raid 5 parity check

Hi,

I want to set up a software raid 5 system on Red Hat 8.
Although I believe the parity data is computed correctly initially,
I wonder how one can make sure the parity data will be always correct.

1) Is there a utility to allow me to check parity routinley?

2) How are the parity block redistributed
when you add another disk to raid 5 system?

Thank you in advance for any advice,

Mira
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