How to expand a RAID array?

Question

linux

There is RAID0, assembled from two RAID1, each of which is assembled from four disks. The whole thing is hosted on AWS, EBS disks. Actually, the idea was what, in turn, pull out a disk from the array, disconnect them from the server, connect a larger disk instead, wait until it is synchronized, and so on. However, the size still remains paramount. Actually, the question is, is it possible to somehow increase the arrays in such a way as to end up with an increased RAID0? It's on an Ubuntu 13.10 server.

Answer 1

First tell mdadm that the size of the disks has increased.
Then notify the file system of the increase -- ex2/ext3/ext4 needs the resize2fs utility.
Read more here

Answer 2

It seemed to me that since the advent of fast disks, Amazon did not need such a scheme.
Why the hell do you need so many disks in a raid?