Disk Migrations with io_uring

adamb

Famous Member
Mar 1, 2012
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Getting this trying to move a disk.

1687368500422.png

Moving disks from Ceph to LVM iscsi storage. What I don't understand is all the disks on the LVM iscsi storage that are in place now are using aio=io_uring by default.

So if aio=io_uring is bad for this disk type, then why is it default when creating a VM on said storage? Yet I can't move the disk to it?

1687368598104.png
 
Are you running a cluster and are all nodes properly updated and running the latest software?
What is the output of "pveversion -v" and what are the current setting of the Ceph drive.

In latest 7.4 I cant reproduce your error message, so perhaps the checks were relaxed. The defaults/warning went through a few iterations.


Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox
 
Are you running a cluster and are all nodes properly updated and running the latest software?
What is the output of "pveversion -v" and what are the current setting of the Ceph drive.

In latest 7.4 I cant reproduce your error message, so perhaps the checks were relaxed. The defaults/warning went through a few iterations.


Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

No atm some are on newer version as we are having performance and live migration issues between kernels.
 
Hi,
some storage dont support well aio_uring , other works fine with it.

The problem is that currently, live storage migration can't change it on the fly.
Yes, without changing it, you risk crashes and hangs when migrating to certain storages: https://git.proxmox.com/?p=qemu-server.git;a=commit;h=8fbae1dc8f9041aaa1a1a021740a06d80e8415ed

There is a plan to change some internals and be able to change the setting during disk migration/mirroring, but it's not implemented yet.
 

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