萬盛學電腦網

 萬盛學電腦網 >> Linux教程 >> Linux刪除LVM中PV物理卷的技巧

Linux刪除LVM中PV物理卷的技巧

  LVM通常用於裝備大量磁盤的系統,具有良好的可伸縮性,可對卷組、邏輯卷的大小進行調整,今天小編要給大家介紹的是Linux如何刪除LVM中的PV物理卷(硬盤或分區),一起來學習下吧。

 Linux刪除LVM中PV物理卷的技巧

  一、由於硬盤或者分區的操作方式其實都一樣,所以我這裡就以分區為例。

  二、/home分區2.6G,由如下pv組成:

  /dev/sda5 100M

  /dev/sda6 200M

  /dev/sda7 300M

  /dev/sda8 400M

  /dev/sda9 500M

  /dev/sda10 600M

  /dev/sda11 500M

  很碎對吧?^_^因為測試。

  三、隨機寫了一堆文件進去,用量達到了2G,空閒500M

  四、准備將sda6這個200M的PV卸掉(卸掉的容量必須小於空閒容量)

  好了開始具體操作了。

  卸載分區(縮小操作必須卸載才能進行):

  umount /home

  縮小分區:

  e2fsck -f /dev/liuhg_disk/home

  resize2fs /dev/liuhg_disk/home 2200M

  首先將分區縮小到2200M這是為了給sda6騰出空間,sda6為200M,而我騰出了400M,因此應該是足夠的。

  縮小邏輯卷:

  lvreduce -L 2200M /dev/liuhg_disk/home

  分區縮小了用到的邏輯卷也要隨著縮小,並查看PV使用的狀態:

  pvdisplay -m

  顯示如下:

  --- Physical volume ---

  PV Name /dev/sda5

  VG Name liuhg_disk

  PV Size 103.26 MiB / not usable 3.26 MiB

  Allocatable yes (but full)

  PE Size 4.00 MiB

  Total PE 25

  Free PE 0

  Allocated PE 25

  PV UUID 5lnx52-b4jc-OOfZ-f2QA-ttdQ-DZeD-Ce3rb3

  --- Physical Segments ---

  Physical extent 0 to 24:

  Logical volume /dev/liuhg_disk/home

  Logical extents 0 to 24

  --- Physical volume ---

  PV Name /dev/sda6

  VG Name liuhg_disk

  PV Size 203.92 MiB / not usable 3.92 MiB

  Allocatable yes (but full)

  PE Size 4.00 MiB

  Total PE 50

  Free PE 0 《-----太悲劇了,sda6裡寫滿了數據一點不剩

  Allocated PE 50 《-----這50PE的數據要挪走才行,否則數據就丟了,並且存放的地方也必須是連續的至少50PE

  PV UUID S2ane6-nlFG-uSNR-35NP-Yxa6-cXRb-r8E8mK

  --- Physical Segments ---

  Physical extent 0 to 49:

  Logical volume /dev/liuhg_disk/home

  Logical extents 25 to 74

  --- Physical volume ---

  PV Name /dev/sda7

  VG Name liuhg_disk

  PV Size 305.89 MiB / not usable 1.89 MiB

  Allocatable yes

  PE Size 4.00 MiB

  Total PE 76

  Free PE 76 《---這個分區有76個空余,因此預計裝那50個是不會有問題的

  Allocated PE 0

  PV UUID 9CFnlx-CAEw-CSul-Rig9-FiCN-zK0a-oGmTEP

  --- Physical Segments ---

  Physical extent 0 to 75:

  FREE

  --- Physical volume ---

  PV Name /dev/sda8

  VG Name liuhg_disk

  PV Size 407.87 MiB / not usable 3.87 MiB

  Allocatable yes

  PE Size 4.00 MiB

  Total PE 101

  Free PE 60

  Allocated PE 41

  PV UUID X0I8p0-x2xr-2xLG-QQD4-jbtS-3C4i-xPn4Bl

  --- Physical Segments ---

  Physical extent 0 to 40:

  Logical volume /dev/liuhg_disk/home

  Logical extents 471 to 511

上一頁12下一頁共2頁

  Physical extent 41 to 100:

  FREE

  --- Physical volume ---

  PV Name /dev/sda9

  VG Name liuhg_disk

  PV Size 509.84 MiB / not usable 1.84 MiB

  Allocatable yes (but full)

  PE Size 4.00 MiB

  Total PE 127

  Free PE 0

  Allocated PE 127

  PV UUID avJQaA-oMKt-NEoJ-ojBK-2Csc-1dca-1mh6Ue

  --- Physical Segments ---

  Physical extent 0 to 126:

  Logical volume /dev/liuhg_disk/home

  Logical extents 225 to 351

  --- Physical volume ---

  PV Name /dev/sda10

  VG Name liuhg_disk

  PV Size 603.98 MiB / not usable 3.98 MiB

  Allocatable yes (but full)

  PE Size 4.00 MiB

  Total PE 150

  Free PE 0

  Allocated PE 150

  PV UUID JlMIAF-A49n-M6HA-ZLXf-d8nS-pfZr-YeQsKT

  --- Physical Segments ---

  Physical extent 0 to 149:

  Logical volume /dev/liuhg_disk/home

  Logical extents 75 to 224

  --- Physical volume ---

  PV Name /dev/sda11

  VG Name liuhg_disk

  PV Size 478.47 MiB / not usable 2.47 MiB

  Allocatable yes (but full)

  PE Size 4.00 MiB

  Total PE 119

  Free PE 0

  Allocated PE 119

  PV UUID xnHJNA-tDVx-dryX-KM1x-g96Y-sptI-9iUOcU

  --- Physical Segments ---

  Physical extent 0 to 118:

  Logical volume /dev/liuhg_disk/home

  Logical extents 352 to 470

  將sda6設置為離線狀態:

  pvchange -xn /dev/sda6

  使用pvdisplay -m

  顯示如下:

  ……

  --- Physical volume ---

  PV Name /dev/sda6

  VG Name liuhg_disk

  PV Size 203.92 MiB / not usable 3.92 MiB

  Allocatable NO 《-----表示已經關閉了該PV

  PE Size 4.00 MiB

  Total PE 50

  Free PE 0

  Allocated PE 50

  PV UUID S2ane6-nlFG-uSNR-35NP-Yxa6-cXRb-r8E8mK

  ……

  將sda6的數據移走:

  pvmove -i 1 /dev/sda6

  -i 1是每1秒鐘報告一次數據遷移的進度。

  [root@liuhg /]# pvmove -i 1 /dev/sda6

  /dev/sda6: Moved: 38.0%

  /dev/sda6: Moved: 84.0%

  /dev/sda6: Moved: 100.0%

  重新用pvdisplay -m

  顯示如下:

  ……

  --- Physical volume ---

  PV Name /dev/sda6

  VG Name liuhg_disk

  PV Size 203.92 MiB / not usable 3.92 MiB

  Allocatable NO

  PE Size 4.00 MiB

  Total PE 50

  Free PE 50 《----顯示完全空閒和Total PE數一致

  Allocated PE 0

  PV UUID S2ane6-nlFG-uSNR-35NP-Yxa6-cXRb-r8E8mK

  ……

  從卷組裡把sda6刪除:

  [root@liuhg /]# vgreduce liuhg_disk /dev/sda6

  Removed “/dev/sda6” from volume group “liuhg_disk”

  pvdisplay -m再看看吧:

  --- NEW Physical volume --- 《-----還告訴你這是一個新的PV ^_^

  PV Name /dev/sda6

  VG Name 《-----空了

  PV Size 203.92 MiB

  Allocatable NO

  PE Size 0

  Total PE 0

  Free PE 0

  Allocated PE 0

  PV UUID S2ane6-nlFG-uSNR-35NP-Yxa6-cXRb-r8E8mK

  到此vgdisplay -v能看到已經沒有了/dev/sda6了。重新掛載/home

  [root@liuhg /]# mount /dev/liuhg_disk/home /home

  [root@liuhg /]# df -h

  Filesystem Size Used Avail Use% Mounted on

copyright © 萬盛學電腦網 all rights reserved