# Rocky 9 install : existing logical volumes are not visible **URL:** \ **Category:** Rocky Linux Help & Support\ **Created:** [September 14, 2022, 2:47pm UTC](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239 "2022-09-14T14:47:46Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![BGO](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/bgo/32/2275_2.png) [@BGO](https://forums.rockylinux.org/u/BGO)\ **Post date:** [September 14, 2022, 2:47pm UTC](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239/1 "2022-09-14T14:47:47Z")
On my home server I have a disk for the os and home folders, and a (software) raid 5 array build up out of 4 disks of 6TB with several logical volumes on the array. After the os installation, the array is visible (/dev/md0 is present) but none of the lv is visible any more. I know when I switched from Centos 7 to Centos 8 (and migrated to Rocky 8), all volumes were present after the os installation. If I do a fdisk of /dev/md0 this is what I get : The device contains ‘LVM2\_member’ signature … No partitions are visible (same using gdisk). Anyone has any idea on how to get the lv’s back? ---
**Author:** ![iwalker](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/iwalker/32/2599_2.png) [@iwalker](https://forums.rockylinux.org/u/iwalker)\ **Post date:** [September 14, 2022, 3:34pm UTC](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239/2 "2022-09-14T15:34:19Z")
Usually if you install a new system, and LVM’s exist, then the easiest way is to activate them, so: ```auto vgchange -ay ``` should activate all possible available LVM groups, etc. After this the normal `vgs` and `lvs` commands should show your volume groups and volumes. ---
**Author:** ![BGO](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/bgo/32/2275_2.png) [@BGO](https://forums.rockylinux.org/u/BGO)\ **Post date:** [September 14, 2022, 4:50pm UTC](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239/3 "2022-09-14T16:50:43Z")
Thanks, I’ve tried it, but no result. ---
**Author:** ![iwalker](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/iwalker/32/2599_2.png) [@iwalker](https://forums.rockylinux.org/u/iwalker)\ **Post date:** [September 14, 2022, 5:09pm UTC](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239/4 "2022-09-14T17:09:40Z")
Can you post the output for the following commands: ```auto pvscan vgscan lvscan ``` we will need to diagnose and debug this, so copy and paste the results from the console (please do not post a screenshots, it’s horrible and difficult to read). ---
**Author:** ![gerry666uk](https://avatars.discourse-cdn.com/v4/letter/g/dbc845/32.png) [@gerry666uk](https://forums.rockylinux.org/u/gerry666uk)\ **Post date:** [September 14, 2022, 6:37pm UTC](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239/5 "2022-09-14T18:37:35Z")
> [@BGO](#): > > when I switched from Centos 7 to Centos 8 (and migrated to Rocky 8), all volumes were present after the os installation So you’re saying you migrated form Centos 7 to Centos 8 and then to Rocky 8 and “all volumes were present”, so at what point did they disappear?? ---
**Author:** ![BGO](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/bgo/32/2275_2.png) [@BGO](https://forums.rockylinux.org/u/BGO)\ **Post date:** [September 15, 2022, 6:44am UTC](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239/6 "2022-09-15T06:44:06Z")
The raid array and logical volumes were created on Centos 7. Later I installed Centos 8 and it just recognized the existing array and volumes. Switched to Rocky 8 using the migration scripts. All was working as exepected. Now I installed Rocky 9, and I see the array, but no more logical volumes (or volume groups). I was expecting that after the fresh installation of Rocky 9 I would be able to mount the volumes. During installation, the disks in the array were not touched. ---
**Author:** ![jlehtone](https://avatars.discourse-cdn.com/v4/letter/j/e9a140/32.png) [@jlehtone](https://forums.rockylinux.org/u/jlehtone)\ **Post date:** [September 15, 2022, 7:24am UTC](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239/7 "2022-09-15T07:24:47Z")
Hypothesis: RL9 does assemble raid array correctly but does not scan it for LVM content. Question: What can we manually see? > [@iwalker](#): > > Can you post the output for the following commands: > > ```plaintext > pvscan > vgscan > lvscan > > ``` ---
**Author:** ![BGO](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/bgo/32/2275_2.png) [@BGO](https://forums.rockylinux.org/u/BGO)\ **Post date:** [September 15, 2022, 4:34pm UTC](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239/8 "2022-09-15T16:34:13Z")
This is the output : $ pvscan PV /dev/sda2 VG rl lvm2 [\<110.79 GiB / 0 free] Total: 1 [\<110.79 GiB] / in use: 1 [\<110.79 GiB] / in no VG: 0 [0] $ vgscan Found volume group “rl” using metadata type lvm2 $ lvscan ACTIVE ‘/dev/rl/swap’ [7.35 GiB] inherit ACTIVE ‘/dev/rl/home’ [33.93 GiB] inherit ACTIVE ‘/dev/rl/root’ [69.50 GiB] inherit Output only shows entries regarding sda device, nothing related to the other devices (raid array). ---
**Author:** ![iwalker](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/iwalker/32/2599_2.png) [@iwalker](https://forums.rockylinux.org/u/iwalker)\ **Post date:** [September 15, 2022, 4:48pm UTC](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239/9 "2022-09-15T16:48:25Z")
Also please: ```auto cat /proc/mdstat ``` and: ```auto mdadm --detail --scan ``` ```auto mdadm --detail /dev/md0 ``` ---
**Author:** ![BGO](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/bgo/32/2275_2.png) [@BGO](https://forums.rockylinux.org/u/BGO)\ **Post date:** [September 15, 2022, 7:27pm UTC](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239/10 "2022-09-15T19:27:11Z")
$ cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] md0 : active raid5 sde1[4] sdb1[0] sdc1[1] sdd[5] 17581166592 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/4] [UUUU] bitmap: 0/44 pages [0KB], 65536KB chunk unused devices: $ mdadm --detail --scan ARRAY /dev/md/0 metadata=1.2 name=faulhorn:0 UUID=10373e04:bf6b0e0c:544f5700:689d16f4 $ mdadm --detail /dev/md0 /dev/md0: Version : 1.2 Creation Time : Sat Dec 29 19:56:29 2018 Raid Level : raid5 Array Size : 17581166592 (16.37 TiB 18.00 TB) Used Dev Size : 5860388864 (5.46 TiB 6.00 TB) Raid Devices : 4 Total Devices : 4 Persistence : Superblock is persistent ``` Intent Bitmap : Internal Update Time : Wed Sep 14 13:07:04 2022 State : clean Active Devices : 4 ``` Working Devices : 4 Failed Devices : 0 Spare Devices : 0 ``` Layout : left-symmetric Chunk Size : 512K ``` Consistency Policy : bitmap ``` Name : faulhorn:0 (local to host faulhorn) UUID : 10373e04:bf6b0e0c:544f5700:689d16f4 Events : 83351 Number Major Minor RaidDevice State 0 8 17 0 active sync /dev/sdb1 1 8 33 1 active sync /dev/sdc1 5 8 48 2 active sync /dev/sdd 4 8 65 3 active sync /dev/sde1 ``` ---
**Author:** ![iwalker](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/iwalker/32/2599_2.png) [@iwalker](https://forums.rockylinux.org/u/iwalker)\ **Post date:** [September 15, 2022, 8:21pm UTC](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239/11 "2022-09-15T20:21:59Z")
Well, I’m out of ideas of what to suggest, so I’m going to try and replicate this on my setup. So far I’ve done this on Rocky 8, and then I’ll disconnect the disks from the machine, and add to Rocky 9. First, I’ve created the array, just with 3 x 20gb disks to keep it quick. ```auto [root@rocky8 ~]# cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] md0 : active raid5 vdd[3] vdc[1] vdb[0] 41908224 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] [UUU] unused devices: ``` Then set up my LVM groups/volumes: ```auto [root@rocky8 ~]# pvs PV VG Fmt Attr PSize PFree /dev/md0 rocky-test lvm2 a-- 39.96g 0 [root@rocky8 ~]# vgs VG #PV #LV #SN Attr VSize VFree rocky-test 1 1 0 wz--n- 39.96g 0 [root@rocky8 ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lv-test rocky-test -wi-a----- 39.96g ``` Mounted it and put some data in it just for proof-of-concept: ```auto [root@rocky8 raid]# mount | grep raid /dev/mapper/rocky--test-lv--test on /mnt/raid type xfs (rw,relatime,seclabel,attr2,inode64,logbufs=8,logbsize=32k,sunit=1024,swidth=2048,noquota) [root@rocky8 raid]# ls -lha /mnt/raid/ total 1000M drwxr-xr-x. 2 root root 22 Sep 15 21:52 . drwxr-xr-x. 3 root root 18 Sep 15 21:51 .. -rw-r--r--. 1 root root 1000M Sep 15 21:52 test.img ``` Deactivating the LVM volumes and stopping the array, and verifying with the LVM commands: ```auto [root@rocky8 ~]# vgchange -an rocky-test 0 logical volume(s) in volume group "rocky-test" now active [root@rocky8 ~]# mdadm --stop /dev/md0 mdadm: stopped /dev/md0 [root@rocky8 ~]# vgs [root@rocky8 ~]# lvs [root@rocky8 ~]# pvs ``` So, now I connected to the Rocky 9 machine all those disks, and installed mdadm, and lvm2: ```auto [root@rocky9 ~]# mdadm --assemble /dev/md0 /dev/vdb /dev/vdc /dev/vdd mdadm: /dev/md0 has been started with 3 drives. [root@rocky9 ~]# cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] md0 : active raid5 vdb[0] vdd[3] vdc[1] 41908224 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] [UUU] unused devices: ``` so, now we have md0 active. ```auto [root@rocky9 ~]# pvs PV VG Fmt Attr PSize PFree /dev/md0 rocky-test lvm2 a-- 39.96g 0 [root@rocky9 ~]# vgs VG #PV #LV #SN Attr VSize VFree rocky-test 1 1 0 wz--n- 39.96g 0 [root@rocky9 ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lv-test rocky-test -wi------- 39.96g ``` so on my Rocky 9 it has detected them perfectly fine. I would suggest you do something like: ```auto mdadm --stop /dev/md0 ``` and then do the assemble command similar to mine, but for yours it would be: ```auto mdadm --assemble /dev/md0 /dev/sdb1 /dev/sdc1 /dev/sdd /dev/sde1 ``` and then after that, see if you can see the LVM stuff using pvs, pvscan, vgs, vgscan, lvs, lvscan. You can also try, if you know exactly what the volume group is called to do: ```auto [root@rocky9 ~]# vgchange -ay rocky-test 1 logical volume(s) in volume group "rocky-test" now active ``` I’ve used my volume group as an example. And for data verification: ```auto [root@rocky9 ~]# mkdir /mnt/raid [root@rocky9 ~]# mount /dev/rocky-test/lv-test /mnt/raid [root@rocky9 ~]# ls -lha /mnt/raid/ total 1000M drwxr-xr-x. 2 root root 22 Sep 15 21:52 . drwxr-xr-x. 3 root root 18 Sep 15 22:22 .. -rw-r--r--. 1 root root 1000M Sep 15 21:52 test.img ``` shows that all is intact. There is every possibility though that even after this if it does not show it then it would seem the LVM is somehow damaged perhaps the metadata it is the only thing I can think of if it still does not work. ---
**Author:** ![BGO](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/bgo/32/2275_2.png) [@BGO](https://forums.rockylinux.org/u/BGO)\ **Post date:** [September 16, 2022, 5:56am UTC](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239/12 "2022-09-16T05:56:46Z")
Thanks for your help. I’ve tried it, but it didn’t work. What I do see is this : $ pvdisplay /dev/md0 Cannot use /dev/md0: device is not in devices file ---
**Author:** ![iwalker](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/iwalker/32/2599_2.png) [@iwalker](https://forums.rockylinux.org/u/iwalker)\ **Post date:** [September 16, 2022, 5:59am UTC](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239/13 "2022-09-16T05:59:04Z")
Try some of the commands listed here, it goes into troubleshooting LVM, maybe even with failed devices: [Chapter 17. Troubleshooting LVM Red Hat Enterprise Linux 8 | Red Hat Customer Portal](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/configuring_and_managing_logical_volumes/troubleshooting-lvm_configuring-and-managing-logical-volumes) I wouldn’t particular look at the removing LVM stuff of restoring metadata at this point in time. But the failed commands might help list what you have on that device. As I said, assuming that it’s not irrepairably damaged. The section on LVM Raid also isn’t to be used, since your raid is on mdadm and not via LVM. ---
**Author:** ![jlehtone](https://avatars.discourse-cdn.com/v4/letter/j/e9a140/32.png) [@jlehtone](https://forums.rockylinux.org/u/jlehtone)\ **Post date:** [September 16, 2022, 8:13am UTC](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239/14 "2022-09-16T08:13:03Z")
> [@BGO](#): > > device is not in devices file Websearch with `lvm "device is not in devices file"` does not find much, but there seems to be “lvmdevices(8)”: [main - device usage based on devices file - lvm2-commits - Fedora Mailing-Lists](https://lists.fedoraproject.org/archives/list/lvm2-commits@lists.fedorahosted.org/thread/P2OVJR3SJXJSDVOXMOGPISCPE77DJ4KB/) The default seems to be to not use such file: ```auto $ grep use_devicesfile /etc/lvm/lvm.conf # Configuration option devices/use_devicesfile. # use_devicesfile = 0 ``` Even though file seems to be created on installation: ```auto $ cat /etc/lvm/devices/system.devices # LVM uses devices listed in this file. # Created by LVM command lvmdevices pid 3281 at Fri Jul 22 12:26:01 2022 VERSION=1.1.1 IDTYPE=devname IDNAME=/dev/sda1 DEVNAME=/dev/sda1 PVID=3y..YN PART=1 ``` Another hit describes how CentOS Stream 9 had issue with LV on MD: [https://bugzilla.redhat.com/show\_bug.cgi?id=2002640](https://bugzilla.redhat.com/show_bug.cgi?id=2002640) Alas, that (on brief glance) had different symptoms. ---
**Author:** ![BGO](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/bgo/32/2275_2.png) [@BGO](https://forums.rockylinux.org/u/BGO)\ **Post date:** [September 16, 2022, 8:20am UTC](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239/15 "2022-09-16T08:20:21Z")
Tried a lot, nothing seems to work. Restored the Rocky 8 installation, array is healthy, data on the volumes is accessible. I had a recent backup of the data, so there was no stress on losing data. Think I will make a new backup and then have a new go at it. Would vgexport/vgimport would be an option? ---
**Author:** ![felfert](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/felfert/32/2259_2.png) [@felfert](https://forums.rockylinux.org/u/felfert)\ **Post date:** [September 16, 2022, 8:46am UTC](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239/16 "2022-09-16T08:46:02Z")
Whhops, I’m to late. Just had some ideas: Maybe the RAID is not named /dev/md0 I had something like this earlier on various Linux-Distros. So if you run into the same, probably run lsblk to see wether it is perhaps named differently. Also, (as far as I remember) you might try to add the raid’s UUID to the kernel cmdline explicitely like `rd.md.uuid=` Note: The raid “UUID” has a different (unusual) format of 4 hex numbers separated by colon. You would get the raid uuid before upgrading on rocky8 using the following cmd: `mdadm --detail /dev/mdX | grep UUID` (replace **X** by the actual device number) Oh, and I forgot to add: Unless the underlying raid is detected (which should be shown with lsblk), any LVM-related actions are useless. ---
**Author:** ![iwalker](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/iwalker/32/2599_2.png) [@iwalker](https://forums.rockylinux.org/u/iwalker)\ **Post date:** [September 16, 2022, 9:15am UTC](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239/17 "2022-09-16T09:15:51Z")
@felfert in this post: [Rocky 9 install : existing logical volumes are not visible - #10 by BGO](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239/10) it’s confirmed as md0. The mdadm detail shows that in that post 🙂 ---
**Author:** ![felfert](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/felfert/32/2259_2.png) [@felfert](https://forums.rockylinux.org/u/felfert)\ **Post date:** [September 16, 2022, 9:25am UTC](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239/18 "2022-09-16T09:25:13Z")
I stand corrected, have somehow overlooked that. ---
**Author:** ![BGO](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/bgo/32/2275_2.png) [@BGO](https://forums.rockylinux.org/u/BGO)\ **Post date:** [September 16, 2022, 12:24pm UTC](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239/19 "2022-09-16T12:24:04Z")
Did a fresh Rocky 8.6 install : $ pvscan PV /dev/sda2 VG rl lvm2 [110.79 GiB / 0 free] PV /dev/md0 VG vg-datastore lvm2 [16.37 TiB / 4.66 TiB free] Total: 2 [16.48 TiB] / in use: 2 [16.48 TiB] / in no VG: 0 [0] $ vgscan Found volume group “rl” using metadata type lvm2 Found volume group “vg-datastore” using metadata type lvm2 All volumes are also visible and mountable. Going to try a Rocky 9 again. ---
**Author:** ![BGO](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/bgo/32/2275_2.png) [@BGO](https://forums.rockylinux.org/u/BGO)\ **Post date:** [September 16, 2022, 2:02pm UTC](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239/20 "2022-09-16T14:02:10Z")
Did a fresh Rocky 9 installation, result was the same as after the previous 9 install, no volumes on the array visible (but the array was active). The remark of @jlehtone triggered me and this did the trick : $ lvmdevices --adddev /dev/md0 $ vgchange -ay vg-datastore After this, the volumes became visible ant mountable! Is this what we can expect after a fresh install, or should the volumes be ready like after the Rocky 8 installation? [Next page](https://forums.rockylinux.org/t/rocky-9-install-existing-logical-volumes-are-not-visible/7239.md?page=2)