Connection Types; Direct Connection - Hitachi G1000 User Manual

Connection types

Three types of connections are supported for GAD physical paths: direct,
switch, and channel extenders. You can use Command Suite or CCI to
configure ports and topologies.
Establish bidirectional physical path connections from the primary to the
secondary system and from the secondary to the primary system.
• Direct connection on page 3-6
• Connection using switches on page 3-7
• Connection using channel extenders on page 3-8

Direct connection

With a direct connection, the two storage systems are connected directly to
each other.
Set the ports and topology to Fabric OFF and FC-AL.
You can use the following host mode options to improve response time of
host I/O by improving response time between the storage systems for
distance direct connections (up to 10 km Long Wave) when the open package
is used.
• Host mode option 49 (BB Credit Set Up Option1)
• Host mode option 50 (BB Credit Set Up Option2)
• Host mode option 51 (Round Trip Set Up Option).
For details about host mode options, see the Hitachi Virtual Storage Platform
G1000 Provisioning Guide for Open Systems.
The fabric and topology settings depend on the settings of packages, the
protocol used for the connection between the storage systems, and the
setting of host mode option 51. The link speed that can be specified differs on
each condition either.
3-6
Hitachi Virtual Storage Platform G1000 Global-Active Device User Guide
Planning for global-active device