Love this topic! I read all the posts here and I am still a bit confused. Please forgive my ignorance about hardware, but I am trying 🙂 I have been trying to figure out how to increase my disk speeds on my array and was told in a discord channel that I was stuck at my current speeds and there was nothing to be done about it. BUT, I kept on looking and found this wonderful article which I have learned a great deal from. My problem, my array of 18 disks is doing read/write at ~100mb and am currently shrinking my array using the second non-volatile procedure of moving the data using unbalance and then 0'ing out the drive to update parity, etc, etc. but am only getting 69.8 MB/s. As can be seen here:
Here is my array:
Here is my setup Unraid 6.12.3:
GA-7PESH2 GIGABYTE Intel Rev1.0 LGA2011 E-ATX Server Motherboard LSI2008 8x SAS/SATA, 2x 10G X540-AT2, Avocent IPMI 2.0 (GA-7PESH2)
2x Intel Xeon E5-2690 v2 3.0GHz 10 Core 25MB Cache Processors
128GB DDR3 1600MHz ECC Registered Memory 8x 16GB
HP 487738-001 468405-001 24-Bay 3Gb SAS Expander Card
Samsung 860 QVO 1TB 2.5 Inch SATA III Internal SSD (MZ-76Q1T0B/AM) x2 Cache
24 x 8+ TB Drives
I want to try to maximize bandwidth since it is taking me ~40 hours to "0" out an 8TB drive. From what I have read, I am now thinking I need to get 2 SAS cards to do this, but was hoping you might confirm that a good option would be 2x LSI 9305-24i's.