So I added two new SSDs to my cache pool (previosly it was only one SSD) to expand and add redundancy to the pool, but when I tried to format the SSDs to added them, the new SSDs failed. All the SSDs are connected to a 12 port back plane. When I connect one of the new SSDs to the mother board using SATA cable it works and does get formatted correctly but then the second new SSD connected via the backplane fails. The cache pool is zfs pool.

 

star-killer-diagnostics-20231202-1430.zip

1 hour ago, RoustPuppet021 said:

but when I tried to format the SSDs to added them

Not sure I follow, you just add the devices, you don't format them, Unraid does that at array start.

ec  2 04:29:38 Star-Killer kernel: I/O error, dev sdj, sector 0 op 0x3:(DISCARD) flags 0x4000 phys_seg 1 prio class 2
Dec  2 04:29:38 Star-Killer kernel: I/O error, dev sdj, sector 41943035 op 0x3:(DISCARD) flags 0x4000 phys_seg 1 prio class 2
Dec  2 04:29:38 Star-Killer kernel: I/O error, dev sdj, sector 33554428 op 0x3:(DISCARD) flags 0x4000 phys_seg 1 prio class 2
Dec  2 04:29:38 Star-Killer kernel: I/O error, dev sdj, sector 25165821 op 0x3:(DISCARD) flags 0x4000 phys_seg 1 prio class 2
Dec  2 04:29:38 Star-Killer kernel: I/O error, dev sdj, sector 16777214 op 0x3:(DISCARD) flags 0x4000 phys_seg 1 prio class 2
Dec  2 04:29:38 Star-Killer kernel: I/O error, dev sdj, sector 8388607 op 0x3:(DISCARD) flags 0x4000 phys_seg 1 prio class 2

Looks like a power/connection issue with this device, check/replace cables and post new diags.