topic Re: FSA Explorer showing large discrepancy for storage used when compared to storage directly in ONTAP Discussions

FSA Explorer showing large discrepancy for storage used when compared to storage directly

dogStore — Wed, 04 Jun 2025 09:56:24 GMT

I am looking into a NetApp cluster running ONTAP 9.9.1P4 which when looking at File System Analytics (FSA) Explorer, there's a big discrepancy reported when compared to a quota report.

For example a qtree has 146TB used although FSA reports this as 107TB used:

For awareness, this system is using FlexGroups.

This KB suggests turning the FSA feature off and on again:

https://kb.netapp.com/Advice_and_Troubleshooting/Data_Storage_Software/ONTAP_OS/File_system_analytics_(FSA)_gives_wrong_report

Although it is expected that the recalculation may take weeks to complete on this storage.

Are there any other options that I could take?

I would really appreciate any input anyone has for this.

Thanks in anticipation 🙂

Re: FSA Explorer showing large discrepancy for storage used when compared to storage directly

paul_stejskal — Tue, 18 Oct 2022 14:07:20 GMT

Could the difference be snapshots or logical vs physical space used? I'd say open a case for this.

Re: FSA Explorer showing large discrepancy for storage used when compared to storage directly

dogStore — Wed, 19 Oct 2022 12:00:53 GMT

Cheers, I suppose that's a possibility of where the difference is coming from.

Sadly, I don't have the option to raise a case available to me which is why I have raised it here. Is there any way you can tell me more about how FSA actually calculates this?

Re: FSA Explorer showing large discrepancy for storage used when compared to storage directly

paul_stejskal — Wed, 19 Oct 2022 15:10:02 GMT

Without a case it will be hard to troubleshoot further. We do not reveal how things are calculated on public forums. Also a TSE would need access to AutoSupport data or logs to review further.

Re: FSA Explorer showing large discrepancy for storage used when compared to storage directly

dogStore — Thu, 20 Oct 2022 10:00:36 GMT

Thanks Paul, I understand

Have a good one 🙂