Please help i can only mount the pool as read only

I would start with providing more info on your hardware, software and what may have led to this problem. Did you do anything to cause a disk to be ‘removing’

https://forums.truenas.com/t/joes-rules-to-asking-for-help/12740

Stripe pool, so any drive failure is fatal. Do you have a backup?
If not, go and buy enough extra storage to make one.

The drive has not failed though when I mount the pool as read only I can transfer data out.

Then I would advise that you do a full backup right now.

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