RAID and Subsystem Architectures
RAID Configurations
RAID 6 - Protection
This is still a RAID 5 Stripe set.
We can write securely while the hot spare
rebuilds. Then we can recreate the RAID 6 set
Block C1 Block C2 Parity Block C3 Parity
Block B4 Block B5 Block B6 Parity
Parity Block B1 Block B2
Parity Parity Block A7
X
Parity
Parity Block B3
Block A8 Block A9
Block A4 Parity Parity Block A5 Block A6
Block A1 Block A2 Block A3 Parity Parity
RAID 6 (block striping with double distributed parity):
When a single disk fails we still have a RAID 5 set. We can continue
writing our data in the knowledge it is protected. Data that is written
during rebuild time will need to be converted from RAID 5 to RAID 6
after the initial rebuild is complete