I'm sure there are reasons for using Unraid but the original funky raid alternative they marketed has always struck me as extremely fishy. The kind of solution developed by folks who didn't know enough about the best practices in storage and decided to roll their own. I guess people like web interfaces too. Personally I'd never use it. Get Debian Stable or Ubuntu LTS, learn some Docker, Ansible and Prometheus, deploy and never touch until you break it or the hardware breaks. Throw Webmin on it if you like dancing bears too.
Not everyone interested in self-hosting stuff has the time or is even interested in diving much deeper into it than necessary. That‘s why QNAP and Synology also offer value to homelabers.
Coming from Synology, where I had learned much about docker and CLI, Unraid was the perfect next step for me to get rid of my Sonology‘s shortcomings. And I figure, it won‘t need anything beyond that in the future for me. I‘ve been successfully running quite a lot of services for the whole family being supported by a sufficient GUI and very limited need for CLI.
Yeah, I guess that's the niche. I would still not trust their homegrown raid scheme though. Making storage systems that don't eat data is hard. Making it without bugs is impossible. Bugs are found by having someone's data eaten and fixed over time scaled by the size of the userbase. As a result industry standard systems like mdraid, LVM, ZFS, and more recently Btrfs used in data centers and production applications are statistically guaranteed to eat less data than Unraid's homegrown solution. I've heard it now supports those systems too so if I had to use Unraid, I'd probably be using ZFS for the storage.
The draw to me was always that you could do a RAID without needing every disk to be the same size. Parity drives just had to be the size of the largest disk in the array.
I had been thinking about buying a license previously, when it was still "lifetime." Now I'm skeptical and probably won't although good for the people who got grandfathered in to free updates, though. However, I would question how long that lasts before they're un-grandfathered-in and have to start paying for updates like everyone else.
Yeah, I've read about that but I couldn't buy it because you could achieve similar results with LVM, ZFS etc. albeit with a bit more thought. For example I used to have a mirror (RAID1) comprised of 1TB, 3TB, 4TB and an 8TB disks. The 1, 3 and 4TB disks were concatenated in an 8TB linear volume (JBOD) and then that was mirrored with the 8TB disk (RAID1). All using standard battle tested software - LVM, mdraid and Ext4. I got 8TB usable from it. I'd have gotten the same in Unraid. The redundancy was equivalent too. With ZFS things are even simpler. Build whatever redundant scheme you have disks for. Use whatever redundancy scheme makes sense for those disks. You could combine multiple schemes. E.g. 1TB + 1TB mirror and a RAIDz1 with 3x 3TB disks, all adding to 7TB of nice contiguous usable space with all the data integrity guarantees of ZFS. Heck if you need to do some 3-disks-in-a-trenchcoat trickery to utilize your obsolete hardware like I did, you can use LVM for that and give it to ZFS to use. When you're ready to expand, buy disks for whatever redundancy scheme you like and just add it to your ZFS pool. No fuss. You like living dangerously? Add disks without redundancy. Can't afford redundancy now but you'd like it later? Add disks without redundancy now, add redundancy later.
Unraid can use randomly sized disks, and allows expansion of an array by adding more disks. Something that traditional RAID doesn't do.
It's more like Synology but on your own hardware, much more user friendly for people that don't have the experience (or time) to set it up the hard way.
Not sure how traditional-traditional (hw RAID?) you're referring to but you can use different disk sizes as well as grow LVM/mdraid or ZFS. It does indeed require a bit more thought and reading to do well. On the upside it's probably much safer (for data integrity) and more performant.
Than Unraid or DIY? I've considered SCALE but I've never used it. I know they use ZFS so it will almost certainly eat less data than Unraid's homegrown raid.
I may be misreading your post, but it seems like your argument against Unraid is that they "rolled their own" which is why you'd never use it and instead "roll your own"?
don't implement your own storage redundancy system at the kernel level with a small team in a closed-source fashion, because that's the kind of thing that needs many eyes, lots of experience and many millions of hours real-world usage to fully debug and make sure it work.
do build your own system by combining pre-existing technologies that are built by experienced teams and tested/vetted by wide/popular usage.
I feel OPs critique has some truth to it. I personally would rather stay with raidz by zfs, exactly because of it's open nature (yes, they too have bugs, nothing is perfect).
It's much simpler/easier to use, and supports expanding storage by adding more drives. More like your typical user friendly NAS like Synology.
TrueNAS can give you almost the same end result (minus being able to expand storage easily), but just takes a lot more experience and knowledge to pull it off.
Unraid uses a very simplistic scheme where you throw together a bunch of drives and one parity drive. The parity drive needs to be as big as the largest normal drive and holds recovery checksums for all the other.
Basically you can lose any one disk and still be able to recover the data, and the disks don't have to be the same size.
You can achieve the same with snapraid + mergerfs if you want.
TrueNAS uses distributed parity schemes so it has same size requirements, but it also protects against bitrot and has other extra features.
Also posted it because unraid is not moving solely to annual subscriptions as your title and others have indicated. Previous pro and other fully included lifetime subs are just increasing in price and a lower tier is coming in to place.
By the way, you can still buy the old licenses, which will be grandfathered in, and they will keep the old license upgrade paths too (Basic -> Plus -> Pro), so now may be a good time to grab a Basic license if you think you might want a lifetime Basic, Plus or Pro license in the future.