Linux怎么刪除LVM中PV物理卷
Linux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)，具有良好的可伸縮性，可對卷組、邏輯卷的大小進行調(diào)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(qū))，一起來學習下吧。
一、由于硬盤或者分區(qū)的操作方式其實都一樣，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(qū)(縮小操作必須卸載才能進行)：
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