連結： http://blog.itpub.net/28602568/viewspace-1797429/

標題： Linux 報錯"mount: unknown filesystem type 'LVM2_member' "解決思路

前言：

同事叫把/dev/sda7 磁碟掛載到/data目錄，當執行mount時報"mount: unknown filesystem type 'LVM2_member' "錯，如下為解決方案和思路；

LVM詳細資訊：(簡體中文)

註釋：報錯有提到為識別filesystem type 'LVM2_member' 磁碟；

情況1 未建立邏輯卷/卷組和格式化分割槽引起 -->本次問題

情況2 邏輯卷卷狀態資訊失效'unenable'

列出/dev/sda7分割槽資訊：

[root@Database-backup ~]# fdisk -l| grep sda7
/dev/sda7 17258 91380 595382272 8e Linux LVM
[root@Database-backup ~]#

復現報錯：

[root@Database-backup ~]# mount /dev/sda7 /data/
mount: unknown filesystem type 'LVM2_member'
[root@Database-backup ~]#

情況1

檢視物理卷：

[root@Database-backup ~]# pvdisplay

"/dev/sda7" is a new physical volume of "567.80 GiB"
--- NEW Physical volume ---
PV Name               /dev/sda7
VG Name -->沒資料...
PV Size               567.80 GiB
Allocatable           NO
PE Size               0
Total PE              0
Free PE               0
Allocated PE          0
PV UUID               2N99xd-jlWG-Yo1e-kAbI-DsmL-syyd-At8EHx

[root@Database-backup ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda7 lvm2 a-- 567.80g 567.80g
[root@Database-backup ~]#

檢視邏輯卷
[root@Database-backup ~]# lvdisplay
No volume groups found
[root@Database-backup ~]#

檢視卷組

[root@Database-backup ~]# vgs
No volume groups found

[root@Database-backup ~]#

*** 建立卷組/邏輯卷~ 即可解決本次mount 報錯問題

建立卷組

[root@Database-backup ~]# vgcreate vgdata /dev/sda7 ##vgdata為卷組名
Volume group "vgdata" successfully created

[root@Database-backup ~]#

檢視建立結果

[root@Database-backup ~]# vgs
VG #PV #LV #SN Attr VSize VFree
vgdata 1 0 0 wz--n- 567.80g 567.80g

[root@Database-backup ~]# vgdisplay
--- Volume group ---
VG Name               vgdata
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               567.80 GiB
PE Size               4.00 MiB
Total PE              145356
Alloc PE / Size       0 / 0
Free PE / Size       145356 / 567.80 GiB
VG UUID               DE9P00-BZTa-n80p-tdVJ-M1dA-6iOW-lif2Ye

[root@Database-backup ~]#

建立邏輯卷：

[root@Database-backup ~]# lvcreate -L 559G vgdata -n lvolhome /dev/sda7

[root@Database-backup ~]# lvdisplay

[root@Database-backup ~]# mount /dev/sda7 /data/

mount: unknown filesystem type 'LVM2_member'
[root@Database-backup ~]#

格式化分割槽：

[root@Database-backup ~]# mkfs.ext4 /dev/sda7
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
37216256 inodes, 148845568 blocks
7442278 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
4543 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
     32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
     4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
     102400000

Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 24 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
[root@Database-backup ~]#

再掛載：

[root@Database-backup ~]# mount /dev/sda7   /data/
[root@Database-backup ~]# df -hl
Filesystem      Size Used Avail Use% Mounted on
/dev/sda2        50G 374M   47G   1% /
tmpfs           939M     0 939M   0% /dev/shm
/dev/sda1       194M   28M 157M 15% /boot
/dev/sda3        40G 544M   37G   2% /usr
/dev/sda5        40G 197M   38G   1% /var
/dev/sda7       559G 198M 531G   1% /data
[root@Database-backup ~]#

情況2參考部落格 http://blog.csdn.net/vah101/article/details/6372481

【源於本人筆記】若有書寫錯誤，表達錯誤，請指正...

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Linux 報錯"mount: unknown filesystem type

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