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Linux VPS下启用未使用的硬盘空间扩充LVM


2012-03-16 20:56:04 2,763 0 发表评论 字体: 作者:C.K.
标签: linuxLVM分区VPS硬盘

体验版 88 元,个人版 128 元,多用户版 288元个人版160元升级到多用户版。

SSH登陆后,查看现有分区、挂载及swap情况:
可以看到大概8G的硬盘空间分布情况

df -hal
  • free -m
  • [root@XenSystem ~]# df -hal
  • Filesystem Size Used Avail Use% Mounted on
  • /dev/mapper/VolGroup00-LogVol00
  • 5.7G 1.1G 4.4G 20% /
  • proc 0 0 0 - /proc
  • sysfs 0 0 0 - /sys
  • devpts 0 0 0 - /dev/pts
  • /dev/xvda1 99M 27M 67M 29% /boot
  • tmpfs 257M 0 257M 0% /dev/shm
  • none 0 0 0 - /proc/sys/fs/binfmt_misc
  • sunrpc 0 0 0 - /var/lib/nfs/rpc_pipefs
  • [root@XenSystem~]# free -m
  •             total       used       free     shared    buffers     cached
  • Mem:           512        506          5          0        447          9
  • -/+ buffers/cache:         49        463
  • Swap:         2079          0       2079
  • 查看硬盘设备列表:

    fdisk -l
    Disk /dev/xvdb: 23.6 GB, 23622320128 bytes
  • 255 heads, 63 sectors/track, 2871 cylinders
  • Units = cylinders of 16065 * 512 = 8225280 bytes
  • Disk /dev/xvdb doesn't contain a valid partition table
  • Disk /dev/xvda: 8589 MB, 8589934592 bytes
  • 255 heads, 63 sectors/track, 1044 cylinders
  • Units = cylinders of 16065 * 512 = 8225280 bytes
  •     Device Boot      Start         End      Blocks   Id  System
  • /dev/xvda1   *           1          13      104391   83  Linux
  • /dev/xvda2              14        1044     8281507+  8e  Linux LVM
  • 硬盘/dev/xvdb尚未划分使用,接下来我们为dev/xvdb分区

    fdisk /dev/xvdb
    [root@XenSystem ~]# fdisk /dev/xvdb
  • Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
  • Building a new DOS disklabel. Changes will remain in memory only,
  • until you decide to write them. After that, of course, the previous
  • content won't be recoverable.
  • The number of cylinders for this disk is set to 2871.
  • There is nothing wrong with that, but this is larger than 1024,
  • and could in certain setups cause problems with:
  • 1) software that runs at boot time (e.g., old versions of LILO)
  • 2) booting and partitioning software from other OSs
  •    (e.g., DOS FDISK, OS/2 FDISK)
  • Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
  • #输入n,新建分区

    Command (m for help): n

    #输入P,主分区

    Command action
  •    e   extended
  •    p   primary partition (1-4)
  • p
  • #目前是xvdb第一个分区输入1

    Partition number (1-4): 1

    #敲回车,默认就行了

    First cylinder (1-2871, default 1):
  • Using default value 1
  • Last cylinder or +size or +sizeM or +sizeK (1-2871, default 2871):
  • Using default value 2871
  • #这里输入t,指定分区的格式为8e (LVM)

    Command (m for help): t
  • Selected partition 1
  • Hex code (type L to list codes): 8e
  • Changed system type of partition 1 to 8e (Linux LVM)
  • #这里输入w,保存退出

    Command (m for help): w
  • The partition table has been altered!
  • Calling ioctl() to re-read partition table.
  • Syncing disks.
  • 重启使其生效

    reboot

    重启后,再次运行fdisk -l,可看到我们划分的xvdb1已经生效了

    [root@XenSystem]# fdisk -l
  • Disk /dev/xvdb: 23.6 GB, 23622320128 bytes
  • 255 heads, 63 sectors/track, 2871 cylinders
  • Units = cylinders of 16065 * 512 = 8225280 bytes
  • Device Boot Start End Blocks Id System
  • /dev/xvdb1 1 2871 23061276 8e Linux LVM
  • Disk /dev/xvda: 8589 MB, 8589934592 bytes
  • 255 heads, 63 sectors/track, 1044 cylinders
  • Units = cylinders of 16065 * 512 = 8225280 bytes
  • Device Boot Start End Blocks Id System
  • /dev/xvda1 * 1 13 104391 83 Linux
  • /dev/xvda2 14 1044 8281507+ 8e Linux LVM
  • 执行vgs查看卷组情况,可以看到只有一个卷组VolGroup00(此名称因系统而异)

    vgs
    [root@XenSystem ~]# vgs
  • VG #PV #LV #SN Attr VSize VFree
  • VolGroup00 2 2 0 wz--n- 49.84G 0
  • 创建物理卷,并将物理卷加入到组VolGroup00(此名称因系统而异)

    pvcreate /dev/xvdb1
  • vgextend VolGroup00 /dev/xvdb1
  • [root@XenSystem~]# pvcreate /dev/xvdb1
  •  Physical volume "/dev/xvdb1" successfully created
  • [root@XenSystem~]# vgextend VolGroup00 /dev/xvdb1
  •  Volume group "VolGroup00" successfully extended
  • 执行vgdisplay查看卷组空间情况

    vgdisplay
    [root@XenSystem~]# vgdisplay
  •  --- Volume group ---
  •   VG Name               VolGroup00
  •   System ID
  •   Format                lvm2
  •   Metadata Areas        2
  •   Metadata Sequence No  4
  •   VG Access             read/write
  •   VG Status             resizable
  •   MAX LV                0
  •   Cur LV                2
  •   Open LV               2
  •   Max PV                0
  •   Cur PV                2
  •   Act PV                2
  •   VG Size               29.84 GB
  •   PE Size               32.00 MB
  •   Total PE              955
  •   Alloc PE / Size       252 / 7.88 GB
  •   Free  PE / Size       703 / 21.97 GB
  •   VG UUID               jWlke0-R01B-RqBP-Qp1X-xxi0-ltOI-FompAt
  • 可以看到大概有21.97G的空间可以扩充使用,我们将卷组下的卷LogVol00扩容21.96G

    lvresize -L +21.96G /dev/VolGroup00/LogVol00
  • resize2fs /dev/VolGroup00/LogVol00
  • [root@XenSystem~]# lvresize -L +21.96G /dev/VolGroup00/LogVol00
  • Rounding up size to full physical extent 21.97 GB
  • Extending logical volume LogVol00 to 27.81 GB
  • Logical volume LogVol00 successfully resized
  • [root@XenSystem~]# resize2fs /dev/VolGroup00/LogVol00
  • resize2fs 1.39 (29-May-2006)
  • Filesystem at /dev/VolGroup00/LogVol00 is mounted on /; on-line resizing require d
  • Performing an on-line resize of /dev/VolGroup00/LogVol00 to 7290880 (4k) blocks.
  • The filesystem on /dev/VolGroup00/LogVol00 is now 7290880 blocks long.
  • 运行完成后,我们可以持到相应的空间已经扩展出来可以使用了

    [root@XenSystem~]# df -hal
  • Filesystem Size Used Avail Use% Mounted on
  • /dev/mapper/VolGroup00-LogVol00
  • 27G 1.1G 25G 5% /
  • proc 0 0 0 - /proc
  • sysfs 0 0 0 - /sys
  • devpts 0 0 0 - /dev/pts
  • /dev/xvda1 99M 27M 67M 29% /boot
  • tmpfs 257M 0 257M 0% /dev/shm
  • none 0 0 0 - /proc/sys/fs/binfmt_misc
  • sunrpc 0 0 0 - /var/lib/nfs/rpc_pipefs
  • 系统重装后的重装扩展处理!

    重装后,直接执行resize2fs进去动态扩容即可。

    resize2fs /dev/VolGroup00/LogVol00

    PVs missing导致LVM无法重新扩容的解决办法!

    运行vgextend、vgdisplay返回错误:

    Couldn't find device with uuid ************************
  • Cannot change VG VolGroup00 while PVs are missing.
  • 此时可以运行

    vgreduce VolGroup00  --removemissing

    然后重新扩容LVM即可

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