HP LeftHand P4000 Virtual SAN Appliance Software - Manual (Page 145)

Best applications for Network RAID-10+1 are those that require data availability even if two storage
systems in a cluster become unavailable.
Figure 59 (page 145) illustrates the write patterns on a cluster with four storage systems configured
for Network RAID-10+1.
Figure 59 Write patterns in Network RAID-10+1 (3-Way Mirror)
Network RAID-10+2 (4-Way Mirror)
Network RAID-10+2 data is striped and mirrored across four or more storage systems. Data in a
volume configured with Network RAID-10+2 is preserved in the event that any three storage systems
become unavailable. Network RAID-10+2 is designed for Multi-Site SANs to preserve data in the
event of an entire site becoming unavailable.
Best use for Network RAID-10+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-10+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 60 (page 145) illustrates the write patterns on a cluster with four storage systems configured
for Network RAID-10+2.
Figure 60 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