HP P4000 9.0 HP StorageWorks P4000 SAN Solution User Guide - Page 192
How data protection levels work, Network RAID–10 (2–Way Mirror), When you choose Network RAID-10
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With this number of available storage systems in cluster At least 6 Select any of these data protection levels For this number of copies • Network RAID-0 (None) • Network RAID-10 • Network RAID-10+1 (3-Way Mirror) • Network RAID-10+1 (4-Way Mirror) • Network RAID-5 (Single Parity) • Network RAID-6 (Dual Parity) • One copy of data in the cluster. • Two copies of data in the cluster. • Three copies of data in the cluster. • Four copies of data in the cluster. • Data striped on three storage systems and parity stored on fourth storage system. • Data striped on four storage systems and parity stored on fifth and sixth storage systems. How data protection levels work The system calculates the actual amount of storage resources needed for all data protection levels. When you choose Network RAID-10, Network RAID-10+1, or Network RAID-10+2, data is striped and mirrored across either two, three, or four adjacent storage systems in the cluster. When you choose Network RAID-5, data is striped across three storage systems, and parity is stored on the fourth system. When using Network RAID-6, data is striped across four storage systems, and parity is stored on the two remaining systems. CAUTION: A management group with two storage systems and a Failover Manager is the minimum configuration for automated fault tolerant operation. Although the SAN/iQ software allows you to configure Network RAID-10 on two storage systems, this does not guarantee data availability in the event that one storage system becomes unavailable, due to the communication requirements between managers. See "Managers overview" on page 149. CAUTION: Any volume with Network RAID-0 is not protected from complete system failure or reboot. Network RAID-10 (2-Way Mirror) Network RAID-10 data is striped and mirrored across two storage systems. Network RAID-10 is the default data protection level assigned when creating a volume, as long as there are two or more storage systems in the cluster. Data in a volume configured with Network RAID-10 is available and preserved in the event that one storage system becomes unavailable. Network RAID-10 is generally the best choice for applications that write to the volume frequently and don't need to tolerate multiple storage system failures. Such applications include databases, email, and server virtualization. Network RAID-10 is also good for Multi-Site SANs. Using Network RAID-10 in a Multi-Site SAN ensures that data remains available in the event that one site becomes unavailable. However, if one site does go down, the Network RAID-10 volumes are then not protected from complete system failure or reboot. 192 Provisioning storage