/dev/mapper 中没有逻辑卷 - 无法显示它

2024-6-10 • tag-icon

我继承了一个 Ubuntu kvm 服务器：

# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 14.04.3 LTS
Release:    14.04
Codename:   trusty

... 在启动时会给我们一个无法安装分区的错误，让我选择跳过或手动恢复。我不确定如何手动恢复？

该系统有两个 RAID 镜像的物理驱动器。

在 fstab 中，我看到以下失败的条目：

/dev/mapper/primary-data /mnt/data       ext4    defaults        0       2

但是，该文件不在 /dev/mapper 中：

root@vmserver:/dev# ls -al /dev/mapper/
total 0
drwxr-xr-x  2 root root     120 May 18 11:07 .
drwxr-xr-x 18 root root    4680 May 18 11:10 ..
crw-------  1 root root 10, 236 May 18 11:07 control
lrwxrwxrwx  1 root root       7 May 18 11:07 primary-backup -> ../dm-5
lrwxrwxrwx  1 root root       7 May 18 11:07 primary-snap-cow -> ../dm-3
lrwxrwxrwx  1 root root       7 May 18 11:07 primary-system -> ../dm-0

当我运行 vgdisplay 时，我可以看到当前有 4 个 LV，但只有 2 个是打开的？

--- Volume group ---
VG Name               primary
System ID             
Format                lvm2
Metadata Areas        1
Metadata Sequence No  162
VG Access             read/write
VG Status             resizable
MAX LV                0
Cur LV                4
Open LV               2
Max PV                0
Cur PV                1
Act PV                1
VG Size               1.79 TiB
PE Size               4.00 MiB
Total PE              469222
Alloc PE / Size       458476 / 1.75 TiB
Free  PE / Size       10746 / 41.98 GiB
VG UUID               ahmMej-0Pzn-V9Fk-0utn-q8PV-K7PU-AWxTQ1

如果我运行vgscan --mknodes，我会得到这个输出：

root@vmserver:/dev# vgscan -v --mknodes
    Wiping cache of LVM-capable devices
    Wiping internal VG cache
  Reading all physical volumes.  This may take a while...
    Finding all volume groups
    Finding volume group "primary"
  Found volume group "primary" using metadata type lvm2
    Finding all logical volumes
  The link /dev/primary/data should had been created by udev but it was not found. Falling back to direct link creation.
  The link /dev/primary/snap should had been created by udev but it was not found. Falling back to direct link creation.

然后，/dev/mapper 的内容如下所示：

root@vmserver:/dev# ls -al /dev/mapper/
total 0
drwxr-xr-x  2 root root      180 May 18 11:31 .
drwxr-xr-x 18 root root     4680 May 18 11:10 ..
crw-------  1 root root  10, 236 May 18 11:07 control
lrwxrwxrwx  1 root root        7 May 18 11:07 primary-backup -> ../dm-5
brw-rw----  1 root disk 252,   2 May 18 11:31 primary-data
brw-rw----  1 root disk 252,   1 May 18 11:31 primary-data-real
brw-rw----  1 root disk 252,   4 May 18 11:31 primary-snap
lrwxrwxrwx  1 root root        7 May 18 11:07 primary-snap-cow -> ../dm-3
lrwxrwxrwx  1 root root        7 May 18 11:07 primary-system -> ../dm-0

此时，如果我运行mount -a，我现在可以查看挂载点 /mnt/data 处的分区。但是，这在重启后不会消失。

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