mount: unknown filesystem type ‘LVM2_member’

解决硬盘挂载报错:

mount: unknown filesystem type 'LVM2_member'
mount: you must specify the filesystem type

情况说明:

客户托管的服务器到机房,系统是Linux,无法启动,只能做系统恢复。询问后得知:

  • 数据盘有数据。无法全格。
  • 客户是小白,对Linux一点不懂。(既不懂如何管理)?

我的解决思路(保险起见):

上一块500G新硬盘,做上linux系统。将先前那块磁盘挂上去,之后拷贝数据。

下面开始。

查看磁盘情况:

[root@renwole-com ~]# fdisk -l

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 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: 0x000a9411

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          26      204800   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              26        6553    52428800   83  Linux
/dev/sda3            6553        7075     4194304   82  Linux swap / Solaris
/dev/sda4            7075       60802   431557656    5  Extended
/dev/sda5            7076       60802   431556608   83  Linux

Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 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: 0xa154a154

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *           1          64      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sdb2              64       60802   487873536   8e  Linux LVM

Disk /dev/mapper/VolGroup-lv_root: 53.7 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 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


Disk /dev/mapper/VolGroup-lv_home: 441.8 GB, 441765068800 bytes
255 heads, 63 sectors/track, 53708 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
...

说明:红色部分是以前系统坏的老盘。

安装 lvm2:

[root@renwole-com ~]# yum install lvm2 -y

查看物理卷:

[root@renwole-com ~]# pvs
PV         VG       Fmt  Attr PSize   PFree
/dev/sdb2  VolGroup lvm2 a--u 465.27g    0

查看卷组:

[root@renwole-com ~]# lvdisplay
--- Logical volume ---
LV Path                /dev/VolGroup/lv_root
LV Name                lv_root
VG Name                VolGroup
LV UUID                3Y5UYD-x0H9-F25h-foUz-rm0O-cgzl-pE8FbF
LV Write Access        read/write
LV Creation host, time localhost.localdomain, 2015-07-20 17:29:35 +0800
LV Status              available
# open                 0
LV Size                50.00 GiB
Current LE             12800
Segments               1
Allocation             inherit
Read ahead sectors     auto
- currently set to     256
Block device           253:0

--- Logical volume ---
LV Path                /dev/VolGroup/lv_home
LV Name                lv_home
VG Name                VolGroup
LV UUID                Eu7UKx-LPkM-RDQ6-ACym-KOOW-t2RC-oVq0Zn
LV Write Access        read/write
LV Creation host, time localhost.localdomain, 2015-07-20 17:29:56 +0800
LV Status              available
# open                 1
LV Size                411.43 GiB
Current LE             105325
Segments               1
Allocation             inherit
Read ahead sectors     auto
- currently set to     256
Block device           253:1

--- Logical volume ---
LV Path                /dev/VolGroup/lv_swap
LV Name                lv_swap
VG Name                VolGroup
LV UUID                PBkdrg-lhsO-vkde-RvC0-ryUh-p0pf-aMnBds
LV Write Access        read/write
LV Creation host, time localhost.localdomain, 2015-07-20 17:32:40 +0800
LV Status              available
# open                 0
LV Size                3.84 GiB
Current LE             984
Segments               1
Allocation             inherit
Read ahead sectors     auto
- currently set to     256
Block device           253:2

激活卷组:

[root@renwole-com ~]# vgchange -ay /dev/VolGroup
3 logical volume(s) in volume group "VolGroup" now active

挂载硬盘:

[root@renwole-com ~]# mount /dev/VolGroup/lv_home /apps/

/apps是我新建的目录。

查看挂载情况:

[root@renwole-com ~]# df -h
Filesystem                    Size  Used Avail Use% Mounted on
/dev/sda2                      50G  2.1G   45G   5% /
tmpfs                         3.9G     0  3.9G   0% /dev/shm
/dev/sda1                     194M   34M  151M  19% /boot
/dev/sda5                     406G  199M  385G   1% /home
/dev/mapper/VolGroup-lv_home  405G  199M  385G   1% /apps

进入apps目录一看,哇;数据还在,可喜可贺呀。

另外:如果挂载报错:

mount: you must specify the filesystem type

可以使用以下方法查看磁盘格式类型,然后加参数 -t 指定格式挂载即可。

[root@renwole-com ~]# file -s /dev/sda1
/dev/sda1: Linux rev 1.0 ext4 filesystem data (needs journal recovery) (extents) (huge files)

重要说明:

未找到合适的解决方案前,切勿对硬盘删分区,否则会损坏数据。
即便挂载成功,切勿使用mv或rm命令,请使用cp命令。
特别注意:在Linux下,若使用软件恢复数据,几乎是不现实的。

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