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重新安装操作系统后重新挂载lvm分区

tag-icon • tag-icon linux-mint partition fdisk lvm
重新安装操作系统后重新挂载lvm分区

我最近从 Ubuntu 升级到 Linux Mint。我已经覆盖/dev/sda2了Ubuntu。我之前opt从virtualization/dev/sda1创建了两个逻辑卷。我忘记进行lvm分区元数据备份。但看起来当我安装时lvm2，它设法恢复了这个元数据。

  1. 我如何将这些逻辑卷安装到/opt和/virtualization？
  2. 另外，如何lvm2设法恢复分区元数据？

卷组备份文件

vg1 {
    id = "d0LGSW-hGoz-mc9W-nTc0-zjxc-bEgm-p3GrcT"
    seqno = 3
    format = "lvm2" # informational
    status = ["RESIZEABLE", "READ", "WRITE"]
    flags = []
    extent_size = 8192      # 4 Megabytes
    max_lv = 0
    max_pv = 0
    metadata_copies = 0

    physical_volumes {

        pv0 {
            id = "ZuOjKi-Ya6m-ES2J-jS5P-KwsS-4H51-MUPEL7"
            device = "/dev/sda1"    # Hint only

            status = ["ALLOCATABLE"]
            flags = []
            dev_size = 101810176    # 48.5469 Gigabytes
            pe_start = 384
            pe_count = 12427    # 48.543 Gigabytes
        }
    }

    logical_volumes {

        opt {
            id = "cGkl9d-aCdR-N5Dx-U7kb-sDaG-XVWL-JRpGQS"
            status = ["READ", "WRITE", "VISIBLE"]
            flags = []
            segment_count = 1

            segment1 {
                start_extent = 0
                extent_count = 6400 # 25 Gigabytes

                type = "striped"
                stripe_count = 1    # linear

                stripes = [
                    "pv0", 0
                ]
            }
        }

        virtualization {
            id = "cHHxE0-hYlf-pg3o-1fTi-ZdkC-GPJv-gYIbOx"
            status = ["READ", "WRITE", "VISIBLE"]
            flags = []
            segment_count = 1

            segment1 {
                start_extent = 0
                extent_count = 5888 # 23 Gigabytes

                type = "striped"
                stripe_count = 1    # linear

                stripes = [
                    "pv0", 6400
                ]
            }
        }
    }
}

/etc/fstab

# <file system> <mount point>   <type>  <options>       <dump>  <pass>
proc            /proc           proc    nodev,noexec,nosuid 0       0
# / was on /dev/sda2 during installation
UUID=a499863a-0110-4a2f-9624-c128e0124836 /               ext4    errors=remount-ro 0       1
# /home was on /dev/sda4 during installation
UUID=0c9bdfe0-0801-4704-b1e1-9719845f3cc3 /home           ext4    defaults        0       2
# swap was on /dev/sda5 during installation
UUID=7cecc37b-4256-4c08-a47a-ea4849f768eb none            swap    sw              0       0

fdisk 列表

Disk /dev/sda: 128.0 GB, 128035676160 bytes
255 heads, 63 sectors/track, 15566 cylinders, total 250069680 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
Disk identifier: 0x742feb57

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1            2048   101812223    50905088   83  Linux
/dev/sda2   *   101812224   160405503    29296640   83  Linux
/dev/sda3       199469054   226631679    13581313    5  Extended
/dev/sda4       160405504   199467007    19530752   83  Linux
/dev/sda5       199469056   226631679    13581312   82  Linux swap / Solaris

扫描

pvscan
  PV /dev/sda1   VG vg1   lvm2 [48.54 GiB / 556.00 MiB free]
  Total: 1 [48.54 GiB] / in use: 1 [48.54 GiB] / in no VG: 0 [0   ]
vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "vg1" using metadata type lvm2
lvscan
  inactive          '/dev/vg1/opt' [25.00 GiB] inherit
  inactive          '/dev/vg1/virtualization' [23.00 GiB] inherit

答案1

LVM 不关心分区元数据。它检查块设备的内容（例如分区）是否有签名，表明该块设备是 LVM 物理卷。如果您没有删除该签名，LVM 会找到它，并且您的新发行版的脚本会自动组装可见卷。

如果您覆盖了物理卷的一部分，即使内部逻辑卷部分损坏，LVM 也可能会找到签名，从而导致部分或全部内容不可读。

逻辑卷未激活（这可能表明它们已损坏）。运行vgchange -ay vg1以激活卷组（我认为它已经处于活动状态，因此您不需要它）并lvchange -ay vg1/opt vg1/virtualization激活逻辑卷。然后您可以运行mount /dev/mapper/vg1-opt /opt并mount /dev/mapper/vg1-virtualization /virtualization挂载文件系统。

如果要将物理卷标记为已删除，请pvremove在其上运行以擦除 LVM 签名。

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