062-LVM命令小結（回收，擴盤，建立）

時間 2019-12-22

標籤 lvm 命令小結回收建立欄目 Linux 简体版

原文原文鏈接

回收步驟html

一、先經過umount命令卸載掉邏輯卷/bakapp

二、經過lvremove 刪除邏輯卷bakvide

三、經過vgremove 刪除卷組bakvgui

四、經過pvremove 將物理卷轉化成普通分區。3d

五、刪除分區code

fdisk /dev/sdcorm

mserver

dhtm

d rem

分區步驟

一、劃分區

(1) 查看有沒有可用盤

fdisk -l

echo "- - -" > /sys/class/scsi_host/host0/scan

echo "- - -" > /sys/class/scsi_host/host1/scan

echo "- - -" > /sys/class/scsi_host/host2/scan

(2) 創建分區

fdisk /dev/sdb <<EOF

EOF

二、建立物理卷

pvcreate /dev/sdb1

三、建立卷組

vgcreate appvg /dev/sdb1

四、建立及擴展邏輯卷

lvcreate -L 2g -n applv appvg

lvextend /dev/mapper/appvg-applv /dev/sdb1

五、格式化邏輯卷

mkfs.ext4 /dev/mapper/appvg-applv

六、邏輯卷及掛載點加入開機自啓動

echo '/dev/mapper/appvg-applv /app ext4 defaults 0 0' >>/etc/fstab

七、建立掛載點及掛載

mkdir /app

mount -a

八、查看掛載信息

df –h

在線擴容步驟：

fdisk /dev/sdc<<EOF

EOF

pvcreate /dev/sdc1

vgextend appvg /dev/sdc

lvextend -l 524824 /dev/mapper/appvg-applv /dev/sdc1

resize2fs /dev/mapper/appvg-applv

df -h

[root@Idmsim04-v-szzb ~]# fdisk -l

Disk /dev/sda: 53.7 GB, 53687091200 bytes
64 heads, 32 sectors/track, 51200 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0006faf1

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           2         401      409600   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2             402       51200    52018176   8e  Linux LVM
Partition 2 does not end on cylinder boundary.

Disk /dev/sdb: 53.7 GB, 53687091200 bytes
64 heads, 32 sectors/track, 51200 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xab80f46e

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1       51200    52428784   8e  Linux LVM

Disk /dev/mapper/vg01-lv_root: 36.1 GB, 36083597312 bytes
255 heads, 63 sectors/track, 4386 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/mapper/vg01-lv_swap: 17.2 GB, 17179869184 bytes
255 heads, 63 sectors/track, 2088 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/mapper/appvg-applv: 53.7 GB, 53682896896 bytes
255 heads, 63 sectors/track, 6526 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: 107.4 GB, 107374182400 bytes
255 heads, 63 sectors/track, 13054 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

[root@Idmsim04-v-szzb ~]# lvs
  LV      VG    Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  applv   appvg -wi-ao---- 50.00g                                                    
  lv_root vg01  -wi-ao---- 33.61g                                                    
  lv_swap vg01  -wi-ao---- 16.00g                                                    
[root@Idmsim04-v-szzb ~]# pvs
  PV         VG    Fmt  Attr PSize  PFree
  /dev/sda2  vg01  lvm2 a--  49.61g    0 
  /dev/sdb1  appvg lvm2 a--  50.00g    0 
[root@Idmsim04-v-szzb ~]# vgs
  VG    #PV #LV #SN Attr   VSize  VFree
  appvg   1   1   0 wz--n- 50.00g    0 
  vg01    1   2   0 wz--n- 49.61g    0 
[root@Idmsim04-v-szzb ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg01-lv_root
                       33G  4.0G   28G  13% /
tmpfs                 7.8G     0  7.8G   0% /dev/shm
/dev/sda1             380M  108M  252M  31% /boot
/dev/mapper/appvg-applv
                       50G   34G   14G  72% /app
[root@Idmsim04-v-szzb ~]# pvcreate /dev/sdc 
  Physical volume "/dev/sdc" successfully created
[root@Idmsim04-v-szzb ~]# vgextend appvg /dev/sdc
  Volume group "appvg" successfully extended
[root@Idmsim04-v-szzb ~]# vgs
  VG    #PV #LV #SN Attr   VSize   VFree  
  appvg   2   1   0 wz--n- 149.99g 100.00g
  vg01    1   2   0 wz--n-  49.61g      0 
[root@Idmsim04-v-szzb ~]# vgdisplay
  --- Volume group ---
  VG Name               appvg
  System ID             
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               149.99 GiB
  PE Size               4.00 MiB
  Total PE              38398
  Alloc PE / Size       12799 / 50.00 GiB
  Free  PE / Size       25599 / 100.00 GiB
  VG UUID               dswZw4-gZCG-z4BX-b5q5-fPTd-ET5p-8A5Q7i
   
  --- Volume group ---
  VG Name               vg01
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  3
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               49.61 GiB
  PE Size               4.00 MiB
  Total PE              12699
  Alloc PE / Size       12699 / 49.61 GiB
  Free  PE / Size       0 / 0   
  VG UUID               nqpzwm-eUVo-HNHM-V3V8-m3dp-ZsnV-8f7WEm
   
[root@Idmsim04-v-szzb ~]# lvextend -l  38398 /dev/mapper/appvg-applv  /dev/sdc
  Size of logical volume appvg/applv changed from 50.00 GiB (12799 extents) to 149.99 GiB (38398 extents).
  Logical volume applv successfully resized
[root@Idmsim04-v-szzb ~]# resize2fs  /dev/mapper/appvg-applv 
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/mapper/appvg-applv is mounted on /app; on-line resizing required
old desc_blocks = 4, new_desc_blocks = 10
Performing an on-line resize of /dev/mapper/appvg-applv to 39319552 (4k) blocks.
The filesystem on /dev/mapper/appvg-applv is now 39319552 blocks long.

[root@Idmsim04-v-szzb ~]#  df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg01-lv_root
                       33G  4.0G   28G  13% /
tmpfs                 7.8G     0  7.8G   0% /dev/shm
/dev/sda1             380M  108M  252M  31% /boot
/dev/mapper/appvg-applv
                      148G   34G  107G  24% /app

附上一條parted擴盤的博客分析：

https://www.niaoyun.com/help/server/380.html