I created a logical volume group for my xen VMs on a separate drive. I had them working perfectly. Then I accidentally unplugged the USB cable hosting my vg0. Now my VMs drives cannot be detected.
I can see them.
root@bradNewInspiron15:/etc/xen# lvdisplay -v /dev/vg0/lv-vm-debian01
File descriptor 58 (/run/user/1000/gnome-shell-disable-extensions (deleted)) leaked on lvdisplay invocation. Parent PID 4855: bash
File descriptor 84 (/home/brad/.local/share/gvfs-metadata/home (deleted)) leaked on lvdisplay invocation. Parent PID 4855: bash
File descriptor 85 (/home/brad/.local/share/gvfs-metadata/home-aa10c3e6.log (deleted)) leaked on lvdisplay invocation. Parent PID 4855: bash
File descriptor 87 (/home/brad/.local/share/gvfs-metadata/trash:) leaked on lvdisplay invocation. Parent PID 4855: bash
File descriptor 88 (/home/brad/.local/share/gvfs-metadata/trash:-7372c3e8.log) leaked on lvdisplay invocation. Parent PID 4855: bash
--- Logical volume ---
LV Path /dev/vg0/lv-vm-debian01
LV Name lv-vm-debian01
VG Name vg0
LV UUID loZ0jx-cdot-58kJ-QlaJ-4tdD-JpGO-581s8H
LV Write Access read/write
LV Creation host, time bradNewInspiron15, 2021-06-13 07:00:33 -0500
LV Status available
# open 0
LV Size 15.00 GiB
Current LE 3840
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:7
or all of them here:
root@bradNewInspiron15:/etc/xen# ls /dev/vg0
lv-vm-debian01 lv-vm-debian02 lv-vm-mint01 lv-vm-mint02 lv-vm-suse01 lv-vm-suse02 lv-vm-ubuntu01 lv-vm-ubuntu02
my VM drive is /dev/sdc
root@bradNewInspiron15:/etc/xen# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 9.1M 1 loop /snap/canonical-livepatch/98
loop1 7:1 0 16.9M 1 loop /snap/mcpelauncher-thesonicmaster/12
loop2 7:2 0 9.1M 1 loop /snap/canonical-livepatch/99
loop3 7:3 0 99.2M 1 loop /snap/core/11167
loop4 7:4 0 141.5M 1 loop /snap/chromium/1637
loop5 7:5 0 55.4M 1 loop /snap/core18/2066
loop7 7:7 0 77.2M 1 loop /snap/discord/128
loop8 7:8 0 219M 1 loop /snap/gnome-3-34-1804/72
loop9 7:9 0 260.7M 1 loop /snap/kde-frameworks-5-core18/32
loop10 7:10 0 32.1M 1 loop /snap/snapd/12057
loop11 7:11 0 16.9M 1 loop /snap/mcpelauncher-thesonicmaster/10
loop12 7:12 0 51M 1 loop /snap/snap-store/547
loop13 7:13 0 64.8M 1 loop /snap/gtk-common-themes/1514
loop14 7:14 0 51M 1 loop /snap/snap-store/542
loop15 7:15 0 65.1M 1 loop /snap/gtk-common-themes/1515
loop16 7:16 0 76.7M 1 loop /snap/discord/122
loop17 7:17 0 162.9M 1 loop /snap/gnome-3-28-1804/145
loop18 7:18 0 99.4M 1 loop /snap/core/11187
loop19 7:19 0 55.5M 1 loop /snap/core18/1997
loop20 7:20 0 219M 1 loop /snap/gnome-3-34-1804/66
loop21 7:21 0 32.3M 1 loop /snap/snapd/12159
loop22 7:22 0 141.5M 1 loop /snap/chromium/1646
sda 8:0 0 931.5G 0 disk
├─sda1 8:1 0 480M 0 part
└─sda2 8:2 0 931G 0 part /
sdc 8:32 0 931.5G 0 disk
└─sdc1 8:33 0 931.5G 0 part
and I used to see the volume group attached to the sdc output from lsblk. But not anymore.
How do I recover drive data from a broken logical volume group?
Diagnostics:
root@bradNewInspiron15:/etc/xen# pvs
File descriptor 58 (/run/user/1000/gnome-shell-disable-extensions (deleted)) leaked on pvs invocation. Parent PID 4855: bash
File descriptor 84 (/home/brad/.local/share/gvfs-metadata/home (deleted)) leaked on pvs invocation. Parent PID 4855: bash
File descriptor 85 (/home/brad/.local/share/gvfs-metadata/home-aa10c3e6.log (deleted)) leaked on pvs invocation. Parent PID 4855: bash
File descriptor 87 (/home/brad/.local/share/gvfs-metadata/trash:) leaked on pvs invocation. Parent PID 4855: bash
File descriptor 88 (/home/brad/.local/share/gvfs-metadata/trash:-7372c3e8.log) leaked on pvs invocation. Parent PID 4855: bash
PV VG Fmt Attr PSize PFree
/dev/sdc1 vg0 lvm2 a-- <931.51g <811.51g
root@bradNewInspiron15:/etc/xen# vgs
File descriptor 58 (/run/user/1000/gnome-shell-disable-extensions (deleted)) leaked on vgs invocation. Parent PID 4855: bash
File descriptor 84 (/home/brad/.local/share/gvfs-metadata/home (deleted)) leaked on vgs invocation. Parent PID 4855: bash
File descriptor 85 (/home/brad/.local/share/gvfs-metadata/home-aa10c3e6.log (deleted)) leaked on vgs invocation. Parent PID 4855: bash
File descriptor 87 (/home/brad/.local/share/gvfs-metadata/trash:) leaked on vgs invocation. Parent PID 4855: bash
File descriptor 88 (/home/brad/.local/share/gvfs-metadata/trash:-7372c3e8.log) leaked on vgs invocation. Parent PID 4855: bash
VG #PV #LV #SN Attr VSize VFree
vg0 1 8 0 wz--n- <931.51g <811.51g
root@bradNewInspiron15:/etc/xen# lvs
File descriptor 58 (/run/user/1000/gnome-shell-disable-extensions (deleted)) leaked on lvs invocation. Parent PID 4855: bash
File descriptor 84 (/home/brad/.local/share/gvfs-metadata/home (deleted)) leaked on lvs invocation. Parent PID 4855: bash
File descriptor 85 (/home/brad/.local/share/gvfs-metadata/home-aa10c3e6.log (deleted)) leaked on lvs invocation. Parent PID 4855: bash
File descriptor 87 (/home/brad/.local/share/gvfs-metadata/trash:) leaked on lvs invocation. Parent PID 4855: bash
File descriptor 88 (/home/brad/.local/share/gvfs-metadata/trash:-7372c3e8.log) leaked on lvs invocation. Parent PID 4855: bash
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
lv-vm-debian01 vg0 -wi-a----- 15.00g
lv-vm-debian02 vg0 -wi-a----- 15.00g
lv-vm-mint01 vg0 -wi-a----- 15.00g
lv-vm-mint02 vg0 -wi-ao---- 15.00g
lv-vm-suse01 vg0 -wi-a----- 15.00g
lv-vm-suse02 vg0 -wi-a----- 15.00g
lv-vm-ubuntu01 vg0 -wi-a----- 15.00g
lv-vm-ubuntu02 vg0 -wi-a----- 15.00g
I get this error that pertains to the LV drive in question.
Jun 19 22:43:54 bradNewInspiron15 kernel: Buffer I/O error on dev dm-7, logical block 0, async page read
I am able to reactivate my volume group.
root@bradNewInspiron15:/etc/xen# vgchange -a y vg0
File descriptor 58 (/run/user/1000/gnome-shell-disable-extensions (deleted)) leaked on vgchange invocation. Parent PID 4855: bash
File descriptor 84 (/home/brad/.local/share/gvfs-metadata/home (deleted)) leaked on vgchange invocation. Parent PID 4855: bash
File descriptor 85 (/home/brad/.local/share/gvfs-metadata/home-aa10c3e6.log (deleted)) leaked on vgchange invocation. Parent PID 4855: bash
File descriptor 87 (/home/brad/.local/share/gvfs-metadata/trash:) leaked on vgchange invocation. Parent PID 4855: bash
File descriptor 88 (/home/brad/.local/share/gvfs-metadata/trash:-7372c3e8.log) leaked on vgchange invocation. Parent PID 4855: bash
8 logical volume(s) in volume group "vg0" now active
But VM still boots to install CD instead of the installed OS.
This is my xen configuration.
root@bradNewInspiron15:/etc/xen# xl create lv-vm-debian01.cfg
Parsing config from lv-vm-debian01.cfg
root@bradNewInspiron15:/etc/xen# cat create lv-vm-debian01.cfg
cat: create: No such file or directory
#
# Configuration file for the Xen instance lv-vm-debian01, created
# by xen-tools 4.8 on Sat Jun 12 23:23:36 2021.
#
builder = "hvm"
bootloader = 'pygrub'
vcpus = '2'
memory = '3144'
disk = [
'phy:/dev/vg0/lv-vm-debian01,xvda,rw',
'file:/home/brad/Downloads/debian-10.9.0-amd64-netinst.iso,xvdb:cdrom,r'
]
name = 'hvm-debian01'
dhcp = 'dhcp'
vif = [ 'type=ioemu, model=e1000, bridge=br0' ]
on_poweroff = 'destroy'
on_reboot = 'restart'
on_crash = 'restart'
# Set boot order (d = CDROM, c = HDD)
#boot = "dc"
boot = "c"
# Use VESA-compliant display with more VRAM
vga = "stdvga"
videoram = 64
# Use VNC for display
vnc = 1
vncconsole=1
#vnclisten = "*"
vncdisplay = 0
vncpasswd = "hahaha"
usbdevice=['tablet']
