Active IQ Unified Manager Discussions

disk scrub generating too much i/o



our FAS3160 filer reports a crazy i/o load during disk scrub interval.

On an aggregate with 7 SATA disks, DFM reports a throughput of 4000 blocks/sec, which I think is impossible.

We also have our monitoring system, which uses NetApp API, reporting the same result.

How can this be possible?

Any help appreciated



anyone has an idea about this issue?


Hi Alessio,

I've seen a Filer run with around 5000 IOPs during a disk scrub reported by Balance as an "Internal Process " but there was also contention with Snap Deletes, backups and volumes not being reallocated.  The first few spindles were trying to service 450+ IOPs a piece!  All I can suggest is to turn off features such as ASIS, snaps, etc and see if your Filer responds better during the scrub.

Good Luck!

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