I am currently running my homeserver with 2 TB disks in RAID-0. I am running out of space and I will soon migrate it to a RAID-5, throwing in an additional 2 TB drive (all the data on the current drives will be transferred somewhere else, so basically I'll be creating a RAID-5 array from scratch).
Eventually I will run out of space once again, and I'll have to expand the array.
I have found this guide
that explains a simple way to expand a RAID-5 array, but I have a question about that: if I add another drive in such way, will I lose redundancy? If I understand correctly, RAID-5 calculates parity data that will allow it to run even if one of the 3 drives is broken, but what happens if you have more than 3 drives?
I experimented a little in a VM and it seems that it works fine, even disconnecting one (virtual) drive from the VM.
Thanks in advance for your help.