Again: Redis is a database, not just a cache - it doesn’t care if you store ephemeral cache artifacts or customer records within it. Redis doesn’t pose any constraints on the type of data. Inversely, you can use Postgres as a semi or fully consistent cache.
And yes, what you’re saying is technically correct, even a well-tuned single node doesn’t solve the availability problem: if it goes down, you have an outage. To avoid that, you need multiple instances to provide the same data, avoiding downtime if one of the nodes breaks eventually.
> doesn’t pose any constraints on the type of data.
logic, raw disk is also a database. One just need to add block level replication to other nodes to build a replicated/ HA database.
We may not agree, but anything not providing transactions across logically related multiple data read/ update operations is not a database.
> multiple instances to provide the same data
is easy and done by a bunch of software out there, but
> multiple instances to provide the same data on non-shared memory computers, with consistency
is a really hard problem, and no one has been able to solve it yet without introducing other problems to be considered (giving up on fast performance being one of the most visible one) by architects/ developers.
And yes, what you’re saying is technically correct, even a well-tuned single node doesn’t solve the availability problem: if it goes down, you have an outage. To avoid that, you need multiple instances to provide the same data, avoiding downtime if one of the nodes breaks eventually.