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Just one simple question: what figures (MB/s) would make you happy on a decent VPS and what would you consider unacceptable? Or, in other terms: what do you expect when you rent a VPS which claims to use SSD?
Depends how much I paid.
It depends of the usage. if disk can load/save all the webserver, database, app server, etc, needs in peak moments without being bottleneck then it's ok. Nowdays even regular SSD is more than enough for most of the tasks. 50-100Mb/sec is plenty for me as my data is quite compact in size. for 18 Mb/s I'd open a ticket. If the system is constantly writes huge amount of data to ssd then it's often a design flaw and a big problem for a provider who must detect such tenants. I guess this is why the free and even $20 pro Cloudflare accounts with sporadical visits are washed fast from edge memory cache and not even allowed to be saved to ssd cache and have lots of cache misses. Nowdays I use CF only for DNS which is still working okay
As long as I don't notice a slowdown it is good. Honestly, I haven't felt any difference between SSD and NVMe until I benchmark.
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I expect little-to-no iowait, I don't worry so much about raw numbers. Transfer rates are well and good, but IOPs and latency matter more generally.
iowait tells us how much time the system spends just waiting on disk - as long as that's below ~5%, I'm happy
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Very roughly guessing I'd say $/mo x 25 [MB/s]
There isn't really a solid number, as it just depends on too much. You need to consider IOPs, Type of Drive (Mechanical or not, as well as type of drive; m.2 / PCIe, or SATA). Then you also need to consider RAID types; RAID 0 / RAID 5 / RAID 10 improving speed. Also, how much you're paying for the amount storage you get.
To be honest, I'm more than happy with anything above 100Mb/s, but it also depends on what I'm using my server for; gameservers will need fast storage, but if I'm using my server something else it wont matter as much.