Slow parity check?

[tomc]

I've been using Unraid for about a year and a half now. My use is nothing exotic, just as a backup destination for several computers on my local network.

 

My array is currently 2 16 TB parity drives and 3 data drives (14, 14, 16). SATA interface. 

 

Parity check takes about 50 hours for that array. The speed is about 85 Mbytes/sec. Is that about what you would expect?

 

Also, the array is about 75% full. Any guidance on how full it can get before it would be a good idea to add an additional data drive?

[JorgeB]

40 minutes ago, tomc said:

The speed is about 85 Mbytes/sec. Is that about what you would expect?

That's on the slow side, start by posting the diagnostics so we can see the hardware.

[tomc]

I've attached the diagnostics file, and the summary of the parity check that just completed.

 

tower-diagnostics-20231106-0949.zip

Edited November 6, 2023 by tomc

[JorgeB]

You are using a controller with a SATA port multiplier, and 4 of the disks are sharing the same SATA port, so bandwidth is affected a lot, see here:

 

[tomc]

Thanks. 

 

I will look into better interface options.

 

What I have now works, but from that thread on recommended controllers it looks like it could be a lot faster.

 

Tom