mdadm is the tried and trusted software RAID tool for Linux. You might think that getting some practice with mdadm is difficult because you need several storage devices. That’s not true as you can simple create some virtual devices to practice on. Here’s how. Create the virtual block devices Use dd to create three 32MB files: dd if=/dev/zero of=disk1 bs=1M count=32 dd if=/dev/zero of=disk2 bs=1M count=32 dd if=/dev/zero of=disk3 bs=1M count=32 Next, map them to loopback block devices usin...
