此时,我们要放大文件系统/u01的大小,那么就需要使用到lvresize 放大LV容量
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代码如下:
[root@localhost ~]# lvscan
ACTIVE '/dev/VolGroup02/LogVol00' [32.00 MiB] inherit
[root@localhost ~]# lvdisplay /dev/VolGroup02/LogVol00
(本文来源于图老师网站,更多请访问http://m.tulaoshi.com/fuwuqi/)--- Logical volume ---
LV Path /dev/VolGroup02/LogVol00
LV Name LogVol00
VG Name VolGroup02
LV UUID OCHwx1-EL9P-6C5J-RNuz-2Xu5-4215-H3xt5s
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2015-09-01 10:50:10 +0800
LV Status available
# open 1
LV Size 32.00 MiB
Current LE 1
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
[root@localhost ~]# lvresize -L +7.89G /dev/VolGroup02/LogVol00
Rounding size to boundary between physical extents: 7.91 GiB
Size of logical volume VolGroup02/LogVol00 changed from 32.00 MiB (1 extents) to 7.94 GiB (254 extents).
Logical volume LogVol00 successfully resized
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代码如下:
[root@localhost ~]# resize2fs -p /dev/VolGroup02/LogVol00
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/VolGroup02/LogVol00 is mounted on /u01; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 32
Performing an on-line resize of /dev/VolGroup02/LogVol00 to 8323072 (1k) blocks.
The filesystem on /dev/VolGroup02/LogVol00 is now 8323072 blocks long.
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 27G 6.0G 20G 24% /
tmpfs 5.9G 0 5.9G 0% /dev/shm
/dev/sda1 477M 32M 420M 8% /boot
/dev/sdb1 99G 60M 94G 1% /home
/dev/mapper/VolGroup02-LogVol00
7.7G 2.7M 7.3G 1% /u01
如果我们此时在虚拟机上将磁盘从8G扩展为10G,那么要如何利用扩展的磁盘空间呢?
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代码如下:
[root@localhost u01]# fdisk -l
Disk /dev/sda: 42.9 GB, 42949672960 bytes
64 heads, 32 sectors/track, 40960 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000462cf
Device Boot Start End Blocks Id System
/dev/sda1 * 2 501 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 502 28672 28847104 83 Linux
Partition 2 does not end on cylinder boundary.
/dev/sda3 28673 40960 12582912 82 Linux swap / Solaris
Partition 3 does not end on cylinder boundary.
Disk /dev/sdc: 8589 MB, 8589934592 bytes
64 heads, 32 sectors/track, 8192 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x98c391fe
Device Boot Start End Blocks Id System
/dev/sdc1 1 8192 8388592 83 Linux
Disk /dev/sdb: 107.4 GB, 107374182400 bytes
255 heads, 63 sectors/track, 13054 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0002488e
Device Boot Start End Blocks Id System
/dev/sdb1 1 13055 104856576 83 Linux
Disk /dev/mapper/VolGroup02-LogVol00: 33 MB, 33554432 bytes
255 heads, 63 sectors/track, 4 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
重启过后才能看到/dev/sdc的空间变化情况。
删除物理卷
删除卷LVM管理中的命令vgreduce, pvremove:
vgreduce:通过删除LVM卷组中的物理卷来减少卷组容量。注意:不能删除LVM卷组中剩余的最后一个物理卷
pvremove: 用于删除一个存在的物理卷。使用pvremove指令删除物理卷时,它将LVM分区上的物理卷信息删除,使其不再被视为一个物理卷。
在删除物理卷PV之前,必须将服务器的分区信息、卷组信息、物理卷信息、逻辑卷信息都掌握清楚,避免出现失误或误操作。
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代码如下:
[root@localhost ~]# fdisk -l
Disk /dev/sda: 128.8 GB, 128849018880 bytes
(本文来源于图老师网站,更多请访问http://m.tulaoshi.com/fuwuqi/)255 heads, 63 sectors/track, 15665 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 10443 83778975 8e Linux LVM
/dev/sda3 10444 15665 41945715 83 Linux
[root@localhost ~]# vgscan
Reading all physical volumes. This may take a while...
Found volume group "VolGroup00" using metadata type lvm2
[root@localhost ~]# pvscan
PV /dev/sda2 VG VolGroup00 lvm2 [79.88 GB / 0 free]
PV /dev/sda3 VG VolGroup00 lvm2 [40.00 GB / 40.00 GB free]
Total: 2 [119.88 GB] / in use: 2 [119.88 GB] / in no VG: 0 [0 ]
[root@localhost ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name VolGroup00
PV Size 79.90 GB / not usable 23.41 MB
Allocatable yes (but full)
PE Size (KByte) 32768
Total PE 2556
Free PE 0
Allocated PE 2556
PV UUID YGtB2J-ZKJr-mV62-NluQ-2DGy-vuUT-cCc1lo
--- Physical volume ---
PV Name /dev/sda3
VG Name VolGroup00
PV Size 40.00 GB / not usable 2.61 MB
Allocatable yes
PE Size (KByte) 32768
Total PE 1280
Free PE 1280
Allocated PE 0
PV UUID wsnv13-7j1H-SH8q-hl6k-HpNc-x4WU-gM7LzW
[root@localhost ~]# lvscan
ACTIVE '/dev/VolGroup00/LogVol00' [77.91 GB] inherit
ACTIVE '/dev/VolGroup00/LogVol01' [1.97 GB] inherit
[root@localhost ~]# lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
LogVol00 VolGroup00 -wi-ao 77.91G
LogVol01 VolGroup00 -wi-ao 1.97G
vgreduce参数:
-a:如果命令行中没有指定要删除的物理卷,则删除所有的空物理卷;
--removemissing:删除卷组中丢失的物理卷,使卷组恢复正常状态。
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代码如下:
[root@localhost ~]# vgreduce VolGroup00 /dev/sda3
Removed "/dev/sda3" from volume group "VolGroup00"
[root@localhost ~]#
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代码如下:
[root@localhost ~]# pvscan
PV /dev/sda2 VG VolGroup00 lvm2 [79.88 GB / 0 free]
PV /dev/sda3 lvm2 [40.00 GB]
Total: 2 [119.88 GB] / in use: 1 [79.88 GB] / in no VG: 1 [40.00 GB]
[root@localhost ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 VolGroup00 lvm2 a- 79.88G 0
/dev/sda3 lvm2 a- 40.00G 40.00G
[root@localhost ~]# pvremove /dev/sda3
Labels on physical volume "/dev/sda3" successfully wiped
[root@localhost ~]# pvscan
PV /dev/sda2 VG VolGroup00 lvm2 [79.88 GB / 0 free]
Total: 1 [79.88 GB] / in use: 1 [79.88 GB] / in no VG: 0 [0 ]