Besides the two SSDs I only see attempts to initialize another device, which I expect is one of the 2TB Seagates, it's connected on onboard SATA port #3:
Oct 1 00:20:08 NAS kernel: ata3: SATA link down (SStatus 0 SControl 310)
Oct 1 00:20:08 NAS kernel: ata3: EH complete
Oct 1 00:20:08 NAS kernel: ata3: exception Emask 0x10 SAct 0x0 SErr 0x4000000 action 0xe frozen
Oct 1 00:20:08 NAS kernel: ata3: irq_stat 0x00000040, connection status changed
Oct 1 00:20:08 NAS kernel: ata3: SError: { DevExch }
Oct 1 00:20:08 NAS kernel: ata3: limiting SATA link speed to 1.5 Gbps
Oct 1 00:20:08 NAS kernel: ata3: hard resetting link
Oct 1 00:20:09 NAS kernel: ata3: SATA link down (SStatus 0 SControl 310)
Oct 1 00:20:09 NAS kernel: ata3: EH complete
Oct 1 00:20:10 NAS kernel: ata3: exception Emask 0x10 SAct 0x0 SErr 0x4000000 action 0xe frozen
Oct 1 00:20:10 NAS kernel: ata3: irq_stat 0x00000040, connection status changed
Oct 1 00:20:10 NAS kernel: ata3: SError: { DevExch }
Oct 1 00:20:10 NAS kernel: ata3: limiting SATA link speed to 1.5 Gbps
Oct 1 00:20:10 NAS kernel: ata3: hard resetting link
Oct 1 00:20:11 NAS kernel: ata3: SATA link down (SStatus 0 SControl 310)
Oct 1 00:20:11 NAS kernel: ata3: EH complete
Oct 1 00:20:12 NAS kernel: ata3: exception Emask 0x10 SAct 0x0 SErr 0x4000000 action 0xe frozen
Oct 1 00:20:12 NAS kernel: ata3: irq_stat 0x00000040, connection status changed
Oct 1 00:20:12 NAS kernel: ata3: SError: { DevExch }
Oct 1 00:20:12 NAS kernel: ata3: limiting SATA link speed to 1.5 Gbps
Oct 1 00:20:12 NAS kernel: ata3: hard resetting link
Device is never successfully initialized, the 3 remaining onboard SATA ports report link down, you want to try different cables on those Seagates and check if they are detected by the board bios at startup, if they aren't unRAID won't detected them either.
As for the SAS disks, I assume they are connected to the LSI controller, the controller is detected by unRAID and the driver loaded but there's no attempt to find any disks, also check its bios if the disks are detected, and if it's a RAID controller (or in RAID mode) you may need to create a JBOD or a RAID0 for each disk.