3       10487808 16777215 6289408   3G 83 Linux

Command (m for help): t
Partition number (1-3, default 3): 1
Partition type (type L to list all types): 8e

Changed type of partition 'Linux' to 'Linux LVM'.

Command (m for help): t
Partition number (1-3, default 3): 2
Partition type (type L to list all types): 8e

Changed type of partition 'Linux' to 'Linux LVM'.

Command (m for help): t
Partition number (1-3, default 3): 
Partition type (type L to list all types): 8e

Changed type of partition 'Linux' to 'Linux LVM'.

Command (m for help): p
Disk /dev/sdb: 8 GiB, 8589934592 bytes, 16777216 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x411cd82c

Device     Boot    Start      End Sectors Size Id Type
/dev/sdb1           2048  6293503 6291456   3G 8e Linux LVM
/dev/sdb2        6293504 10487807 4194304   2G 8e Linux LVM
/dev/sdb3       10487808 16777215 6289408   3G 8e Linux LVM

Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.

[root@localhost ~]# ls /dev/sd*
/dev/sda  /dev/sda1  /dev/sda2  /dev/sdb  /dev/sdb1  /dev/sdb2  /dev/sdb3
[root@localhost ~]# vgcreate mygroup /dev/sdb1 /dev/sdb2 /dev/sdb3
  Volume group "mygroup" successfully created
[root@localhost ~]# vgs
  VG      #PV #LV #SN Attr   VSize VFree
  fedora    1   2   0 wz--n- 9.51g    0 
  mygroup   3   0   0 wz--n- 7.99g 7.99g
[root@localhost ~]# pvs
  PV         VG      Fmt  Attr PSize PFree
  /dev/sda2  fedora  lvm2 a--  9.51g    0 
  /dev/sdb1  mygroup lvm2 a--  3.00g 3.00g
  /dev/sdb2  mygroup lvm2 a--  2.00g 2.00g
  /dev/sdb3  mygroup lvm2 a--  3.00g 3.00g
[root@localhost ~]# vg
vgcfgbackup    vgchange       vgconvert      vgdisplay      vgextend       vgimportclone  vgmknodes      vgremove       vgs            vgsplit        
vgcfgrestore   vgck           vgcreate       vgexport       vgimport       vgmerge        vgreduce       vgrename       vgscan         
[root@localhost ~]# vgdisplay mygroup
  --- Volume group ---
  VG Name               mygroup
  System ID             
  Format                lvm2
  Metadata Areas        3
  Metadata Sequence No  1
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                0
  Open LV               0
  Max PV                0
  Cur PV                3
  Act PV                3
  VG Size               7.99 GiB
  PE Size               4.00 MiB
  Total PE              2045
  Alloc PE / Size       0 / 0   
  Free  PE / Size       2045 / 7.99 GiB
  VG UUID               34YPe9-JzR1-oHF5-ZOyn-nc6S-tUuw-akUmRe