disk scrub generating too much i/o
2013-02-25 05:58 AM
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
Re: disk scrub generating too much i/o
2013-06-16 06:46 PM
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.