I am running the latest version of unraid and have 5 drives in my array 3-2 terabyte and 2-3 terabyte all data all running reiserfs the 2 terabyte drives are full within 500 megs of being so the 3 terabyte drives are empty Just added them to the array. Question How dangerous would it be to leave it reiserfs. Because it would be a pain to convert it and alot of time doing it. If I must convert the drives tell me now cause now is the time before I start filling them. I have had no problems with the file system but I am looking long term.

 

Thanks 

I wouldn't say it's dangerous but most prefer to use xfs, reiser it's on the way out and it's not being actively developed and in certain cases has much worse performance.

There is a sticky on moving from rfs to xfs that points you to a very detailed set of instructions. People with much larger arrays than you have done it. With your array size, it really will be pretty quick. With 2 empty 3T disks and 2 full 2T disks. I would say you are in the perfect position to do the conversion now.

 

I'd start immediately by reformatting the 2  empty 3T to xfs. Absolutely no reason to use RFS on them if they are new. Did you specifically configure unRaid to use RFS? If not XFS is the default so they have already be XFS. The web gui will show you.