Here's the output from my run:
Tunables Report from unRAID Tunables Tester v2.2 by Pauven
NOTE: Use the smallest set of values that produce good results. Larger values
increase server memory use, and may cause stability issues with unRAID,
especially if you have any add-ons or plug-ins installed.
Test | num_stripes | write_limit | sync_window | Speed
--- FULLY AUTOMATIC TEST PASS 1 (Rough - 20 Sample Points @ 3min Duration)---
1 | 1408 | 768 | 512 | 112.8 MB/s
2 | 1536 | 768 | 640 | 113.0 MB/s
3 | 1664 | 768 | 768 | 113.3 MB/s
4 | 1920 | 896 | 896 | 113.4 MB/s
5 | 2176 | 1024 | 1024 | 113.7 MB/s
6 | 2560 | 1152 | 1152 | 114.0 MB/s
7 | 2816 | 1280 | 1280 | 114.0 MB/s
8 | 3072 | 1408 | 1408 | 114.0 MB/s
9 | 3328 | 1536 | 1536 | 114.1 MB/s
10 | 3584 | 1664 | 1664 | 114.0 MB/s
11 | 3968 | 1792 | 1792 | 114.1 MB/s
12 | 4224 | 1920 | 1920 | 114.1 MB/s
13 | 4480 | 2048 | 2048 | 114.2 MB/s
14 | 4736 | 2176 | 2176 | 114.2 MB/s
15 | 5120 | 2304 | 2304 | 114.2 MB/s
16 | 5376 | 2432 | 2432 | 114.2 MB/s
17 | 5632 | 2560 | 2560 | 114.2 MB/s
18 | 5888 | 2688 | 2688 | 114.1 MB/s
19 | 6144 | 2816 | 2816 | 114.1 MB/s
20 | 6528 | 2944 | 2944 | 114.2 MB/s
--- Targeting Fastest Result of md_sync_window 2048 bytes for Final Pass ---
--- FULLY AUTOMATIC TEST PASS 2 (Final - 16 Sample Points @ 4min Duration)---
21 | 4280 | 1928 | 1928 | 113.6 MB/s
22 | 4296 | 1936 | 1936 | 114.0 MB/s
23 | 4320 | 1944 | 1944 | 114.0 MB/s
24 | 4336 | 1952 | 1952 | 114.0 MB/s
25 | 4352 | 1960 | 1960 | 113.9 MB/s
26 | 4368 | 1968 | 1968 | 114.0 MB/s
27 | 4384 | 1976 | 1976 | 114.0 MB/s
28 | 4408 | 1984 | 1984 | 113.9 MB/s
29 | 4424 | 1992 | 1992 | 113.9 MB/s
30 | 4440 | 2000 | 2000 | 113.9 MB/s
31 | 4456 | 2008 | 2008 | 113.9 MB/s
32 | 4480 | 2016 | 2016 | 114.0 MB/s
33 | 4496 | 2024 | 2024 | 113.9 MB/s
34 | 4512 | 2032 | 2032 | 114.0 MB/s
35 | 4528 | 2040 | 2040 | 113.9 MB/s
36 | 4544 | 2048 | 2048 | 113.9 MB/s
Completed: 2 Hrs 8 Min 26 Sec.
Best Bang for the Buck: Test 1 with a speed of 112.8 MB/s
Tunable (md_num_stripes): 1408
Tunable (md_write_limit): 768
Tunable (md_sync_window): 512
These settings will consume 22MB of RAM on your hardware.
Unthrottled values for your server came from Test 22 with a speed of 114.0 MB/s
Tunable (md_num_stripes): 4296
Tunable (md_write_limit): 1936
Tunable (md_sync_window): 1936
These settings will consume 67MB of RAM on your hardware.
This is -93MB less than your current utilization of 160MB.
NOTE: Adding additional drives will increase memory consumption.
In unRAID, go to Settings > Disk Settings to set your chosen parameter values.