ReFS filesystem not responding periodically

[extratype]

(Also posted on Q&A)

• Storage spaces, Simple (no parity), Thin provisioning
• Virtual disk larger than 100 TB, 10's of TBs used
• ReFS 3.7

The filesystem is not responding for about 1 minute, for every ~25 minutes according to the Microsoft-Windows-ReFS/Operational event log (Event ID 147). A thread in the System process has ~100% core usage so I took a stack trace:

ntoskrnl.exe!KiDeliverApc+0x1b6
ntoskrnl.exe!KiApcInterrupt+0x328
ReFS.SYS!CmsRotatingSkipList<_RANGE,SmsAllocationRegionEx,OrderByStartOfRange,RegionLockPolicies>::InlineRebalance+0x98
ReFS.SYS!CmsRotatingSkipList<_RANGE,SmsAllocationRegionEx,OrderByStartOfRange,RegionLockPolicies>::Add+0x1d0
ReFS.SYS!CmsAllocator::SplitRangeOnlyRegion+0x386
ReFS.SYS!CmsAllocator::PinBitmapRegion+0x3176c
ReFS.SYS!CmsAllocator::TryProtectRangeIfDurablyFree+0x9b
ReFS.SYS!CmsThinProvisioning::UnmapWorkItemMethod+0x2e4
ReFS.SYS!<lambda_9a1cd484752ca8e9f6e914453bf80744>::<lambda_invoker_cdecl>+0x15
ReFS.SYS!MspWorkerRoutine+0x46
ntoskrnl.exe!ExpWorkerThread+0x14f
ntoskrnl.exe!PspSystemThreadStartup+0x55
ntoskrnl.exe!KiStartSystemThread+0x34

[#2]

If the cpu's are at 100% (Don't know how many you have in the system), is there also a lot of network traffic on the system? Is there a task which dumps a lot of data on the system every half our for example? Had issues like this in the past with another (Non Storage Space) while dumping a backup database which was done with such speed that the disk system just couldn't handle it.

[#3]

Did you discover that the problem is?

[#4]

This issue is about the ReFS filesystem itself so I think only Microsoft employees can address it.

[#5]

Ok, I also see your post here https://docs.microsoft.com/en-us/answers/questions/704549/refs-filesystem-not-responding-periodicall... . But is creating a ticket with official Microsoft Support perhaps a better idea?

[#6]

I don't know how to create a support ticket. Via the 'Get Help' app?

[#7]

I think you can try https://support.serviceshub.microsoft.com/supportforbusiness , but if you have a Microsoft Partner (For licensing etc.) you could ask them?