HP LeftHand P4000 Virtual SAN Appliance Software - Manual (Page 113)

Figure 49 Best Practice Summary for well-configured SAN
Expand the management group in the summary to see the individual categories that have
recommended best practices. The summary displays the status of each category and identifies any
conditions that fall outside the best practice. Click on a row to see details about that item's best
practice.
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”
(page 34) .
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” (page 32) .
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.
Disk RAID Consistency
The best results for availability, reliability, and performance are achieved by using the same disk
RAID level for all storage systems in a cluster. Mixed RAID levels in clusters are allowed to support
a variety of administrative tasks. However, using the same RAID settings on all storage systems in
a cluster ensures optimum availability and performance. For more information, see
“Managers
overview” (page 107) .
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” (page 111) .
Best Practice summary overview 113