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學(xué)習(xí)啦 > 學(xué)習(xí)電腦 > 操作系統(tǒng) > Linux教程 > 怎么刪除LVM中PV物理卷

怎么刪除LVM中PV物理卷

時(shí)間: 春健736 分享

怎么刪除LVM中PV物理卷

  LVM通常用于裝備大量磁盤的系統(tǒng),今天學(xué)習(xí)啦小編要給大家介紹的是Linux如何刪除LVM中的硬盤或分區(qū),一起來學(xué)習(xí)下吧。

  怎么刪除LVM中PV物理卷

  一、由于硬盤或者分區(qū)的操作方式其實(shí)都一樣,所以我這里就以分區(qū)為例。

  二、/home分區(qū)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?yàn)闇y試。

  三、隨機(jī)寫了一堆文件進(jìn)去,用量達(dá)到了2G,空閑500M

  四、準(zhǔn)備將sda6這個200M的PV卸掉(卸掉的容量必須小于空閑容量)

  好了開始具體操作了。

  卸載分區(qū)(縮小操作必須卸載才能進(jìn)行):

  umount /home

  縮小分區(qū):

  e2fsck -f /dev/liuhg_disk/home

  resize2fs /dev/liuhg_disk/home 2200M

  首先將分區(qū)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(yīng)該是足夠的。

  縮小邏輯卷:

  lvreduce -L 2200M /dev/liuhg_disk/home

  分區(qū)縮小了用到的邏輯卷也要隨著縮小,并查看PV使用的狀態(tài):

  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里寫滿了數(shù)據(jù)一點(diǎn)不剩

  Allocated PE 50 <-----這50PE的數(shù)據(jù)要挪走才行,否則數(shù)據(jù)就丟了,并且存放的地方也必須是連續(xù)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(qū)有76個空余,因此預(yù)計(jì)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

  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(shè)置為離線狀態(tài):

  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(jīng)關(guān)閉了該P(yáng)V

  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(shù)據(jù)移走:

  pvmove -i 1 /dev/sda6

  -i 1是每1秒鐘報(bào)告一次數(shù)據(jù)遷移的進(jìn)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 <----顯示完全空閑和Total PE數(shù)一致

  Allocated PE 0

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

  ……

  從卷組里把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(jīng)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

  /dev/sda1 2.0G 546M 1.3G 30% /

  tmpfs 504M 0 504M 0% /dev/shm

  /dev/mapper/liuhg_disk-home

  2.2G 1.8G 42M 98% /home

  進(jìn)去看看數(shù)據(jù),一個都沒丟。

  上面就是Linux刪除LVM中的PV物理卷(硬盤或分區(qū))的介紹了,如果你在系統(tǒng)中安裝了LCM,而又不知道如何刪除其中的PV物理卷的話,可以試試文中介紹的方法。

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