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Linux LVM(九):故障排查与数据恢复

  • 2026-08-20 08:21:47
Linux LVM(九):故障排查与数据恢复

字数 1702,阅读大约需 9 分钟

出问题不慌乱,本篇整理了 LVM 运维中最常见的故障、诊断方法和恢复步骤。

一、LVM 排查的"急救箱"

# 看 PV 状态
$ pvs
$ pvdisplay
$ pvs -a   # 包括 missing 的

# 看 VG 状态

$ vgs
$ vgdisplay
$ vgscan

# 看 LV 状态

$ lvs
$ lvs -a   # 包括隐藏的 internal LV
$ lvscan

# 看内核级 device-mapper 状态

$ dmsetup info
$ dmsetup ls
$ dmsetup table

# 看系统日志

$ dmesg | grep -i lvm
$ dmesg | grep -i dm-
$ journalctl -u lvm2-monitor

二、常见故障速查表

故障 1:VG 找不到 / "Volume group not found"

$ vgscan
  Reading all physical volumes.  This may take a while...
  No volume groups found

诊断

# 1. 设备还在吗?
$ ls -l /dev/sdb
$ fdisk -l /dev/sdb

# 2. PV 元数据在吗?

$ pvcreate --uuid <uuid> --restorefile /etc/lvm/backup/vg_data /dev/sdb

# 3. 看备份

$ ls /etc/lvm/backup/
$ cat /etc/lvm/backup/vg_data

修复:请参考后面会讲到的 vgcfgrestore命令。

故障 2:LV 无法激活 "Failed to activate"

$ lvchange -ay vg_data/lv_db
  Failed to activate lv_db

诊断

# 1. 看是否有 VG 缺失 PV
$ vgs --partial --verbose vg_data

# 2. 检查 PV

$ pvdisplay /dev/sdb

# 3. 强制激活(危险,可能丢数据)

$ lvchange -ay --partial vg_data/lv_db

故障 3:thin pool 满了,所有 thin LV 只读

$ touch /mnt/thin/test
  touch
: cannot touch '/mnt/thin/test': Read-only file system

修复

# 1. 看占用率
$ lvs -o lv_name,data_percent,metadata_percent vg_data

# 2. 清理大快照

$ lvremove /dev/vg_data/lv_old_snap

# 3. 扩 pool

$ lvextend -l +100%FREE vg_data/tp_data

# 4. thin LV 自动恢复可写

故障 4:device-mapper busy,无法卸载/激活

$ umount /mnt/lv_demo
  umount: /mnt/lv_demo: target is busy

诊断

# 看谁在用
$ lsof /mnt/lv_demo
$ fuser -m /mnt/lv_demo

# 看打开数

$ lvs -o lv_name,lv_attr vg_data
  # 第六位 'o' = open

修复

# 1. 杀掉进程
$ fuser -km /mnt/lv_demo

# 2. 强制卸载(仅 ext 系列,xfs 不支持)

$ umount -l /mnt/lv_demo

故障 5:PV 显示 "missing"

$ pvs
  PV         VG      Fmt  Attr PSize  PFree
  /dev/sdb   vg_data lvm2 a--  500.00g 0
  [unknown]  vg_data lvm2 a-m  500.00g 500.00g    # ← 缺失!

诊断

# 设备名变了?
$ ls -l /dev/sd*
$ dmesg | tail

# 找 LVM 元数据

$ pvscan
$ blkid | grep LVM2

修复

# 1. 如果盘还在但设备名变了
$ pvcreate --uuid "原 UUID" /dev/sdc    # 用新设备名恢复元数据

# 2. 找回 VG(详见后续章节)

$ vgcfgrestore vg_data

# 3. 移除 missing PV

$ vgreduce --removemissing --force vg_data

故障 6:快照 invalid

$ lvs
  LV            Attr       LSize   
  lv_demo_snap  swi-I-s--- 1.00g    # ← I = invalid

原因:snapshot area 写满。

修复

# 1. 删除失效快照
$ lvremove -f /dev/vg_data/lv_demo_snap

# 2. 重建

$ lvcreate -L 2G -s -n lv_demo_snap /dev/vg_data/lv_demo

三、诊断流程图

业务报错(如 FS 只读、LV 无法挂载)

├─ 看 dmesg / journalctl → 硬件层错误?
│   └─ 是:换盘 / 修复硬件

├─ pvs / vgs / lvs → LVM 状态异常?
│   ├─ missing PV → vgcfgrestore / vgreduce --removemissing
│   ├─ thin pool 满 → 扩 pool / 删快照
│   ├─ LV 不存在 → lvcreate 恢复
│   └─ 全部正常 → 检查 FS(见下方)

└─ df / mount → FS 错误?
    ├─ ext4: e2fsck 修复
    └─ xfs: xfs_repair 修复(必须先卸载)

四、备份恢复前的关键操作

# 1. 先备份 metadata(重要!)
$ vgcfgbackup vg_data    # 备份到默认位置

# 2. 把当前状态记录下来

$ pvs > /tmp/pvs.bak
$ vgs > /tmp/vgs.bak
$ lvs > /tmp/lvs.bak
$ lvs -a > /tmp/lvs-a.bak

# 3. 看 metadata 历史

$ ls -lt /etc/lvm/archive/vg_data_*.vg

# 4. 不要立刻操作!先看清楚

五、lvm 配置文件

/etc/lvm/lvm.conf 中关键字段:

# 备份路径
backup = 1
backup_dir = "/etc/lvm/backup"
archive_dir = "/etc/lvm/archive"

# 设备过滤器(经常出错!)

# 允许所有设备:

filter = [ "a|.*|" ]
# 拒绝 loop 设备:

# filter = [ "r|/dev/loop.*|", "a|.*|" ]

修改后必须重启或:

$ lvmetad -f   # 强制刷新(较老版本)

现代 lvm2 用 lvmpolld 或直接重启服务。

六、vgcfgrestore 救命的命令

这是 LVM 排错的"杀手锏"

6.1 看历史 metadata

$ ls -lt /etc/lvm/archive/vg_data_*.vg | head
-rw------- 1 root root 4096 Jun 23 02:00 vg_data_00010-1234567.vg
-rw------- 1 root root 4096 Jun 22 18:00 vg_data_00009-1234567.vg
-rw------- 1 root root 4096 Jun 21 12:00 vg_data_00008-1234567.vg

文件格式:vgname_<seq>-<uuid>.vg

6.2 看指定版本的 metadata

# 看 3 个改动前的版本
$ less /etc/lvm/archive/vg_data_00007-1234567.vg

内容是文本,类似:

contents = "Text Format Volume Group"
version = 1
description = "Created *before* executing 'lvextend...'"
creation_host = "server01"
creation_time = 1700000000
...
physical_volumes {
    pv0 {
        device = "/dev/sdb"
        ...
    }
    pv1 {
        device = "/dev/sdc"
        ...
    }
}
logical_volumes {
    lv_db {
        ...
    }
}

6.3 恢复到指定版本

# 1. 确认要恢复的版本
$ head -1 /etc/lvm/archive/vg_data_00007-1234567.vg
contents = "Text Format Volume Group"
version = 1
description = "Created *before* executing 'lvreduce /dev/vg_data/lv_db...'"

# 2. 恢复

$ vgcfgrestore -f /etc/lvm/archive/vg_data_00007-1234567.vg vg_data
  Restored volume group vg_data.

# 3. 激活

$ vgchange -ay vg_data

# 4. 验证

$ lvs vg_data

6.4 找不到正确的 backup?

# 看 metadata 的位置和 UUID
$ cat /etc/lvm/backup/vg_data | grep -i uuid

也可以从未损坏的 PV里恢复:

# 1. 看 PV 上的 metadata
$ pvs --verbose /dev/sdb

# 2. 用 PV 恢复

$ pvcreate --restorefile /etc/lvm/backup/vg_data --uuid <pv-uuid> /dev/sdb

七、PV 误删的恢复

# 场景:vgreduce 误删了 PV,VG 数据"消失"
# 1. 看 backup

$ ls /etc/lvm/backup/

# 2. 看 PV 上是否有残留的 metadata

$ strings /dev/sdb | grep -A 2 "LVM2"

如果 PV 上 metadata 还在:

# 用 metadata 重建 PV
$ pvcreate --uuid <原 UUID> --restorefile /etc/lvm/backup/vg_data /dev/sdb

# 恢复 VG

$ vgcfgrestore vg_data

# 激活

$ vgchange -ay vg_data

八、LV 误删的恢复

LV 删除后理论上无法恢复,但:

8.1 立刻做(关键!)

# 1. 立刻停掉所有可能写入的进程
$ umount /mnt/lv_demo

# 2. 不要做 fsck,不要做 resize


# 3. 不要对底层 PV 做任何操作

8.2 看 metadata 备份

$ ls /etc/lvm/archive/vg_data_*.vg

找到删除前的版本。

8.3 恢复 VG metadata

# 用备份恢复 VG
$ vgcfgrestore -f /etc/lvm/archive/vg_data_00005-1234567.vg vg_data

# 检查 LV 是否回来

$ lvs vg_data

8.4 文件系统层修复

LV 回来了,但文件系统可能不一致:

# ext4
$ e2fsck -f /dev/vg_data/lv_demo

# xfs

$ xfs_repair /dev/vg_data/lv_demo

8.5 实在恢复不了怎么办

  • • 从备份恢复(这是为什么备份重要)
  • • 用 testdisk / photorec 尝试扫描底层 block
  • • 找专业数据恢复公司

九、生产环境故障应急清单

把这份清单打印出来贴墙上:

□ 立刻:停止写入,umount 所有相关 LV
□ 不要:立刻重做 LVM 操作、立刻 fsck
□ 收集:dmesg、pvs、vgs、lvs -a、pvdisplay、lvdisplay
□ 备份:cp /etc/lvm/backup/* /safe/path/
□ 检查:metadata 历史 (ls /etc/lvm/archive/)
□ 恢复:vgcfgrestore
□ 验证:e2fsck / xfs_repair
□ 挂载:mount
□ 通知:相关业务方恢复情况

十、预防胜于救援

# 1. 每天备份 metadata 到安全位置
$ crontab -e
0 3 * * * cp -a /etc/lvm/backup/* /backup/lvm-metadata/

# 2. 监控 metadata 序列号变化

$ vgs -o vg_name,vg_mda_count,vg_seqno

# 3. 启用 lvmetad 自动缓存(性能更好)

$ lvmconf | grep use_lvmetad
use_lvmetad=1

# 4. 启用 lvm2-monitor 服务(自动检测)

$ systemctl enable lvm2-monitor
$ systemctl start lvm2-monitor

十一、本篇小结

LVM 排错的核心思路

  1. 1. 不要慌,先收集信息(pvs/vgs/lvs -a/dmesg
  2. 2. 不要立刻操作,先备份当前状态
  3. 3. 用 /etc/lvm/backup/ 和 /etc/lvm/archive/ 恢复
  4. 4. vgcfgrestore 是救命稻草

三大日常预防措施

  1. 1. 定期备份 metadata
  2. 2. 启用 lvm2-monitor 服务
  3. 3. 监控 SMART 提前换盘

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  1. CONNECT:[ UseTime:0.000428s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000631s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002244s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000269s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000636s ]
  6. SELECT * FROM `set` [ RunTime:0.000233s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000702s ]
  8. SELECT * FROM `article` WHERE `id` = 505365 LIMIT 1 [ RunTime:0.000514s ]
  9. UPDATE `article` SET `lasttime` = 1787313011 WHERE `id` = 505365 [ RunTime:0.008772s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000235s ]
  11. SELECT * FROM `article` WHERE `id` < 505365 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000883s ]
  12. SELECT * FROM `article` WHERE `id` > 505365 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007249s ]
  13. SELECT * FROM `article` WHERE `id` < 505365 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007689s ]
  14. SELECT * FROM `article` WHERE `id` < 505365 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003031s ]
  15. SELECT * FROM `article` WHERE `id` < 505365 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001051s ]
0.101058s