Linux删除LVM中PV物理卷的技巧

LVM通常用于装备大量磁盘的系统,具有良好的可伸缩性,可对卷组、逻辑卷的大小进行调整,今天小编要给大家介绍的是Linux如何删除LVM中的PV物理卷(硬盘或分区),一起来学习下吧 。

Linux删除LVM中PV物理卷的技巧


一、由于硬盘或者分区的操作方式其实都一样,所以我这里就以分区为例 。
二、/home分区2.6G,由如下pv组成:
/dev/sda5 100M
/dev/sda6 200M
/dev/sda7 300M
/dev/sda8 400M
/dev/sda9 500M
/dev/sda10 600M
/dev/sda11 500M
很碎对吧?^_^因为测试 。
三、随机写了一堆文件进去,用量达到了2G,空闲500M
四、准备将sda6这个200M的PV卸掉(卸掉的容量必须小于空闲容量)
好了开始具体操作了 。
卸载分区(缩小操作必须卸载才能进行):
umount /home
缩小分区:
e2fsck -f /dev/liuhg_disk/home
resize2fs /dev/liuhg_disk/home 2200M
首先将分区缩小到2200M这是为了给sda6腾出空间,sda6为200M,而我腾出了400M,因此应该是足够的 。
缩小逻辑卷:
lvreduce -L 2200M /dev/liuhg_disk/home
分区缩小了用到的逻辑卷也要随着缩小,并查看PV使用的状态:
pvdisplay -m
显示如下:
--- Physical volume ---
PV Name /dev/sda5
VG Name liuhg_disk
【Linux删除LVM中PV物理卷的技巧】 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 《-----太悲剧了,sda6里写满了数据一点不剩
Allocated PE 50 《-----这50PE的数据要挪走才行,否则数据就丢了,并且存放的地方也必须是连续的至少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 《---这个分区有76个空余,因此预计装那50个是不会有问题的
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
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