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HPE StoreVirtual Multi-Site SAN design
The Multi-Site SAN feature enables you to mirror data synchronously between logical or physical sites
automatically. You create a Multi-Site SAN by configuring equal numbers of storage systems to create
isolated failure domains. You creat a MULti-SITE SAN by configuring equal numbers of storage controllers
into sites.
Sites for a Multi-Site SAN can be geographically disparate, such as a primary data site and a back-up site in
another building or on another campus. Sites can exist within the same building on different floors or in
different labs on the same floor. Sites can be two different racks in the same server room or even two groups
of storage systems in the same rack.
Multi-Site SAN features
Multi-Site allows storage controllers to be divided evenly between different sites.
Multi-Site is supported with StoreVirtual OS 13.5 and later.
The Multi-Site SAN feature enables:
•
Multi-Site clusters that span two sites for synchronous data replication.
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Geographical awareness, by designating storage systems as members of a particular site.
•
Synchronously replicated (mirrored) data between sites, based on volume data protection level.
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Site information that ensures that data is mirrored between sites for high availability and disaster recovery.
•
I/O path optimization by assigning application servers to connect to storage systems located in the same
site (site preferencing), causing local reads with only replicated writes between sites.
•
Failover Manager support for automatic failover/failback in a two-site configuration without requiring a
physical storage system in a third site.
•
Failover Manager for quorum management if the network connection between two sites becomes
unavailable.
•
Failure protection through data replication, site design, and quorum managers. A Multi-Site SAN can
protect against data center failures (power or network outages or a natural disaster) and individual storage
system failures (power or network outages, a system disaster, or a system component failure).
For operation information, see the HPE StoreVirtual Management Console User Guide.
Design considerations for a Multi-Site SAN
•
Network design—Good network design is a critical part of configuring a Multi-Site SAN to ensure
reliability, high availability, and performance. Typical Multi-Site SAN configurations comprise two sites for
StoreVirtual 3200 storage and support multiple network designs.
•
Data replication level—To protect the data across sites, you must choose a data protection level. The
data protection level must have a number of mirrors that is equal to the number of sites in the
configuration. For example, two site configurations require volumes to use Network RAID 10 to survive a
single site failure.
•
Managers and quorum—You must also correctly configure the SAN managers for quorum to ensure that
if a failure occurs the system can be properly recovered. Maintaining quorum can be either an automated
process using a Failover manager or manually recovered by an Administrator using a Virtual Manager.
Designing the network for the Multi-Site SAN
Design best practices
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HPE StoreVirtual Multi-Site SAN design
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