ONTAP Hardware
ONTAP Hardware
Hello,
I got a question from customer and don't know how to explain it. Is there any document or idea to answer this question?
Question:
what if there is a situation like the disk reconstruction is being proceed and this process give an impact to the performance of foreground I/O.
Will foreground I/O get less performance impact if changing value of raid.reconstruct.perf_impact to low during disk reconstruction? Or the change will be reflected in the disk reconstruction.
cluster1::> storage raid-options modify -node * -name raid.reconstruct.perf_impact -value low
ONTAP does automatically make sure that a reconstruct has no impact. In the incredibly rare events it has you can use the option but I have not seen it needed in years.
Customer know the reconstruction have no impact but they still want to know if changing the value of the raid.reconstruct.perf_impact to low will directly reflect to the disk reconstruction that is being proceed.
Low
In short, setting it to low will slow down reconstruction.
I've never got a conclusive answer but I've heard that in newer versions of ONTAP this was fixed. In older versions it was a RFE to be dynamic during a disk reconstruct but never got any traction.