I keep getting the same error: the status has once again been shown as ‘DEGRADED’ in my cache pool. The SMART report for both NVMe drives looks fine. Can anyone tell me what’s causing this? The diagnostic report is attached. Thank you very much for your help.

tower-diagnostics-20260529-2210.zip

I have split your post into its own thread since it isn't clear if the OP of that other thread is still using it for his problem. Better to keep things separate so there is no confusion giving advice when data is at risk.

May 29 19:56:25 Tower kernel: nvme nvme0: controller is down; will reset: CSTS=0xffffffff, PCI_STATUS=0xffff

May 29 19:56:25 Tower kernel: nvme nvme0: Does your device have a faulty power saving mode enabled?

May 29 19:56:25 Tower kernel: nvme nvme0: Try "nvme_core.default_ps_max_latency_us=0 pcie_aspm=off pcie_port_pm=off" and report a bug

May 29 19:56:25 Tower kernel: nvme 0000:01:00.0: Unable to change power state from D3cold to D0, device inaccessible

May 29 19:56:25 Tower kernel: nvme nvme0: Disabling device after reset failure: -19

NVMe device is dropping offline, see if this helps: on Main click on the flash drive, scroll down to "Syslinux Configuration", make sure it's set to "menu view" and add this to your default boot option, after "append initrd=/bzroot"

nvme_core.default_ps_max_latency_us=0 pcie_aspm=off pcie_port_pm=off

e.g.:

append initrd=/bzroot nvme_core.default_ps_max_latency_us=0 pcie_aspm=off pcie_port_pm=off

Reboot (or power cycle the server if just a reboot doesn't bring the device back) and then see if it makes a difference.

Thank you very much for your help @JorgeB

Until now, after a reboot, the server would display numerous error messages on the degraded device. However, there was no data loss or issues with my Docker files.

I've now adjusted the default boot options according to your advise and will see if it solves my issues.