New installation, Disappointing write performance

[CGlas2021]

I've recently decided to give the TrueNAS Core a try as it is the top rated NAS Software in the land! I was excited to install it and set it up, I've set up the datasets and CIFS shares, however now that I am starting to put my data on it, I am supremely disappointed with the write speed and can't seem to find a way to speed it up. I've enabled the autotune to see if it would help, but no noticeable difference has come from it.

Build Specs
CPU: Intel i5-4670K
RAM: 24GB DDR3
OS Disk: 2x 256GB SSDs in Mirror
Storage Array: 4 WD RED 8TB HDD in RAIDz1

I am writing about 15TB of Data to the PlexMedia share and it seems the data is being cached on the RAM first as it is slowly written to the storage pool. Is there any way to bypass the RAM Caching? It writes in bursts to the RAM as seen in the screenshot of the network monitor. all network interfaces are 1Gigabit, nothing fancy but I would hope for a steady data rate at least.

 

[c77dk]

Hi,

The "On" to the right in your screenshot - is that for dedup? Headers are missing so had to check with my own system.

 

[CGlas2021]

It is, yes. Could that be causing the dramatic write bursting?

 

[CGlas2021]

Hi,

The "On" to the right in your screenshot - is that for dedup? Headers are missing so had to check with my own system.

It is, yes. Could that be causing the dramatic write bursting behavior? I would expect the Dedupe to be more noticeable in the CPU and RAM Usage rather than burst writing.

 

[c77dk]

Dedupe demands a rather "crazy" system to work with good performance - with the hardware you have listed using it won't give you anything usable.

Disabling dedupe should give you a much better experience. I'm not sure if you have to move the data off the system and recreate pool to do it - hope somebody else can say something about that.