Help me decide on the Parity size

Hi Unraiders,

Looking for some opinions on what parity size i should upgrade to. My current setup is: 1 x 500gb hdd for parity, 1 x 500gb hdd for storage and a 500gb ssd for cache. i’m at 80% utilisation for my storage so naturally it’s time to upgrade! I primarily use the server for plex and other home automation dockers, so nothing crazy.

My idea is to get a 8tb ironwolf nas drive for the parity and use the old 500gb hdd‘s as the new storage pool for 1tb total usable storage (at least until that gets full then i’ll upgrade those). Is 8tb too much? I‘m thinking more for longevity meaning i wont have to upgrade the parity again.

the alternative would be to get a 4 or 6tb variant for the parity. my limitation is that I only have 4 hdd bays.

any advice is greatly appreciated!