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Esempio, creazione di un Logical Volume in Volume Group con tre partizioni ed Estensione del VG. 

 

Nuovo disco:

/dev/sdb

Creare 3 partizioni sul disco /dev/sdb da 100M
fdisk /dev/sdb
n

p

1

(primo settore default)

ultimo: +100M

 

fdisk /dev/sdb
n

p

2

(primo settore default)

ultimo: +100M

 

fdisk /dev/sdb
n

p

3

(primo settore default)

ultimo: +100M

 

Visualizzare le partizioni create:
p

Device Boot      Start         End      Blocks   Id  System
/dev/sdb1            2048      206847      102400   83  Linux
/dev/sdb2          206848      411647      102400   83  Linux
/dev/sdb3          411648      616447      102400   83  Linux

 

 

eventualmente t per cambiare tipo di partizione in LSV
8e = changes to LVM partition type

ma non sembra necessario

 

w per salvare

 

———————–

 

Update the kernel to save the changes without restarting the system.

partprobe

 

 

 

[root@localhost boot]# pvcreate /dev/sdb1 /dev/sdb2 /dev/sdb3
  Physical volume "/dev/sdb1" successfully created
  Physical volume "/dev/sdb2" successfully created
  Physical volume "/dev/sdb3" successfully created

 

 

[root@localhost boot]# pvdisplay 
  — Physical volume —
  PV Name               /dev/sda2
  VG Name               centos
  PV Size               19.51 GiB / not usable 3.00 MiB
  Allocatable           yes 
  PE Size               4.00 MiB
  Total PE              4994
  Free PE               10
  Allocated PE          4984
  PV UUID               5YZUsZ-zVgG-xW7k-rIsC-EAJa-UmhV-emiLFk
   
  "/dev/sdb3" is a new physical volume of "100.00 MiB"
  — NEW Physical volume —
  PV Name               /dev/sdb3
  VG Name               
  PV Size               100.00 MiB
  Allocatable           NO
  PE Size               0   
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               kCpgqS-Q4mx-AaiR-kydR-7ltE-SepA-xGL7zM
   
  "/dev/sdb1" is a new physical volume of "100.00 MiB"
  — NEW Physical volume —
  PV Name               /dev/sdb1
  VG Name               
  PV Size               100.00 MiB
  Allocatable           NO
  PE Size               0   
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               sy34gi-QIt4-vT7F-xH25-4bE9-luEc-qBThrs
   
  "/dev/sdb2" is a new physical volume of "100.00 MiB"
  — NEW Physical volume —
  PV Name               /dev/sdb2
  VG Name               
  PV Size               100.00 MiB
  Allocatable           NO
  PE Size               0   
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               AQm0MW-yRIU-12LM-dRip-7IIA-bkAe-ncdwvI
   

 

[root@localhost boot]# lvmdiskscan 
  /dev/centos/root [      17.47 GiB] 
  /dev/sda1        [     500.00 MiB] 
  /dev/centos/swap [       2.00 GiB] 
  /dev/sda2        [      19.51 GiB] LVM physical volume
  /dev/sdb1        [     100.00 MiB] LVM physical volume
  /dev/sdb2        [     100.00 MiB] LVM physical volume
  /dev/sdb3        [     100.00 MiB] LVM physical volume

 

 

[root@localhost boot]# vgcreate vg1 /dev/sdb1 /dev/sdb2
  Volume group "vg1" successfully created

 

 

 

 — Volume group —
  VG Name               vg1
  System ID             
  Format                lvm2
  Metadata Areas        2
  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                2
  Act PV                2
  VG Size               192.00 MiB
  PE Size               4.00 MiB
  Total PE              48
  Alloc PE / Size       0 / 0   
  Free  PE / Size       48 / 192.00 MiB
  VG UUID               gjGT2M-e1u7-51OB-zER1-2Vtg-A0KW-eRv6OI

 

 

  — Logical volume —
  LV Path                /dev/vg1/lv1
  LV Name                lv1
  VG Name                vg1
  LV UUID                yDJY0o-b56e-OAbq-uoJW-c57K-HDpI-I6tXns
  LV Write Access        read/write
  LV Creation host, time localhost.localdomain, 2015-08-04 12:52:51 +0200
  LV Status              available
  # open                 0
  LV Size                180.00 MiB
  Current LE             45
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  – currently set to     8192
  Block device           253:2

 

 

[root@localhost boot]# mkfs.ext4 /dev/vg1/lv1
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
46184 inodes, 184320 blocks
9216 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=33816576
23 block groups
8192 blocks per group, 8192 fragments per group
2008 inodes per group
Superblock backups stored on blocks: 
     8193, 24577, 40961, 57345, 73729

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done 

 

 

 

[root@localhost boot]# vgextend vg1 /dev/sdb3 
  Volume group "vg1" successfully extended

 

 

oppure

[root@localhost /]# cd ..
[root@localhost /]# umount /mnt/
[root@localhost /]# lvremove /dev/vg1/lv1 
Do you really want to remove active logical volume lv1? [y/n]: y
  Logical volume "lv1" successfully removed

 

 

[root@localhost /]# vgremove /dev/vg1
  Volume group "vg1" successfully removed

[root@localhost /]# pvremove /dev/sdb1 /dev/sdb2 /dev/sdb3
  Labels on physical volume "/dev/sdb1" successfully wiped
  Labels on physical volume "/dev/sdb2" successfully wiped
  Labels on physical volume "/dev/sdb3" successfully wiped

 

 

 

INFO

 

I Volume group e i Logical Volume si trovano sotto: