Hi All...

 

I'm very new to Unraid.  I've got 6.8.3 installed and I've bonded eth0 and eth1 (802.3ad) (each 1gb).  I've setup 4 disk (3-disks for data, 1-disk for parity) and 1 nvme for cache.  I'm having issue with write speeds.  I'm only getting a max of 46MB/s on writing data to my test share.  This speed is constant.  I can write from a VM to my PC and get over 100MB/s.  I've also tried setting up a 10GB network card connecting to my VM and there I'm getting 280 MB/s constant.  I've already changed "Tunable (md_write_method)" to reconstruct write and I didn't see any changes.

 

Please let me know what else you need from me so that I can get this issue resolved.

 

Thanks

Go to Tools - Diagnostics and attach the complete diagnostics zip file to your NEXT post.

Hi @trurl

 

Here is the Diagnostics

unraid-1-diagnostics-20200317-1757.zip

Good to run iperf first to rule out any network issue.

Thank you @johnnie.black.  I just ran iperf3 on it and I found my issue.  I had a brain fart and realized that i had to go through my router since it was on a different vlan (unraid to servers).  I changed the IP address and it now is transferring at over 100 MB/s.  Although...the 10GB network (direct connect) is not getting the write speeds like what iperf3 is showing:

 

[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-1.00   sec   606 MBytes  5.08 Gbits/sec
[  4]   1.00-2.00   sec   531 MBytes  4.45 Gbits/sec
[  4]   2.00-3.00   sec   590 MBytes  4.95 Gbits/sec
[  4]   3.00-4.00   sec   508 MBytes  4.26 Gbits/sec
[  4]   4.00-5.00   sec   540 MBytes  4.53 Gbits/sec
[  4]   5.00-6.00   sec   516 MBytes  4.33 Gbits/sec
[  4]   6.00-7.00   sec   538 MBytes  4.52 Gbits/sec
[  4]   7.00-8.00   sec   503 MBytes  4.22 Gbits/sec
[  4]   8.00-9.00   sec   541 MBytes  4.54 Gbits/sec
[  4]   9.00-10.00  sec   407 MBytes  3.41 Gbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-10.00  sec  5.16 GBytes  4.43 Gbits/sec                  sender
[  4]   0.00-10.00  sec  5.16 GBytes  4.43 Gbits/sec                  receiver

iperf Done.
 

File transfer is going at 283 MB/s.

 

Any idea on that? (it's not all that bad after all)

 

Edited March 18, 20206 yr by APD189

There's always some overhead on transfers, normal to get a little less than iperf on real world, most important IMHO are the lowish iperf results, when all is optimal you should get close to line speed on iperf.