일단 아래 기록들을 참조했다.

9장. LVM 장치 가시성 및 사용 제한 Red Hat Enterprise Linux 9 | Red Hat Customer Portal
Access Red Hat’s knowledge, guidance, and support through your subscription.
https://access.redhat.com/documentation/ko-kr/red_hat_enterprise_linux/9/html/configuring_and_managing_logical_volumes/limiting-lvm-device-visibility-and-usage_configuring-and-managing-logical-volumes
Nutanix Support & Insights
https://portal.nutanix.com/page/documents/kbs/details?targetId=kA07V000000LaGrSAK
My virtual machine running RHEL 9 enters emergency mode. What can I do? - Synology Knowledge Center
Synology Knowledge Center offers comprehensive support, providing answers to frequently asked questions, troubleshooting steps, software tutorials, and all the technical documentation you may need.
https://kb.synology.com/en-sg/DSM/tutorial/My_virtual_machine_running_RHEL_9_enters_emergency_mode

dd 명령어를 이용해서 LVM으로 구성된 RHEL9 시스템을 마이그레이션 했다.

[root@fedora live]# dd if=/dev/sda of=/dev/sdb bs=512k

LVM을 제대로 인식 못해서 rhel 볼륨그룹을 제대로 인식 못해서 rhel/data와 rhel/log를 인식할 수 없는 상황이었다.

[root@vm-main lana]# pvdisplay
  Devices file sys_wwid naa.500080d910085af1 PVID fLsA6Mr8zZJesnTpfF83jVy4FELdhvrt last seen on /dev/sdb3 not found.

[root@vm-main lana]# vgdisplay
  Devices file sys_wwid naa.500080d910085af1 PVID fLsA6Mr8zZJesnTpfF83jVy4FELdhvrt last seen on /dev/sdb3 not found.
   
[root@vm-main lana]# lvdisplay
  Devices file sys_wwid naa.500080d910085af1 PVID fLsA6Mr8zZJesnTpfF83jVy4FELdhvrt last seen on /dev/sdb3 not found.

[root@vm-main lana]#

이렇게 나올땐 일단 /etc/lvm/devices/system.devices 를 점검해본다.

[root@vm-main lana]# cat /etc/lvm/devices/system.devices
# LVM uses devices listed in this file.
# Created by LVM command vgscan pid 1270 at Tue Mar  7 03:04:10 2023
VERSION=1.1.18
IDTYPE=sys_wwid IDNAME=naa.500080d910085af1 DEVNAME=/dev/sdb3 PVID=fLsA6Mr8zZJesnTpfF83jVy4FELdhvrt PART=3

저 PVID 장치명을 제대로 못찾는다. 치워버리자.

[root@vm-main lana]# cat /etc/lvm/devices/system.devices
# LVM uses devices listed in this file.
# Created by LVM command vgscan pid 1270 at Tue Mar  7 03:04:10 2023
VERSION=1.1.18
IDTYPE=sys_wwid IDNAME=naa.500080d910085af1 DEVNAME=/dev/sdb3 PVID=fLsA6Mr8zZJesnTpfF83jVy4FELdhvrt PART=3
[root@vm-main lana]# mv /etc/lvm/devices/system.devices system.backup
[root@vm-main lana]# ll
total 4
-rw------- 1 root root 445 Mar  7 03:09 system.backup

그리고 vgimportdevices 명령어를 이용해서 장치를 다시 가져온다

[root@vm-main lana]# vgimportdevices -a
  Added 1 devices to devices file.
[root@vm-main lana]# cat /etc/lvm/devices/system.devices
# LVM uses devices listed in this file.
# Created by LVM command vgimportdevices pid 4512 at Tue Mar  7 03:17:51 2023
VERSION=1.1.1
IDTYPE=sys_wwid IDNAME=naa.538f60161045f640 DEVNAME=/dev/sdb3 PVID=fLsA6Mr8zZJesnTpfF83jVy4FELdhvrt PART=3

vgimportdevices -a로 모든 장치 파일을 다시 만들수도 있고 vgimport /dev/mapper/<VG>로 특정 장치파일만 다시 가져올 수 있다.

만약 저 파일에서 문제되는 부분을 주석처리하지 않는다면 중복된 부분이 있는데 그래도 진행할거냐고 물어본다.

어쨌든 

[root@vm-main lana]# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sdb3
  VG Name               rhel
  PV Size               <117.66 GiB / not usable 3.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              30119
  Free PE               0
  Allocated PE          30119
  PV UUID               fLsA6M-r8zZ-Jesn-TpfF-83jV-y4FE-Ldhvrt
   
[root@vm-main lana]# vgdisplay
  --- Volume group ---
  VG Name               rhel
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  10
  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               117.65 GiB
  PE Size               4.00 MiB
  Total PE              30119
  Alloc PE / Size       30119 / 117.65 GiB
  Free  PE / Size       0 / 0   
  VG UUID               REZGOO-tqms-8rN7-1Qjo-lB0o-m3GQ-QdI7x9
   
[root@vm-main lana]# lvdisplay
  --- Logical volume ---
  LV Path                /dev/rhel/root
  LV Name                root
  VG Name                rhel
  LV UUID                sP2Q0l-9EeX-JXoz-oK6x-2MFB-sAVI-Uk4Nfv
  LV Write Access        read/write
  LV Creation host, time VM-Main.weing.asdf, 2023-03-01 13:46:31 +0900
  LV Status              available
  # open                 1
  LV Size                32.00 GiB
  Current LE             8192
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0
   
  --- Logical volume ---
  LV Path                /dev/rhel/data
  LV Name                data
  VG Name                rhel
  LV UUID                0eeNc3-0fJX-rGEn-7Gng-PdvG-03jM-eDzggy
  LV Write Access        read/write
  LV Creation host, time VM-Main.weing.asdf, 2023-03-01 13:46:32 +0900
  LV Status              NOT available
  LV Size                <73.80 GiB
  Current LE             18892
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
   
  --- Logical volume ---
  LV Path                /dev/rhel/swap
  LV Name                swap
  VG Name                rhel
  LV UUID                QA4sm0-qG8H-1SLp-eunf-GhtD-iROf-y12FwM
  LV Write Access        read/write
  LV Creation host, time VM-Main.weing.asdf, 2023-03-01 13:46:34 +0900
  LV Status              available
  # open                 2
  LV Size                <7.86 GiB
  Current LE             2011
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1
   
  --- Logical volume ---
  LV Path                /dev/rhel/log
  LV Name                log
  VG Name                rhel
  LV UUID                wlMtW1-nctl-W8sn-Jwed-bB95-wsQD-r2l0X3
  LV Write Access        read/write
  LV Creation host, time VM-Main.weing.asdf, 2023-03-01 13:46:34 +0900
  LV Status              NOT available
  LV Size                4.00 GiB
  Current LE             1024
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
   
[root@vm-main lana]#

이제 fstab에서 비활성화했던 파티션을 다시 활성화하고 마운트하면 된다.

이런 일이 일어난 이유로, RHEL 9.0부터는 use_devicesfile 옵션이 기본적으로 활성화되어서 그렇다.

4.11. 파일 시스템 및 스토리지 Red Hat Enterprise Linux 9 | Red Hat Customer Portal
Access Red Hat’s knowledge, guidance, and support through your subscription.
https://access.redhat.com/documentation/ko-kr/red_hat_enterprise_linux/9/html/9.0_release_notes/enhancement_file-systems-and-storage

RHEL 9.0 스토리지 주요 변경 사항에 있는 내용인데, RHEL 9부터는 LVM이 사용하기로 지정한 장치만 인식한다. 그 외의 장치들은 무시한다.


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