RAID & BACKUP(1)

• Not only DBMS, but also OS need to recover and backup

• journal file system, RAID
• Backup DBMS from filesystem?

• RAID:

• 0:stripping(performance increased)
• 1:Mirrored
• 2:Error-Correcting Code
• 3,4:Parity Check，parity disk is bottleneck
• 5:Distribute Parity
• 6:Redundancy