Server 2025 - high CPU and RAM

[pfeifix]

The ReFS memory exhaustion fix is expected from Microsoft in July for HCI23H2 and Windows Server 2025.

Any confirmation the fix is contained in July's cumulative update (KB5056579)?

[DaStivi]

i asked for update in my MS Premiere Case, as soon as the fix is released publicly and i haven't heard anything yet... and statement was that the release was planed more in august then in july... see a few post back from me...

[karsten123]

any news?

[ReKe]

Looks like the fix for Server 2025 could come next month. The actual Preview for Windows 11 shows the fix.

[File system] Fixed: This update addresses an issue in the Resilient File System (ReFS) where using backup applications on large files could occasionally result in system memory becoming fully exhausted.

https://support.microsoft.com/en-us/top ... df6bbfe9c3

[JTT]

Just got the same update from MS: I just wanted to provide you with a quick update regarding the ongoing ReFS issue

Our Product Group team has shared July 22, 2025—KB5062660 (OS Build 26100.4770) Preview - Microsoft Support for you to install on your affected server.
https://support.microsoft.com/en-us/top ... df6bbfe9c3

[karsten123]

did you install the update and does it fix the issue?

[JTT]

Yes, i installed it. On the positive side, the main issue with high disk usage spikes seems resolved. I´ll try to monitor the server. Also usually after restart, RAM usage went up, but now it seems also normal.

[karsten123]

sounds promising. fingers crossed