> Am 15.05.2025 um 15:27 schrieb Robert McBroom via users <users@xxxxxxxxxxxxxxxxxxxxxxx>:
>
> Have a Fc39 server qemu/kvm virtual machine. Trying to access the filesystem from the host machine. The following commands---
> :~# modprobe nbd max_part=8
> :~# qemu-nbd --connect=/dev/nbd0 /var/lib/libvirt/images/Fed39.qcow2
>
> :~# fdisk /dev/nbd0 -l
> Disk /dev/nbd0: 60 GiB, 64424509440 bytes, 125829120 sectors
> Units: sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 131072 bytes
> Disklabel type: gpt
> Disk identifier: 3B52A5A1-29BD-436B-8145-EEF27D9EFC97
>
> Device Start End Sectors Size Type
> /dev/nbd0p1 2048 4095 2048 1M BIOS boot
> /dev/nbd0p2 4096 2101247 2097152 1G Linux filesystem
> /dev/nbd0p3 2101248 125827071 123725824 59G Linux LVM
> :~# mount /dev/nbd0p3 /mnt/iso
> mount: /mnt/iso: unknown filesystem type 'LVM2_member'.
> dmesg(1) may have more information after failed mount system call.
>
> :~# vgscan
> Found volume group "fedora_hpz440" using metadata type lvm2
> WARNING: Couldn't find device with uuid IrbzRo-h3Fw-7s0X-3x1q-NONl-TE3b-iUeftd.
> WARNING: VG sysvg is missing PV IrbzRo-h3Fw-7s0X-3x1q-NONl-TE3b-iUeftd (last written to /dev/sdb).
> Found volume group "sysvg" using metadata type lvm2
>
> The missing PV in sysvg is a separate qcow2 file. Just need access to the first. Is there a way to access the group from the host?
> —
With F39 / F40 there was a (unfortunately unannounced) change in the LVM device management.
You may have to add to the vgscan command a parameter
vgscan —-devices /dev/nbd0p3,/dev/{your_second_disk}
See https://docs.stg.fedoraproject.org/en-US/fedora-server/administration/lvm-management-cheatsheet/
Same with all the other vg… commands, specifically vgchange
Alternatively, libguestfs might be able to recognize the additional volume better.
--
Peter Boy
https://fedoraproject.org/wiki/User:Pboy
PBoy@xxxxxxxxxxxxxxxxx
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