LinuxLVM学习总结&mdash;&mdash;放大LV容量

2024-06-28 14:31:32

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本篇介绍LVM管理中的命令lvresize，我们先创建一个卷组VG VolGroup02，它建立在磁盘/dev/sdc （大小为8G）上。创建逻辑卷LV时，我们故意只使用了一小部分。具体情况如下所示

[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/LogVol00mke2fs 1.41.12 (17-May-2010)Filesystem label=OS type: linuxBlock size=1024 (log=0)Fragment size=1024 (log=0)Stride=0 blocks, Stripe width=0 blocks8192 inodes, 32768 blocks1638 blocks (5.00%) reserved for the super userFirst data block=1Maximum filesystem blocks=335544324 block groups8192 blocks per group, 8192 fragments per group2048 inodes per groupSuperblock backups stored on blocks:         8193, 24577 Writing inode tables: done                            Creating journal (4096 blocks): doneWriting superblocks and filesystem accounting information: done This filesystem will be automatically checked every 23 mounts or180 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 1UUID=d3abb655-db70-4c42-967d-57c421abfda0 /boot                   ext4    defaults        1 2UUID=660624ff-335d-42ca-b779-f130a80d9da8 /home                   ext4    defaults        1 2UUID=6f534bf0-e486-4937-84ae-ed1221cf34f1 swap                    swap    defaults        0 0/dev/VolGroup02/LogVol00                  /u01                    ext4    defaults        1 1tmpfs                   /dev/shm                tmpfs   defaults        0 0devpts                  /dev/pts                devpts  gid=5,mode=620  0 0sysfs                   /sys                    sysfs   defaults        0 0PRoc                    /proc                   proc    defaults        0 0

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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

[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

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 [root@localhost ~]# resize2fs -p /dev/VolGroup02/LogVol00resize2fs 1.41.12 (17-May-2010)Filesystem at /dev/VolGroup02/LogVol00 is mounted on /u01; on-line resizing requiredold desc_blocks = 1, new_desc_blocks = 32Performing 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 -hFilesystem            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

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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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[root@localhost u01]# fdisk -l Disk /dev/sda: 42.9 GB, 42949672960 bytes64 heads, 32 sectors/track, 40960 cylindersUnits = cylinders of 2048 * 512 = 1048576 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x000462cf    Device Boot      Start         End      Blocks   Id  System/dev/sda1   *           2         501      512000   83  LinuxPartition 1 does not end on cylinder boundary./dev/sda2             502       28672    28847104   83  LinuxPartition 2 does not end on cylinder boundary./dev/sda3           28673       40960    12582912   82  Linux swap / SolarisPartition 3 does not end on cylinder boundary. Disk /dev/sdc: 8589 MB, 8589934592 bytes64 heads, 32 sectors/track, 8192 cylindersUnits = cylinders of 2048 * 512 = 1048576 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x98c391fe    Device Boot      Start         End      Blocks   Id  System/dev/sdc1               1        8192     8388592   83  Linux Disk /dev/sdb: 107.4 GB, 107374182400 bytes255 heads, 63 sectors/track, 13054 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x0002488e    Device Boot      Start         End      Blocks   Id  System/dev/sdb1               1       13055   104856576   83  Linux Disk /dev/mapper/VolGroup02-LogVol00: 33 MB, 33554432 bytes255 heads, 63 sectors/track, 4 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000

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重启过后才能看到/dev/sdc的空间变化情况。

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新建分区

[root@localhost ~]# fdisk /dev/sdc

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to

         switch off the mode (command 'c') and change display units to

         sectors (command 'u').

Command (m for help): p

Disk /dev/sdc: 10.7 GB, 10737418240 bytes

64 heads, 32 sectors/track, 10240 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

Command (m for help): n

Command action

   e   extended

   p   primary partition (1-4)

Partition number (1-4): 2

First cylinder (8193-10240, default 8193):

Using default value 8193

Last cylinder, +cylinders or +size{K,M,G} (8193-10240, default 10240):

Using default value 10240

Command (m for help): p

Disk /dev/sdc: 10.7 GB, 10737418240 bytes

64 heads, 32 sectors/track, 10240 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

/dev/sdc2            8193       10240     2097152   83  Linux

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.

The kernel still uses the old table. The new table will be used at

the next reboot or after you run partprobe(8) or kpartx(8)

Syncing disks.

新建物理卷PV

[root@localhost ~]# pvcreate /dev/sdc2  Physical volume "/dev/sdc2" successfully created

放大VG容量

[root@localhost ~]# vgextend  /dev/mapper/VolGroup02  /dev/sdc2  Volume group "VolGroup02" successfully extended

放大LV容量

 [root@localhost ~]# pvscan  PV /dev/sdc1   VG VolGroup02   lvm2 [7.97 GiB / 32.00 MiB free]  PV /dev/sdc2   VG VolGroup02   lvm2 [1.97 GiB / 1.97 GiB free]  Total: 2 [9.94 GiB] / in use: 2 [9.94 GiB] / in no VG: 0 [0   ] [root@localhost ~]# pvdisplay /dev/sdc2   --- Physical volume ---  PV Name               /dev/sdc2  VG Name               VolGroup02  PV Size               2.00 GiB / not usable 32.00 MiB  Allocatable           yes   PE Size               32.00 MiB  Total PE              63  Free PE               63  Allocated PE          0  PV UUID               qP1PGl-krr9-vCTY-vWgN-MsKL-rn1x-zAhmmc   [root@localhost ~]# lvextend -L +1.97G /dev/VolGroup02/LogVol00  Rounding size to boundary between physical extents: 2.00 GiB  Size of logical volume VolGroup02/LogVol00 changed from 7.94 GiB (254 extents) to 9.94 GiB (318 extents).  Logical volume LogVol00 successfully resized[root@localhost ~]# resize2fs /dev/VolGroup02/LogVol00resize2fs 1.41.12 (17-May-2010)Filesystem at /dev/VolGroup02/LogVol00 is mounted on /u01; on-line resizing requiredold desc_blocks = 32, new_desc_blocks = 40Performing an on-line resize of /dev/VolGroup02/LogVol00 to 10420224 (1k) blocks.The filesystem on /dev/VolGroup02/LogVol00 is now 10420224 blocks long. [root@localhost ~]# df -hFilesystem            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                      9.7G  2.5M  9.2G   1% /u01[root@localhost ~]# 