Linux 建立LVM(Logical Volume)

近期和其它同事參與了儲存的劃分，由於工作性質，這方面的命令已經特別陌生，重新梳理了LVM建立過程，以便不時之需；

---1 作業系統版本
[root@chen ~]# cat /etc/issue
Red Hat Enterprise Linux Server release 6.4 (Santiago)
Kernel \r on an \m

---2 需要建立LVM的磁碟
[root@chen ~]# fdisk -l

Disk /dev/sdb: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/sdc: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/sdd: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

---3 建立PV(Physical Volume)
[root@chen ~]# pvcreate /dev/sdb
  Physical volume "/dev/sdb" successfully created
[root@chen ~]# pvcreate /dev/sdc
  Physical volume "/dev/sdc" successfully created
[root@chen ~]# pvcreate /dev/sdd
  Physical volume "/dev/sdd" successfully created

---4 檢視PV 
[root@chen ~]# pvdisplay 
  "/dev/sdb" is a new physical volume of "1.00 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/sdb
  VG Name               
  PV Size               1.00 GiB
  Allocatable           NO
  PE Size               0   
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               JA8nPJ-LP8N-cw1U-qCY3-0yiD-yYJd-XiiHBq
   
  "/dev/sdc" is a new physical volume of "1.00 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/sdc
  VG Name               
  PV Size               1.00 GiB
  Allocatable           NO
  PE Size               0   
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               CRoe30-68V7-vVgt-QKss-kS3H-pufb-znImot
   
  "/dev/sdd" is a new physical volume of "1.00 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/sdd
  VG Name               
  PV Size               1.00 GiB
  Allocatable           NO
  PE Size               0   
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               sb7VKF-JY1B-vACE-hUZI-e2KQ-PfXe-CMCBVF
  
[root@chen ~]# pvscan 
  PV /dev/sdb                      lvm2 [1.00 GiB]
  PV /dev/sdc                      lvm2 [1.00 GiB]
  PV /dev/sdd                      lvm2 [1.00 GiB]
  Total: 3 [3.00 GiB] / in use: 0 [0   ] / in no VG: 3 [3.00 GiB]
 
---5 建立VG(Volumne Group)
[root@chen ~]# vgcreate VolGroup001 /dev/sdb /dev/sdc /dev/sdd
  Volume group "VolGroup001" successfully created

---6 檢視VG
[root@chen ~]# vgdisplay 
  --- Volume group ---
  VG Name               VolGroup001
  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               2.99 GiB
  PE Size               4.00 MiB
  Total PE              765
  Alloc PE / Size       0 / 0   
  Free  PE / Size       765 / 2.99 GiB
  VG UUID               DwFmKs-LONs-aF91-vrHt-9C9S-YoyQ-CLGwRn

[root@chen ~]# vgscan 
  Reading all physical volumes.  This may take a while...
  Found volume group "VolGroup001" using metadata type lvm2

---7 建立LV(Logical Volume) 
[root@chen ~]# lvcreate -L 2G -n lvData01 VolGroup001
  Logical volume "lvData01" created

---8 檢視LV
[root@chen ~]# lvdisplay 
  --- Logical volume ---
  LV Path                /dev/VolGroup001/lvData01
  LV Name                lvData01
  VG Name                VolGroup001
  LV UUID                5V8LUf-I835-isBg-l0zN-tfhI-XmkS-sibQ7s
  LV Write Access        read/write
  LV Creation host, time chen, 2018-04-19 23:43:42 +0800
  LV Status              available
  # open                 0
  LV Size                2.00 GiB
  Current LE             512
  Segments               3
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

[root@chen ~]# lvscan 
  ACTIVE            '/dev/VolGroup001/lvData01' [2.00 GiB] inherit

[root@chen ~]# fdisk -l
......
Disk /dev/mapper/VolGroup001-lvData01: 2147 MB, 2147483648 bytes
255 heads, 63 sectors/track, 261 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

---9 格式化
[root@chen ~]# mkfs -t ext4 /dev/mapper/VolGroup001-lvData01 

---10 掛載
[root@chen ~]# mkdir /data
[root@chen ~]# mount /dev/VolGroup001/lvData01 /data
[root@chen ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda3              48G   29G   16G  65% /
tmpfs                 932M   76K  932M   1% /dev/shm
/dev/sda1             194M   33M  152M  18% /boot
/dev/sr0              3.5G  3.5G     0 100% /media/RHEL_6.4 x86_64 Disc 1
/dev/mapper/VolGroup001-lvData01
                      2.0G   67M  1.9G   4% /data

[root@chen ~]# vi /etc/fstab
/dev/mapper/VolGroup001-lvData01 /data          ext4    defaults        0 0  

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