topic Grafana/Harvest - WAFL Write cleaning in Active IQ Unified Manager Discussions

Grafana/Harvest - WAFL Write cleaning

marcinlubojanski — Wed, 04 Jun 2025 14:54:23 GMT

Hello,

Anyone can tell me what is "WAFL Write cleaning" displayed under node - system utilization ?

Is that activity trriggered for free-space-realloc?

Last night at ~23:00 I do se increased write latency for up to 200ms with no increase of write workload and some increase of read requests. Disk are busy but less loaded than few hours before. The only corelation is with "WAFL Write cleaning".

What can I do to mitigate this latency in the future or what to check further ?

Re: Grafana/Harvest - WAFL Write cleaning

madden — Fri, 30 Jun 2017 08:37:41 GMT

Hi @marcinlubojanski

Please check this post for a discussion. Any questions on that one let me know!

Cheers,
Chris Madden

Solution Architect - 3rd Platform - Systems Engineering NetApp EMEA (and author of Harvest)

Blog: It all begins with data

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