So, a lot of database systems aren't using EBS for many reasons: that's why the local I/O instances exist. And so, yes: you don't build out like that unless but

So, a lot of database systems aren't using EBS for many reasons: that's why the local I/O instances exist. And so, yes: you don't build out like that unless but you are prepared to just scrap the instance and rebuild it from WAL logs or have replication or whatever, but knowing "this is a 30 second fix with a serial console" really makes taking all of that cost in stride painful.