What will happen if you create a raid 0 on two disks of different speed, and with different cache volumes?

Question

System administration

What happens if you create raid 0 on two disks of different speeds and with different cache sizes?
There are two blue WDs and one black WD.
All on 500GB but with a different cache (16,32,64) and speed.
I just want to plug it into the computer and make a software raid 0 to increase the speed.
Fault tolerance is not particularly important to me, but it is very interesting to understand for general development how the cache will be used and what the output speed will be.

Answer 1

Each HDD will use its cache independently. The speed of reading different sectors of the Raid array will be different depending on which HDD the sector is being read from. The overall read/write speed will increase. Fault tolerance in Raid0 will deteriorate, if one disk fails, the entire array will become inoperable.

Answer 2

Increase linear reading speed. The latency will be greater than that of a single fast drive.
The increase in linear read speed is useful when working with large files.
In most other cases - installing an OS, a database, working with small files, there will be no gain.
Regarding the disk cache, it will also be used, for the disk itself there is no difference in the raid or not.
It just writes and reads data on command.

Answer 3

The raid knows nothing about the cache inside the disk, so it doesn't matter, well, the speed of some operations will be higher.
If you need speed, then of course now it's easier than ssd.

Answer 4

https://en.wikipedia.org/wiki/Standard_RAID_levels...