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Re: block snapshot issue with RBD


From: Jin Cao
Subject: Re: block snapshot issue with RBD
Date: Mon, 27 May 2024 10:56:41 -0700
User-agent: Mozilla Thunderbird

CC block and migration related address.

On 5/27/24 12:03 AM, Jin Cao wrote:
Hi,

I encountered RBD block snapshot issue after doing migration.

Steps
-----

1. Start QEMU with:
./qemu-system-x86_64 -name VM -machine q35 -accel kvm -cpu host,migratable=on -m 2G -boot menu=on,strict=on rbd:image/ubuntu-22.04-server-cloudimg-amd64.raw -net nic -net user -cdrom /home/my/path/of/cloud-init.iso -monitor stdio

2. Do block snapshot in monitor cmd: snapshot_delete_blkdev_internal. It works as expected: the snapshot is visable with command`rbd snap ls pool_name/image_name`.

3. Do pseudo migration with monitor cmd: migrate -d exec:cat>/tmp/vm.out

4. Do block snapshot again with snapshot_delete_blkdev_internal, then I get:    Error: Block format 'raw' used by device 'ide0-hd0' does not support internal snapshots

I was hoping to do the second block snapshot successfully, and it feels abnormal the RBD block snapshot function is disrupted after migration.

BTW, I get the same block snapshot error when I start QEMU with:
     "-drive format=raw,file=rbd:pool_name/image_name"

My questions is: how could I proceed with RBD block snapshot after the pseudo migration?



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