HP P4000 9.0 HP StorageWorks P4000 SAN Solution User Guide - Page 156
Disk level data protection, Disk protection using RAID, Large single-system SATA cluster
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Page 156 highlights
Disk level data protection Disk level data protection indicates whether the storage system has an appropriate disk RAID level set. For more information about configuring disk RAID levels, see "Planning the RAID configuration" on page 56. Disk protection using RAID Data protection is provided on an individual storage system by configuring RAID at any level other than 0. For a description of RAID levels, see "RAID Levels" on page 54. Large single-system SATA cluster If you are using a single large SATA storage system in a cluster, data protection is provided by configuring RAID 6 on that system. In addition to redundancy during normal operation, RAID 6 further protects the RAID array against data loss during degraded mode by tolerating one additional drive failure during this vulnerable stage. Cluster-level data protection Clusters of two or more systems provide the highest data availability. Clustered storage systems create the storage capacity for data volumes. Clusters are recommended to contain between 2 and 10 storage systems. See "Storage systems in the cluster" on page 153. Volume-level data protection Use a data protection level greater than Network RAID-0 to ensure optimum data availability if a storage system fails. For information about data protection, see "Planning data protection" on page 190. Volume access Use iSCSI load balancing to ensure better performance and better utilization of cluster resources. For more information about iSCSI load balancing, see "iSCSI load balancing" on page 300. Systems running managers Use the recommended number and type of managers to ensure optimum availability of your management group and volumes. Configurations with 3 or 5 managers are recommended for most single site installations. Three or five storage systems running managers is optimum. For fewer storage systems, use a Failover Manager as the third manager if possible. The Virtual Manager is also available for specific configurations. For a detailed discussion of managers and quorum, see "Managers and quorum" on page 149. Network speed and bandwidth Bonding the available NIC cards in each storage system improves SAN performance and reliability. In most instances, Adaptive Load Balancing is the recommended bond. See "Best practices" on page 88. 156 Working with management groups