16 creating LVM

By OK -
to create a logic volume, you start by creating a partition

[root@localhost /]# fdisk /dev/sdb
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): p

Disk /dev/sdb: 4294 MB, 4294967296 bytes, 8388608 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
Disk label type: dos
Disk identifier: 0xc0ee42ab

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1            2048      206847      102400   83  Linux

Command (m for help):


# there is free space

Command (m for help): n
Partition type:
   p   primary (1 primary, 0 extended, 3 free)
   e   extended
Select (default p): p
Partition number (2-4, default 2): 3
First sector (206848-8388607, default 206848):
Using default value 206848
Last sector, +sectors or +size{K,M,G} (206848-8388607, default 8388607): +100M
Partition 3 of type Linux and of size 100 MiB is set

Command (m for help): p

Disk /dev/sdb: 4294 MB, 4294967296 bytes, 8388608 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
Disk label type: dos
Disk identifier: 0xc0ee42ab

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1            2048      206847      102400   83  Linux
/dev/sdb3          206848      411647      102400   83  Linux

Command (m for help): 
-------------
for LVM we need to change partition type

Command (m for help): l

 0  Empty           24  NEC DOS         81  Minix / old Lin bf  Solaris        
 1  FAT12           27  Hidden NTFS Win 82  Linux swap / So c1  DRDOS/sec (FAT-
 2  XENIX root      39  Plan 9          83  Linux           c4  DRDOS/sec (FAT-
 3  XENIX usr       3c  PartitionMagic  84  OS/2 hidden C:  c6  DRDOS/sec (FAT-
 4  FAT16 <32M      40  Venix 80286     85  Linux extended  c7  Syrinx         
 5  Extended        41  PPC PReP Boot   86  NTFS volume set da  Non-FS data    
 6  FAT16           42  SFS             87  NTFS volume set db  CP/M / CTOS / .
 7  HPFS/NTFS/exFAT 4d  QNX4.x          88  Linux plaintext de  Dell Utility   
 8  AIX             4e  QNX4.x 2nd part 8e  Linux LVM       df  BootIt         
 9  AIX bootable    4f  QNX4.x 3rd part 93  Amoeba          e1  DOS access     
 a  OS/2 Boot Manag 50  OnTrack DM      94  Amoeba BBT      e3  DOS R/O        
 b  W95 FAT32       51  OnTrack DM6 Aux 9f  BSD/OS          e4  SpeedStor      
 c  W95 FAT32 (LBA) 52  CP/M            a0  IBM Thinkpad hi eb  BeOS fs        
 e  W95 FAT16 (LBA) 53  OnTrack DM6 Aux a5  FreeBSD         ee  GPT            
 f  W95 Ext'd (LBA) 54  OnTrackDM6      a6  OpenBSD         ef  EFI (FAT-12/16/
10  OPUS            55  EZ-Drive        a7  NeXTSTEP        f0  Linux/PA-RISC b
11  Hidden FAT12    56  Golden Bow      a8  Darwin UFS      f1  SpeedStor      
12  Compaq diagnost 5c  Priam Edisk     a9  NetBSD          f4  SpeedStor      
14  Hidden FAT16 <3 61  SpeedStor       ab  Darwin boot     f2  DOS secondary  
16  Hidden FAT16    63  GNU HURD or Sys af  HFS / HFS+      fb  VMware VMFS    
17  Hidden HPFS/NTF 64  Novell Netware  b7  BSDI fs         fc  VMware VMKCORE 
18  AST SmartSleep  65  Novell Netware  b8  BSDI swap       fd  Linux raid auto
1b  Hidden W95 FAT3 70  DiskSecure Mult bb  Boot Wizard hid fe  LANstep        
1c  Hidden W95 FAT3 75  PC/IX           be  Solaris boot    ff  BBT            
1e  Hidden W95 FAT1 80  Old Minix      

Command (m for help): t
Partition number (1,3, default 3): 3
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'

Command (m for help): p

Disk /dev/sdb: 4294 MB, 4294967296 bytes, 8388608 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
Disk label type: dos
Disk identifier: 0xc0ee42ab

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1            2048      206847      102400   83  Linux
/dev/sdb3          206848      411647      102400   8e  Linux LVM
#writing changes
Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
#push changes to kernel
[root@localhost /]# partprobe
[root@localhost /]# 

at this time we are ready to start creating physical volume,volume group and logical volume.

[root@localhost /]# pvcreate /dev/sdb3
File descriptor 22 (socket:[27108]) leaked on pvcreate invocation. Parent PID 3225: -bash
  Physical volume "/dev/sdb3" successfully created.
[root@localhost /]# pvs
File descriptor 22 (socket:[27108]) leaked on pvs invocation. Parent PID 3225: -bash
  PV         VG Fmt  Attr PSize   PFree  
  /dev/sda2  cl lvm2 a--   19.00g      0 
  /dev/sdb3     lvm2 ---  100.00m 100.00m
[root@localhost /]# 


[root@localhost /]# vgcreate vgmyvg /dev/sdb3
File descriptor 22 (socket:[27108]) leaked on vgcreate invocation. Parent PID 3225: -bash
  Volume group "vgmyvg" successfully created
[root@localhost /]# 


[root@localhost /]# vgs
File descriptor 22 (socket:[27108]) leaked on vgs invocation. Parent PID 3225: -bash
  VG     #PV #LV #SN Attr   VSize  VFree 
  cl       1   2   0 wz--n- 19.00g     0 
  vgmyvg   1   0   0 wz--n- 96.00m 96.00m #4 Mb used for metadata
[root@localhost /]# 

[root@localhost /]# lvcreate -n lvmylv -L 96M vgmyvg
File descriptor 22 (socket:[27108]) leaked on lvcreate invocation. Parent PID 3225: -bash
  Logical volume "lvmylv" created.
[root@localhost /]# 

[root@localhost /]# lvs
File descriptor 22 (socket:[27108]) leaked on lvs invocation. Parent PID 3225: -bash
  LV     VG     Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root   cl     -wi-ao---- 17.00g                                                    
  swap   cl     -wi-ao----  2.00g                                                    
  lvmylv vgmyvg -wi-a----- 96.00m                                                    
[root@localhost /]# 


[root@localhost /]# mkfs.ext2 /dev/vgmyvg/lvmylv 
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
Stride=0 blocks, Stripe width=0 blocks
24576 inodes, 98304 blocks
4915 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=67371008
12 block groups
8192 blocks per group, 8192 fragments per group
2048 inodes per group
Superblock backups stored on blocks: 
        8193, 24577, 40961, 57345, 73729

Allocating group tables: done                            
Writing inode tables: done                            
Writing superblocks and filesystem accounting information: done 

[root@localhost /]# 

[root@localhost /]# mount | grep ^/dev
/dev/mapper/cl-root on / type xfs (rw,relatime,attr2,inode64,usrquota,grpquota)
/dev/sda1 on /boot type xfs (rw,relatime,attr2,inode64,noquota)
/dev/mapper/vgmyvg-lvmylv on /mnt type ext2 (rw,relatime)
[root@localhost /]#

[root@localhost /]# ls -l /dev/mapper/vgmyvg-lvmylv 
lrwxrwxrwx 1 root root 7 Aug  2 16:50 /dev/mapper/vgmyvg-lvmylv -> ../dm-2

[root@localhost /]# ls -l /dev/vgmyvg/lvmylv 
lrwxrwxrwx 1 root root 7 Aug  2 16:50 /dev/vgmyvg/lvmylv -> ../dm-2
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