HP P4000 9.0 HP StorageWorks P4000 Multi-Site HA/DR Solution Pack User Guide - Page 8

Designing a Multi-Site SAN, Configuring data replication for optimal availability and redundancy - best practices

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Designing a Multi-Site SAN The Multi-Site SAN software offers multiple features and the design flexibility to protect against certain types of failures in the environment. Data replication, site design, and quorum managers combine to protect against certain types of failures in the environment. Some of the common types of failures a Multi-Site SAN protects against include data center failures and storage system failures: Data center failures • Site power outage • Site network outage • Site disaster (fire, flood, terrorist attack, and so forth) Individual storage system failures • Power outage • Network outage • System disaster • System failure (backplane, motherboard, RAM, CPU) Configuring data replication for optimal availability and redundancy The SAN/iQ software offers six levels of synchronous replication at a volume level. In order to protect the data across sites, you must choose a data protection level with a number of mirrors that is at least equal to the number of sites in the configuration. For instance, if the storage cluster spans three sites, then volumes must be configured as Network RAID-10+1 in order to insure that data is the same on each site. NOTE: Network RAID-0, Network RAID-5, and Network RAID-6 will not tolerate site failures. Table 1 on page 8 describes the data replication levels for the Multi-Site SAN and associated supported configurations. Table 1 Data protection levels and the supported number of sites Data protection level Network RAID-10 Network RAID-10+1 Number of sites supported 2 3 NOTE: 2 sites are supported, but not considered a best practice configuration Network RAID-10+2 2 NOTE: 3 sites are supported, but are not considered a best practice configuration 8 Designing a Multi-Site SAN

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Designing a Multi-Site SAN
The Multi-Site SAN software offers multiple features and the design flexibility to protect against certain
types of failures in the environment.
Data replication, site design, and quorum managers combine to protect against certain types of
failures in the environment. Some of the common types of failures a Multi-Site SAN protects against
include data center failures and storage system failures:
Data center failures
•
Site power outage
•
Site network outage
•
Site disaster (fire, flood, terrorist attack, and so forth)
Individual storage system failures
•
Power outage
•
Network outage
•
System disaster
•
System failure (backplane, motherboard, RAM, CPU)
Configuring data replication for optimal availability and redundancy
The SAN/iQ software offers six levels of synchronous replication at a volume level. In order to protect
the data across sites, you must choose a data protection level with a number of mirrors that is at least
equal to the number of sites in the configuration. For instance, if the storage cluster spans three sites,
then volumes must be configured as Network RAID
–
10+1 in order to insure that data is the same on
each site.
NOTE:
Network RAID-0, Network RAID-5, and Network RAID-6 will not tolerate site failures.
Table 1
on page 8 describes the data replication levels for the Multi-Site SAN and associated
supported configurations.
Table 1 Data protection levels and the supported number of sites
Number of sites supported
Data protection level
2
Network RAID-10
3
NOTE:
2 sites are supported, but not considered a best practice
configuration
Network RAID
–
10+1
2
NOTE:
3 sites are supported, but are not considered a best practice
configuration
Network RAID
–
10+2
Designing a Multi-Site SAN
8