Volume sharing over Lan

Would be nice to create a raid-5 over lan.

For example:

pc 1: Disk 1 for os

pc 1: Disk 2 free

pc 2: Disk 1 for os

pc 2: Disk 2 free

pc 3: Disk 1 for os

pc 3: Disk 2 free

Would be possible to create 1 raid-5 drive from the 3 extra disks and create one disk you can share.