Hello, I understand the basics of RAID. e.g. RAID 5 - one drive capacity loss for parity, RAID 6 - 2 drives parity.
What I’m trying to understand is how much usable space you actually end up with after everything is taken into account.
I’ve read that you don’t get the full RAID capacity because some space is reserved by the file system, and in some discussions people mentioned losing around 10% or even more. I also wasn’t sure whether UGOS stores any of its own data on the storage pool ( or is it stored on the internal memory completely ? )
For example, if I create a storage pool using a single 1TB SSD, how much usable space should I realistically expect to see after the pool is created?
Is there a calculator or an official document that shows the expected usable capacity for different drive sizes and RAID configurations? I’d like to know what to expect before buying my drives.
As always, when you format a drive, you lose a chunk of the raw capacity.
I have a pair of 20 TB drives in RAID 1 and I get 18.1 GB after formatting in ext4.
None of the RAID calculators take file systems into account. Just search for RAID calculator and you’ll get a bunch of options to try.
Ugos doesn’t install anything on your hard drives, that’s what the OS SSD (or eMMC) is for, but of course, if you install any software, it’ll either be on your hard drives, or on a separate SSD if you install one. I have all my software installed on an SSD, as it runs better that way.
Also, I wouldn’t recommend RAID 5 or 6 if you go with anything larger than 8 TB drives, as the rebuild time in case of a failure will be way too long and it might in turn cause other drives to fail due to the stress that’s being put on the drives after a few years in use. Sadly Ugreen doesn’t have support for more modern RAID implementations, but it might come down the road.