我对 LVM 还不太熟悉。我有一个硬盘，需要挂载它来恢复一些重要文件。这个硬盘最初来自 Centrix Xenserver。
fdisk -l这是磁盘的输出：
Disk /dev/sda: 232,9 GiB, 250059350016 bytes, 488397168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 632C984D-FC9D-4C44-B208-D7BE709FCFA5
Device Start End Sectors Size Type
/dev/sda1 2048 8388641 8386594 4G Microsoft basic data
/dev/sda2 8390656 16777249 8386594 4G Microsoft basic data
/dev/sda3 16779264 488397134 471617871 224,9G Linux LVM
lvscan：
$ sudo lvscan
/run/lvm/lvmetad.socket: connect failed: No such file or directory
WARNING: Failed to connect to lvmetad. Falling back to internal scanning.
Couldn't find device with uuid QIMtBk-31kl-2Hun-tOsy-AgO1-X20n-Q3Tvn2.
ACTIVE '/dev/VG_XenStorage-e87e45db-88b6-fe01-9d35-c19431cee0f3/MGT' [4,00 MiB] inherit
ACTIVE '/dev/VG_XenStorage-e87e45db-88b6-fe01-9d35-c19431cee0f3/VHD-100b96bd-dd71-4c78-b8fd-3c9bb7ad6ae2' [100,20 GiB] inherit
ACTIVE '/dev/VG_XenStorage-e87e45db-88b6-fe01-9d35-c19431cee0f3/VHD-ee59b325-a97a-48f2-a0b1-7228a0bb59b3' [100,20 GiB] inherit
ACTIVE '/dev/VG_XenStorage-e87e45db-88b6-fe01-9d35-c19431cee0f3/VHD-203138b3-2d2d-4a25-ad6b-70ebc0936468' [256,00 MiB] inherit
ACTIVE '/dev/VG_XenStorage-e87e45db-88b6-fe01-9d35-c19431cee0f3/VHD-d4cd0880-562d-4f0b-a7bf-86a755f351b3' [16,00 MiB] inherit
lv显示：
$ sudo lvdisplay
/run/lvm/lvmetad.socket: connect failed: No such file or directory
WARNING: Failed to connect to lvmetad. Falling back to internal scanning.
Couldn't find device with uuid QIMtBk-31kl-2Hun-tOsy-AgO1-X20n-Q3Tvn2.
--- Logical volume ---
LV Path /dev/VG_XenStorage-e87e45db-88b6-fe01-9d35-c19431cee0f3/MGT
LV Name MGT
VG Name VG_XenStorage-e87e45db-88b6-fe01-9d35-c19431cee0f3
LV UUID 5BrqYB-oJkA-DZtI-y0PK-eE0s-gJyS-eTOOT5
LV Write Access read/write
LV Creation host, time ,
LV Status available
# open 0
LV Size 4,00 MiB
Current LE 1
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:0
--- Logical volume ---
LV Path /dev/VG_XenStorage-e87e45db-88b6-fe01-9d35-c19431cee0f3/VHD-100b96bd-dd71-4c78-b8fd-3c9bb7ad6ae2
LV Name VHD-100b96bd-dd71-4c78-b8fd-3c9bb7ad6ae2
VG Name VG_XenStorage-e87e45db-88b6-fe01-9d35-c19431cee0f3
LV UUID 7C6FGC-LjEb-Dzjx-02Aa-OE0M-zTTk-Z0GxHS
LV Write Access read/write
LV Creation host, time ,
LV Status available
# open 0
LV Size 100,20 GiB
Current LE 25652
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:1
--- Logical volume ---
LV Path /dev/VG_XenStorage-e87e45db-88b6-fe01-9d35-c19431cee0f3/VHD-ee59b325-a97a-48f2-a0b1-7228a0bb59b3
LV Name VHD-ee59b325-a97a-48f2-a0b1-7228a0bb59b3
VG Name VG_XenStorage-e87e45db-88b6-fe01-9d35-c19431cee0f3
LV UUID cOtP3z-MEqC-BjMI-EnTB-E3jO-sU01-3I03hD
LV Write Access read/write
LV Creation host, time ,
LV Status available
# open 0
LV Size 100,20 GiB
Current LE 25652
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:2
--- Logical volume ---
LV Path /dev/VG_XenStorage-e87e45db-88b6-fe01-9d35-c19431cee0f3/VHD-203138b3-2d2d-4a25-ad6b-70ebc0936468
LV Name VHD-203138b3-2d2d-4a25-ad6b-70ebc0936468
VG Name VG_XenStorage-e87e45db-88b6-fe01-9d35-c19431cee0f3
LV UUID gx1AhN-Ebx9-yTnz-xWEQ-18F9-19Ct-Xd0h5V
LV Write Access read/write
LV Creation host, time ,
LV Status available
# open 0
LV Size 256,00 MiB
Current LE 64
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:3
--- Logical volume ---
LV Path /dev/VG_XenStorage-e87e45db-88b6-fe01-9d35-c19431cee0f3/VHD-d4cd0880-562d-4f0b-a7bf-86a755f351b3
LV Name VHD-d4cd0880-562d-4f0b-a7bf-86a755f351b3
VG Name VG_XenStorage-e87e45db-88b6-fe01-9d35-c19431cee0f3
LV UUID lmayRw-hJyh-GrXy-hjEU-m7lc-f3XU-F2N9Ar
LV Write Access read/write
LV Creation host, time ,
LV Status available
# open 0
LV Size 16,00 MiB
Current LE 4
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:4
和 vgdisplay：
$ sudo vgdisplay
/run/lvm/lvmetad.socket: connect failed: No such file or directory
WARNING: Failed to connect to lvmetad. Falling back to internal scanning.
Couldn't find device with uuid QIMtBk-31kl-2Hun-tOsy-AgO1-X20n-Q3Tvn2.
--- Volume group ---
VG Name VG_XenStorage-e87e45db-88b6-fe01-9d35-c19431cee0f3
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 41
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 5
Open LV 0
Max PV 0
Cur PV 2
Act PV 1
VG Size 457,75 GiB
PE Size 4,00 MiB
Total PE 117184
Alloc PE / Size 51373 / 200,68 GiB
Free PE / Size 65811 / 257,07 GiB
VG UUID uuMOc2-J8cU-9fOO-zoda-stQz-xKhh-mjYnd1
当我尝试安装时，我得到了这个：
$ sudo mount /dev/VG_XenStorage-e87e45db-88b6-fe01-9d35-c19431cee0f3/VHD-100b96bd-dd71-4c78-b8fd-3c9bb7ad6ae2 /media/lvm/
mount: wrong fs type, bad option, bad superblock on /dev/mapper/VG_XenStorage--e87e45db--88b6--fe01--9d35--c19431cee0f3-VHD--100b96bd--dd71--4c78--b8fd--3c9bb7ad6ae2,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so.
有人能指出哪里错了吗？谢谢。