[Help] Volume and storage pool no longer visible from TOS - slow and degraded Nas [SOLVED]

[Cis]

Update:

Here is my current situation:
- I have unplugged the second disk of my raid 1 to ease operations (It s no longer sync needs to be repaired anyhow, taking the risk to repair later once TOS is back to normal speed)
- Despites system slowness and sporadic TOS timeouts, I managed to update TOS to 5.1.145, restarted NAS once after first OS boot.

-> it is not really better, still system is slow or sluggish often and TOS cannot dispplay properly my Disk details, showing no data.. Accessing through SSH I can access my data, things are slow if I try to copy anything, and some utilities are not working, like docker and docker compose are no longer deployed/usable.. it looks like the OS is broken or super slow to finish install..

I have noticed several threads in forum stating slowness on TOS 5 and requiring action from TOS support, I dont see what else I could do at this stage..

@TM support could you please give recommendation what best to proceed with?

[TMzethar]

Regarding this issue, verbal descriptions alone cannot fully convey the situation. Please contact the technical support team to investigate the problem. First, provide a system report (TOS > Technical Support > Report Issues). If necessary, we can arrange for a remote investigation.
If you can't send the zip package because it's too big, you can delete the following folders of the zip package to reduce the size.
etc>tos>scripts
etc>udev
etc>init.d

[TMzethar]

Upon examination of the system report, it was ultimately determined that a particular HDD exhibited read/write errors and physical bad sectors.