LVM merging from snapshots don't work.
I have two logical volume - one is for the entire system and one is a
snapshot that I have created if I want to revert things if an upgrade
breaks them.
This is the output of *lvs*
LV VG Attr LSize Pool Origin Data% Meta% Move
Log Cpy%Sync Convert
before_upgrade vgfedora swi-a-s--- 30.00g fedora 22.84
fedora vgfedora owi-aos--- 50.00g
Now I perform my upgrade by running *sudo dnf upgrade -y*, the upgrade
completes without any problems.
Now if I want to revert back to my old system state that is the snapshot
*before_upgrade*, I boot into a Live Fedora 31 environment and open my
encrypted partition using
$ cryptsetup open /dev/sda3 dm_crypt
And I issue the command:
$ lvconvert --merge /dev/vgfedora/before_upgrade
This works as expected until it hits 100%:
vgfedora/fedora: Merged: 99.59%
vgfedora/fedora: Merged: 99.90%
vgfedora/fedora: Merged: 100.00%
It hangs completely.
It has been almost 3 hours and I have not seen the status change.
Hitting *Ctrl + C* now will produce the following output:
^C Interrupted...
Giving up waiting for lock.
Can't get lock for vgfedora
Can't reread VG for vgfedora/fedora error flags 2
If I reboot the restoration has not been done and the logical volume
*before_upgrade* has vanished.
Here is my layout:
lsblk -f
NAME FSTYPE LABEL UUID FSAVAIL FSUSE%
MOUNTPOINT
sda
├─sda1
│ ext4 2ea20bf9-ee56-490f-b12d-bd8d34e2fa3f 694.3M 22%
/boot
└─sda2
crypto b09a1a64-9b05-4c23-b048-1eacd03cf60b
└─luks-b09a1a64-9b05-4c23-b048-1eacd03cf60b
LVM2_m B0i0fa-Yxme-Yntt-9uwM-VpFU-3xSB-K774pD
├─vgfedora-fedora-real
│
│ ├─vgfedora-fedora
│ │ ext4 root 1176ad7d-d3e7-4062-b799-8e2b761f10af 39.5G 14%
/
│ └─vgfedora-before_upgrade
│ ext4 root 1176ad7d-d3e7-4062-b799-8e2b761f10af
└─vgfedora-before_upgrade-cow
└─vgfedora-before_upgrade
ext4 root 1176ad7d-d3e7-4062-b799-8e2b761f10af
What is going on ?
Interestingly I have tried the same thing in other distributions like
Ubuntu and this works. So seems like a Fedora specific issue.
Let me know if any other information is required, like any other log files.
Thanks.
--
Regards,
Sreyan Chakravarty
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