如何創(chuàng)建并使用LVM邏輯卷

[root@xuegod63 ~]# fdisk /dev/sdb #創(chuàng)建4個(gè)主分區(qū)，每個(gè)分區(qū)1G

[root@xuegod63 ~]# ls /dev/sdb*

/dev/sdb  /dev/sdb1  /dev/sdb2  /dev/sdb3  /dev/sdb4

設(shè)定分區(qū)類型代碼：fdisk /dev/sdb ===> t ===> 選擇分區(qū)號(hào) ====> 8e ====> w

注：現(xiàn)在系統(tǒng)已經(jīng)很智能了， 直接使用默認(rèn)的 83  Linux分區(qū)，也可以創(chuàng)建pv的。

[root@xuegod63 ~]# pvcreate /dev/sdb{1,2,3,4}   #創(chuàng)建pv

Physical volume "/dev/sdb1" successfully created.

Physical volume "/dev/sdb2" successfully created.

Physical volume "/dev/sdb3" successfully created.

Physical volume "/dev/sdb4" successfully created.

[root@xuegod63 ~]# pvdisplay /dev/sdb1 #查看物理卷信息

"/dev/sdb1" is a new physical volume of "1.00 GiB"

--- NEW Physical volume ---

PV Name               /dev/sdb1

VG Name

PV Size               1.00 GiB

Allocatable           NO

PE Size               0

Total PE              0

Free PE               0

Allocated PE          0

PV UUID               SHKFwf-WsLr-kkox-wlee-dAXc-5eL0-hyhaTV

[root@xuegod63 ~]#  vgcreate vg01 /dev/sdb1

Volume group "vg01" successfully created

[root@xuegod63 ~]#  vgs

VG   #PV #LV #SN Attr   VSize    VFree

vg01   1   0   0 wz--n- 1020.00m 1020.00m

[root@xuegod63 ~]#  vgdisplay vg01

--- Volume group ---

VG Name               vg01

System ID

Format                lvm2

Metadata Areas        1

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                1

Act PV                1

VG Size               1020.00 MiB

PE Size  4.00 MiB

Total PE              255

Alloc PE / Size       0 / 0

[root@xuegod63 ~]#  lvcreate -n lv01 -L 16M vg01

Logical volume "lv01" created.

[root@xuegod63 ~]#  lvcreate -n lv02 -l 4 vg01

Logical volume "lv02" created.

[root@xuegod63 ~]# lvs

LV   VG   Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert

lv01 vg01 -wi-a----- 16.00m

lv02 vg01 -wi-a----- 16.00m

[root@xuegod63 ~]# pvdisplay /dev/sdb1

--- Physical volume ---

PV Name               /dev/sdb1

VG Name               vg01

PV Size               1.00 GiB / not usable 4.00 MiB

Allocatable           yes

PE Size               4.00 MiB

Total PE              255

Free PE               247

Allocated PE          8   # Allocated    ['?l?ke?t?d]  分配  ，已經(jīng)使用了8個(gè)PE

[root@xuegod63 ~]# vgdisplay vg01

。。。

Alloc PE / Size       8 / 32.00 MiB   #已經(jīng)使用8M

Free  PE / Size       247 / 988.00 MiB

[root@xuegod65 ~]# lvdisplay /dev/vg01/lv01 #注意這里要跟絕對(duì)路徑

--- Logical volume ---

LV Path                /dev/vg01/lv01

LV Name                lv01

VG Name                vg01

LV UUID                vx7Ib4-vkT8-MP6P-DubV-Vmhx-3Oau-LZcODv

LV Write Access        read/write

LV Creation host, time xuegod65, 2018-05-19 12:32:50 +0800

LV Status              available

# open                 0

LV Size                16.00 MiB

Current LE             4

Segments               1

Allocation             inherit

Read ahead sectors     auto

- currently set to     8192

Block device           253:2

創(chuàng)建掛載點(diǎn)

[root@xuegod63 ~]# mkdir /lv01

互動(dòng)： lv01 邏輯卷的路徑在哪？

#查看邏輯卷

[root@xuegod63 ~]# ls  /dev/vg01/  

lv01  lv02

#其實(shí)lv01是dm-0的軟鏈接

[root@xuegod63 ~]# ll  /dev/vg01/lv01

lrwxrwxrwx 1 root root 7 5月  19 12:32 /dev/vg01/lv01 -> ../dm-2

將lv01格式化ext4格式

[root@xuegod63 ~]# mkfs.ext4 /dev/vg01/lv01

掛載到lv01這個(gè)掛載點(diǎn)

[root@xuegod63 ~]# mount /dev/vg01/lv01  /lv01

查看掛在情況

[root@xuegod63 ~]# df -Th /lv01

文件系統(tǒng)              類型  容量  已用  可用 已用% 掛載點(diǎn)

/dev/mapper/vg01-lv01 ext4   15M  268K   14M    2% /lv01

設(shè)置開機(jī)自動(dòng)掛載

[root@xuegod63 ~]#echo  "/dev/vg01/lv01 /lv01 ext4 defaults 0 0"  >> /etc/fstab