Network Raid- 1 0+2 (4-Way Mirror); Network Raid-5 (Single Parity) - HP StoreVirtual 4000 User Manual

Best applications for Network RAID- 1 0+1 are those that require data availability even if two storage
systems in a cluster become unavailable.
Figure 57 (page 145) illustrates the write patterns on a cluster with four storage systems configured
for Network RAID- 1 0+1.
Figure 57 Write patterns in Network RAID-10+1 (3-Way Mirror)

Network RAID- 1 0+2 (4-Way Mirror)

Network RAID- 1 0+2 data is striped and mirrored across four or more storage systems. Data in a
volume configured with Network RAID- 1 0+2 is preserved in the event that any three storage systems
become unavailable. Network RAID- 1 0+2 is designed for Multi-Site SANs to preserve data in the
event of an entire site becoming unavailable.
Best use for Network RAID- 1 0+2 volumes is for data that must be synchronously replicated between
two locations and that must remain fully redundant in the case of an entire site failure. Using
Network RAID- 1 0+2 ensures that data remains available after half of the SAN is unavailable, and
continues to remain available even with the loss of a single storage system in the remaining site.
Figure 58 (page 145) illustrates the write patterns on a cluster with four storage systems configured
for Network RAID- 1 0+2.
Figure 58 Write patterns in Network RAID-10+2 (4-Way Mirror)

Network RAID-5 (Single Parity)

Network RAID-5 divides the data into stripes and adds parity. Network RAID stripe spans three to
five storage systems including single parity. Data in a volume configured with Network RAID-5 is
available and preserved in the event that any single storage system becomes unavailable.
Network RAID-5 volumes are configured as thin provisioned by default.
Best applications for using Network RAID-5 volumes include applications with mostly read, sequential
workloads, such as file shares and archiving.
Provisioning volumes 145