![LVM:通过从已删除的逻辑卷中释放可用空间来减少/缩小物理卷的大小](https://linux22.com/image/12012/LVM%EF%BC%9A%E9%80%9A%E8%BF%87%E4%BB%8E%E5%B7%B2%E5%88%A0%E9%99%A4%E7%9A%84%E9%80%BB%E8%BE%91%E5%8D%B7%E4%B8%AD%E9%87%8A%E6%94%BE%E5%8F%AF%E7%94%A8%E7%A9%BA%E9%97%B4%E6%9D%A5%E5%87%8F%E5%B0%91%2F%E7%BC%A9%E5%B0%8F%E7%89%A9%E7%90%86%E5%8D%B7%E7%9A%84%E5%A4%A7%E5%B0%8F.png)
我有以下 LVM 分区:
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/data-root 5.3G 4.2G 864M 84% /
...
/dev/mapper/data-install 6.8G 5.7G 783M 89% /install
# vgs
VG #PV #LV #SN Attr VSize VFree
data 1 2 0 wz--n- <12.50g 0
# vgdisplay
--- Volume group ---
VG Name data
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size <12.50 GiB
PE Size 4.00 MiB
Total PE 3199
Alloc PE / Size 3199 / <12.50 GiB
Free PE / Size 0 / 0
VG UUID jSACsC-wGwy-ki0w-nSCn-kxMy-bLOV-dVN68E
# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 data lvm2 a-- <12.50g 0
# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name data
PV Size <12.50 GiB / not usable 3.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 3199
Free PE 0
Allocated PE 3199
PV UUID CPggVR-sUXw-4gfw-lb2v-cq0j-M5ey-Ct7td3
# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
install data -wi-ao---- 7.00g
root data -wi-ao---- <5.50g
# lvdisplay
--- Logical volume ---
LV Path /dev/data/install
LV Name install
VG Name data
LV UUID ZXQmp5-L17b-eQyS-g3An-msk7-Jqso-MTaTIw
LV Write Access read/write
LV Creation host, time localhost, 2018-09-28 14:42:43 +0000
LV Status available
open 1
LV Size 7.00 GiB
Current LE 1792
Segments 1
Allocation inherit
Read ahead sectors aut
- currently set to 8192
Block device 253:1
--- Logical volume ---
LV Path /dev/data/root
LV Name root
VG Name data
LV UUID i3eMbC-rcm1-H2Gm-JJeF-jRxO-nL9h-toHSHQ
LV Write Access read/write
LV Creation host, time localhost, 2018-09-28 14:42:55 +0000
LV Status available
# open 1
LV Size <5.50 GiB
Current LE 1407
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
我正在删除逻辑卷之一:
# umount /install
# lvremove /dev/data/install
# sed -i 'N;/\/dev\/mapper\/data-install/{s#/dev/mapper/data-install.*\n##}' /etc/fstab
移除后:
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/data-root 5.3G 4.2G 867M 84% /
...
# vgs
VG #PV #LV #SN Attr VSize VFre
data 1 1 0 wz--n- <12.50g 7.00g
# vgdisplay
--- Volume group ---
VG Name data
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 1
Act PV 1
VG Size <12.50 GiB
PE Size 4.00 MiB
Total PE 3199
Alloc PE / Size 1407 / <5.50 GiB
Free PE / Size 1792 / 7.00 GiB
VG UUID jSACsC-wGwy-ki0w-nSCn-kxMy-bLOV-dVN68E
# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 data lvm2 a-- <12.50g 7.00g
# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name data
PV Size <12.50 GiB / not usable 3.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 3199
Free PE 1792
Allocated PE 1407
PV UUID CPggVR-sUXw-4gfw-lb2v-cq0j-M5ey-Ct7td3
# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root data -wi-ao---- <5.50g
# lvdisplay
--- Logical volume ---
LV Path /dev/data/root
LV Name root
VG Name data
LV UUID i3eMbC-rcm1-H2Gm-JJeF-jRxO-nL9h-toHSHQ
LV Write Access read/write
LV Creation host, time localhost, 2018-09-28 14:42:55 +0000
LV Status available
# open 1
LV Size <5.50 GiB
Current LE 1407
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
如何将物理卷、卷组以及最后的分区一起缩小到删除逻辑卷后的可用空间大小?最好应该指定相对值(到pvresize
?)或类似的东西lvextend -l 100%FREE <lvolume>
。我还想单独使用命令行(没有 GUI)来完成此任务。还值得注意的是,根/系统逻辑卷始终处于活动状态并在使用中。
答案1
嗯,pvresize
没有像lvextend
那样的相对值选项,所以你需要指定你想要的确切大小。您可以执行以下操作:
- 缩小物理体积:
pvresize --setphysicalvolumesize 5.5G /dev/sda2
- 使用您选择的工具缩小分区。如果你想编写脚本,可以使用parted。将分区设置为比 5.5G 稍大一点,以考虑计算字节大小的差异,或者确保在两个工具中使用相同的单位。
- 如果工具之间的单位不同,请扩展物理卷以占用整个分区:
pvresize /dev/sda2