Server 2025 - high CPU and RAM

[alexandre.nakagawa]

Hello gostev and Johan
I installed a new Veeam server and physical proxies (256GB RAM) with Windows 2025.
I mapped the LUNs from the old servers (Windows 2022 REFS) to the new server.
We migrated on Friday, and early this morning, the server started freezing, with high CPU and memory usage.
I have repositories of 300TB each, with approximately 1PB of data in one of the repositories.
I applied the FileCacheLimitPercent registry keys, but the server remains unstable after 30 minutes of uptime.
Is there any Microsoft fix I can request when opening a support case with Microsoft?
Would you be able to provide this fix if I open a P0 support case with Veeam

[karsten123]

why do you not just wait for the official fix?

[Gostev]

Unfortunately we're never able to provide private fixes we receive from Microsoft for validation, as it's an intellectual property that does not belong to us and therefore we cannot redistribute it.

[DaStivi]

Can you post some reference number to help with a case at Microsoft to get the private hotfix without any more hassle ?

Waiting another month isn't a option for many if the server just stops responding without being able to create backups... And no none of us is willing to install another Server any maybe loose some weeks or months of backups ..

[alexandre.nakagawa]

why do you not just wait for the official fix?

Because my server is unresponsive and I missing almost 1PB of backups... the server run only for about 4 hours and freeze, it has 256GB o ram used.

and the sql databases are becoming unavailable per lack of space on transaction logs directory since the backup logs are not running, (our databases have 200TB each) and we do 30 min log backups.

[karsten123]

BEFORE jumping no scope on the 2025 train

… at least, its a valuable lesson

[alexandre.nakagawa]

I have other 3 veeam repositories that was migrated to 2025 and was running fine for a long time. this is our only server that had this bug, problably because the size of backups and repositories, small repo servers is working fine

[johan.h]

Understand that this is very frustrating. We were given KB9178699 at the time, private fixes should be requested from Microsoft (its their code after all). If that doesn't work use the private message feature to reach out to me and maybe I can help you push a little.

Separately, Alexandre, I've worked with your Veeam Support engineer on this one and I believe they have a plan in place for you.

[alexandre.nakagawa]

Ok, thanks johan, i received the update from veeam eng.