Unbearably slow write speed of Unraid (under 10MB/s, other pool to array, not through network)

[plenty_box]

• reconstruct write is enabled
• nothing is accessing arryay (I think)
• I'm using krusader.
• transferring file size is > 3GB
• ALL HDD's SMART have no problem

 

Edit: It's NOT about network.

 

I don't know why it's so slow. My array contains both SMR and CMR disk but the speed should be at least 50MB/s (hopefully 100MB/s) .

Any advice is welcome.

 

unraid-diagnostics-20240702-1302.zip

Edited July 2 by plenty_box

[JorgeB]

Start by running a single stream iperf test in both directions to confirm the LAN is good.

[plenty_box]

52 minutes ago, JorgeB said:

Start by running a single stream iperf test in both directions to confirm the LAN is good.

as I said in title, it's totally unrelated to LAN. This is about the problem between array and pool.

[JorgeB]

1 hour ago, plenty_box said:

as I said in title, it's totally unrelated to LAN.

Sorry, read too fast and missed that part, start a large transfer from a pool to the array, wait like a minute, grab new diags while the transfer is still going one, post those.

[plenty_box]

On 7/2/2024 at 7:09 PM, JorgeB said:

Sorry, read too fast and missed that part, start a large transfer from a pool to the array, wait like a minute, grab new diags while the transfer is still going one, post those.

unraid-diagnostics-20240704-0105.zipHere it is. This is diags in the middle of a large

thanks in advance

[JorgeB]

Diags done't show any array activity, try this instead:

 

pv /mnt/pool_name/path_to_large_file > /mnt/disk19/file_name

 

post the output from that, and you can then delete that file:

 

rm /mnt/disk19/file_name

 

 

[plenty_box]

On 7/4/2024 at 1:33 AM, JorgeB said:

Diags done't show any array activity, try this instead:

 

pv /mnt/pool_name/path_to_large_file > /mnt/disk19/file_name

 

post the output from that, and you can then delete that file:

 

rm /mnt/disk19/file_name

 

 

root@Unraid:~# pv /mnt/cache_hdd_third/t2/test.mp4 > /mnt/disk19/file_name
11.7GiB 0:07:08 [28.0MiB/s] [==================================================================================================>] 100%  

I cannot attach diags because download button gave me 404

[plenty_box]

 It's NOT about a network problem.

The read speed of the HDD itself is nearly 200 mb/s
https://docs.unraid.net/legacy/FAQ/check-harddrive-speed/

 

But when I actually try to copy the data on this HDD to the array, I only get about 20-30 mb/s.
I'm not even sure if I can accurately call this a ZFS pool. I have one HDD formatted with ZFS on Unraid and just use it like a cache pool.

When I copy data from, say, another PC to the Array through LAN, I get speeds of about 100mb/s with no problems.

 

[JorgeB]

Run the diskspeed container tests, both the disks and controllers tests.