I have a QNAP with 4x 16tb drives in the system. The problem I am running into is when I am using my other QNAP, 673a running QuTS Hero/ZFS (6x 16tb drives), doing a Hybrid Backup Station copy of data.  The folder I am using for testing purposes primarily contains ISO images (software share). As the data copies over, file copies will pop up to around 3gb (10gb network) and then all of a sudden, everything will stop.  The QNAP seems to be waiting on the Unraid system to do something, write files to disk?  move them around to other disks?  I'm not sure what's going on, but it took close to 4 hours to copy 289gb of data over.  I tried changing the allocation method, file system type (xfs, zfs, brtfs), etc.  Does Unraid require some sort of 'fast m.2 solid state cache' to sit between the raid volume and incoming data to keep up with writes?  I wiped the setup and installed TrueNAS and everything performed as expected there - sustained 2gb+ file transfers. But TrueNAS has very little hardware support via BSD and the disks without plugins to properly spin up fans to cool them down were running at high temperature. 

 

Any ideas?  I plan to put Unraid back on it here soon to try whatever suggestions the community has.  

Thanks!

Are you using the unRAID array or a pool? You cannot compare the array with a Truenas pool, since the array does not stripe data, and parity will slow down writes by a lot, it's a little faster with turbo write enabled, but never the same as a striped pool, though you can also create pools with Unraid.

Just did a fresh deployment of 6.12.9.

Well, I dont think I set any of this up correctly the first time. Watching a video and this time I did the following config. 
Plugged in a 256gb USB drive so I have 1 array disk (odd requirement) and then I took and all 4 of the 16tb and added them to a pool which I just formatted as zfs raidz 1 group of 4 devices - compression off.  Should I turn off autotrim?

 

13 minutes ago, userano218n said:

Should I turn off autotrim?

Yes if they are SSDs.