Is it possible to combine disks into a Raid array?

Question

ubuntu

There is a server with two ssd disks (256gb) combined in raid-1 to provide higher read speed. Such disk space was not enough for current tasks.
There are database files on the disk, which, as I understand it, cannot be divided into different folders.
We plan to buy a couple more of these ssds. Is it possible to connect these disks to an existing volume in order to increase its volume? And how to do it?
If I understand correctly, then there will be two raid-1 arrays combined into raid-0 (it turns out raid-10)?
Maybe I missed something?

Answer 1

Such manipulations require saving all the information, changing the RAID array and uploading the information to the new array.

Answer 2

Reading speed from SSD - 500MB/s. RAID 0 of 2 disks - 1000MB/s
Theoretical throughput of SATA III interface - 6Gb/s = 750MB/s
Fault tolerance RAID0 = 0
.
Or do you want the lowest latency? Response time?