Hitachi Unified Storage VM, Product Overview Manual

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Hitachi Unified Storage VM Product Overview Guide
3–10
Software overview
Block replication and SyncDR
Depending on the disk technology being used, Hitachi NAS system software
also supports specific block-based replication options available at the
Hitachi storage controller level (synchronous or asynchronous). Dark fiber
connections between controller pairs are required for controller mirroring;
depending on class of hardware and features selected, replication distances
can range from 500m to 10km. Through the use of advanced fiber-optic
wavelength-division multiplexing technologies, this range can be
considerably extended to 100km or more.
Backup features
Backup services seek to achieve a copy of the data at a specific point in
time, usually for off-line preservation. As with replication, the Hitachi File
System leverages snapshots to allow the storage administrator to perform
backups while continuing to serve data to hosts with the live file system.
The Hitachi NAS server supports LAN-free backup of data using either Fibre
Channel or Ethernet networks and dedicated connections with dedicated
bandwidth. This separation allows the live file system to continue serving
data to hosts unimpeded by the backup operations.