Centos6操作系统之消失的LVM

Centos6操作系统之消失的LVM

𝓓𝓸𝓷 Lv6
  2026-01-20 16:19:25 2026-01-20 16:19:25 Created   2026-01-20 16:20:09 2026-01-20 16:20:09 Updated    

https://docs.redhat.com/zh-cn/documentation/red_hat_enterprise_linux/7/html/logical_volume_manager_administration/cluster_activation

Centos6版本多路径与LVM同时使用时，会出现重启服务器后，逻辑卷消失问题，具体表现为reboot服务器后/dev/mapper/下的LV(vg_vocr-ocr1)没有了，Centos7版本没有这样的问题。

一、现象

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[root@gdyfdb01 ~]# ll /dev/mapper/
total 0
crw-rw---- 1 root root 10, 58 Jan 20 12:41 control
lrwxrwxrwx 1 root root      7 Jan 20 12:41 vg_gdyfdb01-LogVol00 -> ../dm-1
lrwxrwxrwx 1 root root      7 Jan 20 12:41 vg_gdyfdb01-LogVol01 -> ../dm-0
lrwxrwxrwx 1 root root      7 Jan 20 12:41 vg_vocr-ocr1 -> ../dm-3
lrwxrwxrwx 1 root root      7 Jan 20 12:41 vocr -> ../dm-2

[root@gdyfdb01 ~]# sync

[root@gdyfdb01 ~]# reboot

[root@gdyfdb01 ~]# fdisk -l

Disk /dev/sda: 53.7 GB, 53687091200 bytes
64 heads, 32 sectors/track, 51200 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000d1a06

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           2         301      307200   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2             302       51200    52120576   8e  Linux LVM
Partition 2 does not end on cylinder boundary.

Disk /dev/mapper/vg_gdyfdb01-LogVol01: 44.8 GB, 44778389504 bytes
255 heads, 63 sectors/track, 5443 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000


Disk /dev/mapper/vg_gdyfdb01-LogVol00: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000


Disk /dev/sdb: 6442 MB, 6442516480 bytes
199 heads, 62 sectors/track, 1019 cylinders
Units = cylinders of 12338 * 512 = 6317056 bytes
Sector size (logical/physical): 512 bytes / 65536 bytes
I/O size (minimum/optimal): 65536 bytes / 65536 bytes
Disk identifier: 0x00000000


Disk /dev/sdc: 6442 MB, 6442516480 bytes
199 heads, 62 sectors/track, 1019 cylinders
Units = cylinders of 12338 * 512 = 6317056 bytes
Sector size (logical/physical): 512 bytes / 65536 bytes
I/O size (minimum/optimal): 65536 bytes / 65536 bytes
Disk identifier: 0x00000000


Disk /dev/mapper/vocr: 6442 MB, 6442516480 bytes
255 heads, 63 sectors/track, 783 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 65536 bytes
I/O size (minimum/optimal): 65536 bytes / 65536 bytes
Disk identifier: 0x00000000


Disk /dev/mapper/vg_vocr-ocr1: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 65536 bytes
I/O size (minimum/optimal): 65536 bytes / 65536 bytes
Disk identifier: 0x00000000


[root@gdyfdb01 ~]# multipath -ll
vocr (36589cfc000000449ab518525193bae47) dm-2 TrueNAS,iSCSI Disk
size=6.0G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=1 status=active
| `- 33:0:0:0 sdb 8:16 active ready running
`-+- policy='round-robin 0' prio=1 status=enabled
  `- 34:0:0:0 sdc 8:32 active ready running
[root@gdyfdb01 ~]# 
[root@gdyfdb01 ~]# more /etc/multipath.conf 
## Use user friendly names, instead of using WWIDs as names.
defaults {
        user_friendly_names yes
}
blacklist {
        devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
        devnode "^(hd|xvd|vd)[a-z]*"
#        wwid "*"
}

multipaths {
        multipath {
                wwid                    36589cfc000000449ab518525193bae47
                alias                   vocr
        }
}

[root@gdyfdb01 ~]# ll /dev/mapper/
total 0
crw-rw---- 1 root root 10, 58 Jan 20 12:41 control
lrwxrwxrwx 1 root root      7 Jan 20 12:41 vg_gdyfdb01-LogVol00 -> ../dm-1
lrwxrwxrwx 1 root root      7 Jan 20 12:41 vg_gdyfdb01-LogVol01 -> ../dm-0

此处逻辑卷vg_vocr-ocr1 -> ../dm-3 丢失了。

二、原因

原因未知

三、解决方法

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(1) 手工激活卷组
[root@gdyfdb01 ~]# ll /dev/mapper/
total 0
crw-rw---- 1 root root 10, 58 Jan 20 12:34 control
lrwxrwxrwx 1 root root      7 Jan 20 12:34 vg_gdyfdb01-LogVol00 -> ../dm-1
lrwxrwxrwx 1 root root      7 Jan 20 12:34 vg_gdyfdb01-LogVol01 -> ../dm-0
lrwxrwxrwx 1 root root      7 Jan 20 12:34 vocr -> ../dm-2

[root@gdyfdb01 ~]# lvscan 
  inactive          '/dev/vg_vocr/ocr1' [1.00 GiB] inherit
  ACTIVE            '/dev/vg_gdyfdb01/LogVol01' [41.70 GiB] inherit
  ACTIVE            '/dev/vg_gdyfdb01/LogVol00' [8.00 GiB] inherit

[root@gdyfdb01 ~]# lvdisplay /dev/vg_vocr/ocr1
  --- Logical volume ---
  LV Path                /dev/vg_vocr/ocr1
  LV Name                ocr1
  VG Name                vg_vocr
  LV UUID                3h8Bmb-46Uf-M1r4-6M00-RcR3-iilw-UejiyH
  LV Write Access        read/write
  LV Creation host, time gdyfdb01, 2026-01-20 12:23:53 +0800
  LV Status              NOT available
  LV Size                1.00 GiB
  Current LE             256
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  
 检查发现逻辑卷状态NOT available
 
[root@gdyfdb01 ~]# lsblk
NAME                            MAJ:MIN RM  SIZE RO TYPE  MOUNTPOINT
sr0                              11:0    1  3.7G  0 rom   
sda                               8:0    0   50G  0 disk  
├─sda1                            8:1    0  300M  0 part  /boot
└─sda2                            8:2    0 49.7G  0 part  
  ├─vg_gdyfdb01-LogVol01 (dm-0) 253:0    0 41.7G  0 lvm   /
  └─vg_gdyfdb01-LogVol00 (dm-1) 253:1    0    8G  0 lvm   [SWAP]
sdb                               8:16   0    6G  0 disk  
└─vocr (dm-2)                   253:2    0    6G  0 mpath 
sdc                               8:32   0    6G  0 disk  
└─vocr (dm-2)                   253:2    0    6G  0 mpath 

[root@gdyfdb01 ~]# vgchange -a y vg_vocr
  1 logical volume(s) in volume group "vg_vocr" now active
  
[root@gdyfdb01 ~]# ll /dev/mapper/
total 0
crw-rw---- 1 root root 10, 58 Jan 20 12:34 control
lrwxrwxrwx 1 root root      7 Jan 20 12:34 vg_gdyfdb01-LogVol00 -> ../dm-1
lrwxrwxrwx 1 root root      7 Jan 20 12:34 vg_gdyfdb01-LogVol01 -> ../dm-0
lrwxrwxrwx 1 root root      7 Jan 20 12:35 vg_vocr-ocr1 -> ../dm-3
lrwxrwxrwx 1 root root      7 Jan 20 12:34 vocr -> ../dm-2

[root@gdyfdb01 ~]# lvdisplay 
  --- Logical volume ---
  LV Path                /dev/vg_vocr/ocr1
  LV Name                ocr1
  VG Name                vg_vocr
  LV UUID                3h8Bmb-46Uf-M1r4-6M00-RcR3-iilw-UejiyH
  LV Write Access        read/write
  LV Creation host, time gdyfdb01, 2026-01-20 12:23:53 +0800
  LV Status              available
  # open                 0
  LV Size                1.00 GiB
  Current LE             256
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:3
   
  --- Logical volume ---
  LV Path                /dev/vg_gdyfdb01/LogVol01
  LV Name                LogVol01
  VG Name                vg_gdyfdb01
  LV UUID                qzuphP-ewbm-3X17-ald5-yHJf-594T-KVRhBs
  LV Write Access        read/write
  LV Creation host, time gdyfdb01, 2026-01-19 02:35:28 +0800
  LV Status              available
  # open                 1
  LV Size                41.70 GiB
  Current LE             10676
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0
   
  --- Logical volume ---
  LV Path                /dev/vg_gdyfdb01/LogVol00
  LV Name                LogVol00
  VG Name                vg_gdyfdb01
  LV UUID                f3NPq3-yTTk-kfYV-gqhL-AyFt-dciZ-6sJWDi
  LV Write Access        read/write
  LV Creation host, time gdyfdb01, 2026-01-19 02:35:33 +0800
  LV Status              available
  # open                 1
  LV Size                8.00 GiB
  Current LE             2048
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1
  
(2) 将激活卷组命令写进开机自动启动中
[root@gdyfdb01 ~]# vi /etc/rc.local 

vgchange -a y vg_vocr
  • Title: Centos6操作系统之消失的LVM
  • Author: 𝓓𝓸𝓷
  • Created at : 2026-01-20 16:19:25
  • Updated at : 2026-01-20 16:20:09
  • Link: https://www.zhangdong.me/centos-multipath-lvm.html
  • License: This work is licensed under CC BY-NC-SA 4.0.
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  1. 一、现象
  2. 二、原因
  3. 三、解决方法