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使用Linux的LVM在不丟失數據的情況下刪除正在使用的硬盤或分區

 大多數文章介紹的都僅僅是添加硬盤以及調整分區大小,但很少有安全的徹底卸掉其中一個分區或硬盤的,這里重點介紹一下這個。

情況介紹:

一、由于硬盤或者分區的操作方式其實都一樣,所以我這里就以分區為例。

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,空閑500M

四、準備將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(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,并查看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里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,并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
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 <----顯示完全空閑和Total PE數一致
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

進去看看數據,一個都沒丟。

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