Disk Level Data Protection; Disk Protection Using Raid; Large Single-System Sata Cluster; Cluster-Level Data Protection - HP StorageWorks P4000 User Manual

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
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

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

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

Volume access

Use iSCSI load balancing to ensure better performance and better utilization of cluster resources. For
more information about iSCSI load balancing, see

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
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
practices" on page 88.
156 Working with management groups
"RAID
"Storage systems in the cluster" on page 153.
"Planning the RAID
Levels" on page 54.
"Planning data
"iSCSI load balancing" on page 300.
protection" on page 190.
"Managers and
"Best