1. You are given 6 data blocks, 3 parity blocks (assuming a parity bit is computed over every 2 data bits), and 3 disks. If RAID 5 is used, please decide the layout of data and parity blocks on these disks.
2. Please explain which RAID level you will use for the following applications:
a. A stock trading system. Many transactions (read and write) are running at the same time and it is crucial not to lose any information.
b. A system for managers to analyze sales. The data only gets updated once a day.
c. A video database for people to watch video online. The database has a backup.