如何安全的删除Linux LVM中的PV物理卷(硬盘或分区)-系统配置-梦飞云服务器租用

大大都文章先容的都仅仅是添加硬盘以及调解分区巨细，但很少有安详的彻底卸掉个中一个分区或硬盘的，这里重点先容一下这个。

环境先容：

一、由于硬盘可能分区的操纵方法其实都一样，所以我这里就以分区为例。

二、/home分区2.6G，新加坡电信服务器马来西亚服务器，由如下pv构成：

/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，用量到达了2G，空闲500M

四、筹备将sda6这个200M的PV卸掉（卸掉的容量必需小于空闲容量）

好了开始详细操纵了。

卸载分区（缩小操纵必需卸载才气举办）：

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跟着缩小，并查察PV利用的状态：

pvdisplay -m

显示如下：

--- 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，不然数据就丢了，而且存放的处所也必需是持续的至少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，因此估量装那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
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