XCP-ng 8.3 updates announcements and testing

[stormi]

@bufanda I'm being told it's expected to have it the first time after the update, but in theory the next ones should be not be fulls. Can you try?

[stormi]

@acebmxer with qcow2, the way we scan the SR regularly uses more I/O, so this may explain it.

[acebmxer]

@stormi said:

@acebmxer with qcow2, the way we scan the SR regularly uses more I/O, so this may explain it.

Thanks for the update, that this is expected. I think it its a bit a excessive being its only 4 -5 vms.

[bufanda]

@stormi said:

@bufanda I'm being told it's expected to have it the first time after the update, but in theory the next ones should be not be fulls. Can you try?

Just checked and the VM I was testing with was part of two backups and it seems that when one runs and the second starts that it will fall back. I removed the VM now from one backup and with being only member of one backup job it looks good then. Will keep an eye on it.

[stormi]

@acebmxer Can you evaluate the amount of data transferred at each spike? So that we can evaluate if it's more than expected. What's the total size of the VM disks?

[acebmxer]

@stormi

Left side of chart is all VMS running. 1.5gb/s each vm's vdi ranges from 128gb - 256gb allocated. Actual disk spaced used not sure)

The 200mb/s - 300mb/s on far right is just XO-CE running idle.

So if each vm is consuming 300mb/s ish times 4 -5 vms would get close to the 1.5gb/s.

[stormi]

Thanks. Ping @Team-Storage

[acebmxer]

@stormi said:

Thanks. Ping @Team-Storage

I think these screenshot better show the picture. It shows more or seems more dramatic on truenas.
That is two cloud inti vms 1 ubuntu and 1 alma, And 1 existing vm running on the qcow2 enabled SR.

Both SR are on the same truenas just different data sets.

[ravenet]

One thing I noticed was manually copying a qcow2 disk to an sr, with a properly generated UUID, would lock up the sr from scanning disks and updating its inventory db.
Running VMs seemed fine.

Deleting that manually copied disk from sr released the lock.

Rodney

[stormi]

We just published most of the updates tested above, plus embargoed security fixes:

https://xcp-ng.org/blog/2026/04/28/april-2026-security-and-maintenance-updates-for-xcp-ng-8-3-lts/

The release of the QCOW2 image format feature (packages sm, sm-fairlock and blktap) is planned in the coming days. You can still update a system which has these test packages with the security updates published today.

Thanks everyone for the tests!

[manilx]

@stormi Updated 2 pools @office but on both RPU failed after updating master and emptying secondary host. Had to install patches manually and then move VM's back......