Imagine a server with all your company data. 500GB, 1TB, 1.5TB, 2TB of data storage. And now imagine your server’s HD suddenly broke. I thing it will be a collapse, mainly if you don’t had a backup. For that sceneries and others was created the RAID 1.
If you want to learn more about RAID and all of your types, checkout the Wikipedia (https://en.wikipedia.org/wiki/RAID).
From Wikipedia about RAID1:
RAID 1 consists of data mirroring, without parity or striping. Data is written identically to two (or more) drives, thereby producing a “mirrored set” of drives.
Thus, any read request can be serviced by any drive in the set. If a request is broadcast to every drive in the set, it can be serviced by the drive that accesses the data first (depending on its seek time and rotational latency), improving performance. Sustained read throughput, if the controller or software is optimized for it, approaches the sum of throughputs of every drive in the set, just as for RAID 0.
Actual read throughput of most RAID 1 implementations is slower than the fastest drive. Write throughput is always slower because every drive must be updated, and the slowest drive limits the write performance. The array continues to operate as long as at least one drive is functioning.
Now, let’s go to the lesson! Open your VMware or Virtual Box and create a new VM with Ubuntu Server!
Any question, just leave your comment below! ^^
Credits and References
Installation/SoftwareRAID. Ubuntu Documentation: