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            Linux中的LVM之增加容量与删除卷的方法详解

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                放大LV容量涉及到LVM治理中的下令lvresize  ,我们先建立一个卷组VG VolGroup02 ,它建设在磁盘/dev/sdc (巨细为8G)上  。建立逻辑卷LV时  ,我们居心只使用了一小部门 。详细情形如下所示

                复制代码

                代码如下:

                [root@localhost ~]# vgdisplay

                --- Volume group ---

                VG Name VolGroup02

                System ID

                Format lvm2

                Metadata Areas 1

                Metadata Sequence No 1

                VG Access read/write

                VG Status resizable

                MAX LV 0

                Cur LV 0

                Open LV 0

                Max PV 0

                Cur PV 1

                Act PV 1

                VG Size 7.97 GiB

                PE Size 32.00 MiB

                Total PE 255

                Alloc PE / Size 0 / 0

                Free PE / Size 255 / 7.97 GiB

                VG UUID SETgjx-dobd-Uayt-AWgN-HKID-hsYe-tEotIS

                [root@localhost ~]# lvcreate -L7.97 -n LogVol00 VolGroup02

                Rounding up size to full physical extent 32.00 MiB

                Logical volume "LogVol00" created

                [root@localhost ~]# mkfs -t ext4 /dev/VolGroup02/LogVol00

                mke2fs 1.41.12 (17-May-2010)

                Filesystem label=

                OS type: Linux

                Block size=1024 (log=0)

                Fragment size=1024 (log=0)

                Stride=0 blocks, Stripe width=0 blocks

                8192 inodes, 32768 blocks

                1638 blocks (5.00%) reserved for the super user

                First data block=1

                Maximum filesystem blocks=33554432

                4 block groups

                8192 blocks per group, 8192 fragments per group

                2048 inodes per group

                Superblock backups stored on blocks:

                8193, 24577

                Writing inode tables: done

                Creating journal (4096 blocks): done

                Writing superblocks and filesystem accounting information: done

                This filesystem will be automatically checked every 23 mounts or

                180 days, whichever comes first. Use tune2fs -c or -i to override.

                [root@localhost ~]# cd /

                [root@localhost /]# mkdir /u01

                [root@localhost /]# mount /dev/VolGroup02/LogVol00 /u01

                [root@localhost /]# vi /etc/fstab

                #

                # /etc/fstab

                # Created by anaconda on Mon Aug 17 15:08:21 2015

                #

                # Accessible filesystems, by reference, are maintained under '/dev/disk'

                # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info

                #

                UUID=3440ad55-6486-45ed-876f-e942b08013bf / ext4 defaults 1 1

                UUID=d3abb655-db70-4c42-967d-57c421abfda0 /boot ext4 defaults 1 2

                UUID=660624ff-335d-42ca-b779-f130a80d9da8 /home ext4 defaults 1 2

                UUID=6f534bf0-e486-4937-84ae-ed1221cf34f1 swap swap defaults 0 0

                /dev/VolGroup02/LogVol00 /u01 ext4 defaults 1 1

                tmpfs /dev/shm tmpfs defaults 0 0

                devpts /dev/pts devpts gid=5,mode=620 0 0

                sysfs /sys sysfs defaults 0 0

                proc /proc proc defaults 0 0

                此时  ,我们要放大文件系统/u01的巨细  ,那么就需要使用到lvresize 放大LV容量

                复制代码

                代码如下:

                [root@localhost ~]# lvscan

                ACTIVE '/dev/VolGroup02/LogVol00' [32.00 MiB] inherit

                [root@localhost ~]# lvdisplay /dev/VolGroup02/LogVol00

                --- 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

                复制代码

                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

                若是我们此时在虚拟机上将磁盘从8G扩展为10G  ,那么要怎样使用扩展的磁盘空间呢?

                复制代码

                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

                重启事后才气看到/dev/sdc的空间转变情形  。

                删除物理卷

                删除卷LVM治理中的下令vgreduce, pvremove:

                vgreduce:通过删除LVM卷组中的物理卷来淘汰卷组容量  。注重: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晰  ,制止泛起失误或误操作  。

                复制代码

                代码如下:

                [root@localhost ~]# fdisk -l

                Disk /dev/sda: 128.8 GB, 128849018880 bytes

                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:若是下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  。

                复制代码

                代码如下:

                [root@localhost ~]# vgreduce VolGroup00 /dev/sda3

                Removed "/dev/sda3" from volume group "VolGroup00"

                [root@localhost ~]#

                复制代码

                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 ]