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Why do you want to do this? What is your plan for your new configuration?

But if you have a modular PSU, you must use cables for that specific PSU. There is no standard pinout for modular PSU. Don't fry your drives by using a wrong cable.

Apr 26 22:33:36 dachora webgui: File_put_contents_atomic failed to write / rename /mnt/cache/1232932549.tmp Apr 26 22:33:36 dachora root: Fix Common Problems: Error: Unable to write to cacheFCP can't write to it too, didn't you get notified that your cache was unwritable?

Click the FIX button, post the output

Check filesystem on disk19 from the webUI and post the output.

Check filesystem on disk5 from the webUI and post the output.

Disable Docker and VM Manager in Settings. Boot in SAFE mode. See if it still has problems like that.

Only one would need to fail for memory to be bad so how likely it is all 4 are failing doesn't matter.

The config folder from flash is all you need to get your configuration going again on a new install. Power off, put your boot flash in your PC, copy the config folder. Create a new install on that same flash drive and copy your config folder back to it.

Do you have a current flash backup?

Did you have unclean shutdown before that previous parity check?

What advice on which page?

Apr 24 21:06:20 QSC kernel: mdcmd (36): check nocorrectUntil you run a correcting parity check you will continue to get those same sync errors.

How are the drives powered? Any splitters? Ideally no more than 4 drives per PSU cable.

https://docs.unraid.net/unraid-os/using-unraid-to/manage-storage/file-systems/

SSDs in the parity array cannot be trimmed. You can have multiple multidisk zfs or btrfs pools outside the array. The Unraid parity array is not required. All pools are part of user shares.

Haven't used this new plugin myself but I am familiar with par2, which is how usenet binaries (nzb) are able to be reconstructed from incomplete data.

How are you accessing the command line?

Of course not. It is impossible to move to slow array as fast as you can write to fast cache. Mover is intended for idle time.

Probably simpler to search the docs themselves since any forum links may be outdated.

https://docs.unraid.net/unraid-os/using-unraid-to/manage-storage/array/replacing-disks-in-array/#re-enabling-a-disabled-disk-rebuilding-onto-itself

That would be a start. You will have to rebuild disk11 of course. Emulated disk11 is mounted so should be OK to rebuild on top.

Maybe something about your settings is the cause. Attach Diagnostics ZIP to your NEXT post in this thread.

How could you do "both" when you only have one?

I didn't examine SMART for any other disks since you have so many. Do any show SMART warning (👎) on the DASHBOARD page? Rebuild will start over if you restart, so probably better if you just shutdown and wait. You can rebuild both at the same time. Rebuilding to spares does give other options in case of problems. My home office is undergoing some remodel currently, so I have moved my server to another room where I already have ethernet. Don't know if that is an option for you.