Closed
Description
System information
| Type | Version/Name |
|---|---|
| Distribution Name | Arch Linux |
| Distribution Version | |
| Kernel Version | 6.6.0-rc4 |
| Architecture | amd64 |
| OpenZFS Version | git branch zfs-2.2-release (229ca7d) + 6.6 compatibility patches |
Describe the problem you're observing
Installing a distro in virt-manager leads to an unbootable virtual machine if the storage is backed by ZVOLs.
I'm using zvol_use_blk_mq=1 but I'm not sure if this is the culprit because I didn't try disabling it yet.
I've just tried with zvol_use_blk_mq=0 and it works flawlessly so the culprit is definitely zvol_use_blk_mq=1
This is the libvirt disk:
<disk type="block" device="disk">
<driver name="qemu" type="raw" cache="none" error_policy="stop" discard="unmap" io="native"/>
<source dev="/dev/zvol/rpool/zvols/ubuntu-23.10"/>
<blockio physical_block_size='16384'/>
<target dev="vda" bus="virtio"/>
<boot order="2"/>
</disk>
Describe how to reproduce the problem
Download latest snapshot of ubuntu 23.10.
Create a vol:
zfs create -s -V 100G -o compression=lz4 rpool/zvols/ubuntu-23.10
Install ubuntu in the zvol using virt-manager.
Reboot the vm and watch it failing to boot:
Using raw images instead leads to a perfectly bootable system.