HP Storevirtual 4000 - Network RAID-6 (Dual Parity)

Figure 59 (page 146) illustrates the write patterns on a cluster with four storage systems configured
for Network RAID-5.
Figure 59 Write patterns and parity in Network RAID-5 (Single Parity)
1. Parity for data blocks A, B, C
2. Parity for data blocks D, E, F
3. Parity for data blocks G, H, I
4. Parity for data blocks J, K, L
Network RAID-6 (Dual Parity)
Network RAID-6 divides the data into stripes and adds parity. When using Network RAID 6, the
Network RAID stripe spans five to seven nodes including dual parity. Data in a volume configured
with Network RAID-6 is available and preserved in the event that any two storage systems become
unavailable.
Network RAID-6 volumes are configured as thin provisioned by default.
Best applications for using Network RAID-6 volumes include applications with mostly read, sequential
workloads on larger clusters, such as file shares and archiving.
Figure 60 (page 147) illustrates the write patterns on a cluster with six storage systems configured
for Network RAID-6.
146 Provisioning storage