LVM通常用於裝備大量磁盤的系統,具有良好的可伸縮性,可對卷組、邏輯卷的大小進行調整,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),一起來學習下吧。
一、由於硬盤或者分區的操作方式其實都一樣,所以我這裡就以分區為例。
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,空閒500M
四、准備將sda6這個200M的PV卸掉(卸掉的容量必須小於空閒容量)
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,並查看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裡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,並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
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