Parity Sync/Data Rebuild Slow at 30MB/s?

[a7x88]

Hi All

 

Pulled a 500GB HDD from the array yesterday and replaced with a new 4TB WD Red. I followed the parity swap procedure (old parity was a 3TB red). It copied the parity over to the new 4TB and is now rebuilding the array with the old 3TB taking place of the 500GB I pulled.

 

Rebuild speed seems very slow though and seems to be maxing out at 30MB/s which seems pretty slow to me.

 

Diagnostic report attached

 

Thanks

nas-diagnostics-20180817-1346.zip

[a7x88]

Update - rebuild completed @ an average of 35MB/s

 

Started a parity check which is happening at ~120MB/s which is more what I'd expect. Send write is the limiting factor. I'm on a N54L microserver so may check write cache I'd enabled

[JorgeB]

4 hours ago, a7x88 said:

I'm on a N54L microserver so may check write cache I'd enabled

I bet it's disable.