Disable/Remove a drive from cache while the array is started

[WEHA]

I have write errors on a cache drive and now my VM's & Dockers are not responding (just opnsense).

mount|grep cache
/dev/nvme2n1p1 on /mnt/cache type btrfs (ro,noatime,ssd,discard=async,space_cache=v2,subvolid=5,subvol=/)

 

I'm on holiday so I don't want to stop the array to remove the disk.

Is there a way to tell unraid to stop using that disk?

I saw this but it does not seem to be right syntax for unraid: echo 1 > /sys/block/nvme0n1/device/delete

 

Sep 14 07:23:20 Tower kernel: BTRFS error (device nvme2n1p1): error writing primary super block to device 2

 

Label: none  uuid: 987c4458-3b7c-4bbe-af87-c2f8bdde7c60
        Total devices 2 FS bytes used 724.88GiB
        devid    1 size 931.51GiB used 903.54GiB path /dev/nvme2n1p1
        devid    2 size 0 used 0 path /dev/nvme0n1p1 MISSING

 

Sidenote: With errors like these, I would also think that it would give at least an error when I'm looking at the array itself?

 

Would it be a good idea to do the following?

btrfs device remove /dev/nvme0n1p1 /mnt/cache

 

How can I remount rw?

 

Thanks!