Data Domain Gateway Systems
31
Hardware Interfaces
External Disks
The external physical disks that provide storage to the gateway should be dedicated to the gateway
and not shared with other hosts.
A volume on the gateway system may use any of the disk types supported on the disk array.
However, only one disk type can be used for all Logical Unit Numbers (LUNs) in the volume to
assure equal performance for all LUNs.
All disks in the LUNs must be like drives in identical RAID configurations.
Replication
For replication between a Data Domain Gateway system and other model Data Domain systems,
the total amount of storage to be replicated on the originator must not exceed the total amount of
storage on the destination.
Replication between Data Domain Gateway systems must use storage arrays with similar
performance characteristics. The size of destination storage must be equal to or greater than the size
of source storage. Configurations do not need to be identical.
Fibre Channel Host Bus Adapters
A Fibre Channel Host Bus Adapter (HBA) in the Data Domain system communicates with the
external disk array.
DD460g and DD560g Data Domain systems use a single HBA (with up to two ports) in slot 2 of
the PCI card array.
DD580g Data Domain systems using DD OS 4.4.x or later can have up to two dual-port HBAs with
the first in slot 4 and the second in slot 3 of the PCI card array. For card locations, refer to the
chapter that describes your Data Domain System.
Multipath (Failover) Support
All Data Domain systems with DD OS 4.4.x or later support Fibre Channel multipathing. Models
with earlier DD OS releases do not support multipathing.
