Because doing an update without rebooting doesn't reload the updated main programs, like XAPI. A host in only updated after a full reboot.
Posts
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RE: "NOT_SUPPORTED_DURING_UPGRADE()" error after yesterday's update
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RE: Xen Orchestra Node 24 compatibility
Can you reproduce the issue on XOA? Or it's only on the sources + your current OS?
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RE: API Fetching a list of users with OTP activated
Question for @mathieuRA I suppose

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RE: XCP-ng 8.3 and Dell R660 - crash during boot, halts remainder of installer process (bnxt_en?)
Yes!! Congrats for everyone (including you for the feedback @dcskinner !)
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RE: 🛰️ XO 6: dedicated thread for all your feedback!
Have you read the release announcement? You can upvote your most important features at https://feedback.vates.tech
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RE: 2FA doesn't load graphics properly after XO6 went default (XO from source)
Does it work OK without the proxy?
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RE: Unable to MIgrate VDI when host is low on free memory
Do you have dynamic memory set for your VM?
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RE: Unable to MIgrate VDI when host is low on free memory
Hi,
Low how? can you provide some numbers? Thanks!
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RE: 🛰️ XO 6: dedicated thread for all your feedback!
FYI, we are adding a more structured way to get your feedback on missing features that you consider the most important: https://feedback.vates.tech
You can sign in with your email or via your Github or Discord account.
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RE: XCP-ng 7.5 -> 8.3: Best VM Migration Path?
Hi,
IMHO, the less risky strategy with an acceptable downtime is to use warm migration to put everything on the new host, regardless which storage to use (local or shared).
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RE: host wont leave maintenance mode and xapi stoped working after atempting to join a host to a pool
Hi,
I can't tell it's the cause, but you should first use an officially supported client to manage it.
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RE: Plugins in XO6?
It won't disappear tomorrow, but I'd like to phase it out sooner than later (before 2027? who knows)
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RE: Plugins in XO6?
No plugin section for now, this will come after (for now, it's not even in the REST API, which is the first mandatory step before being displayed in XO 6).
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RE: XO Lite: Change URL
It's not meant to be used like that. If you are behind a NAT, the right approach is to have your XOA behind the NAT and inside the same network than the hosts.
That's because hosts will always use and return their internal IPs to connect to some resources (stats, consoles etc.). XOA deals with that easily as being the "main control point" for all hosts behind your NAT (or a XO proxy if you prefer).
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RE: Xen Orchestra Container Storage Interface (CSI) for Kubernetes
The roadmap depends a lot on the feedback we have on it
More demand/popular, faster we'll implement stuff 
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RE: XCP-NG 8.3 Crash on Shutdown - HP DL360 g9
Hmm it sounds like a hardware issue from here

Let me ask https://xcp-ng.org/forum/groups/team-os-platform-release
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RE: FILE RESTORE / overlapping loop device exists
Feel free to create a trial on an XOA, test stable and latest and tell us.
It might be also related to your environment, but if it works at some commit and not later, it's weird. @florent & @bastien-nollet maybe?