You can use the following host mode options to improve response time of
host I/O by improving response time between the storage systems when
switches are used for distance connections (up to 100 km) and 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 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, and
protocol used for the connection between storage systems, and the host
mode option (HMO) 51 setting. The link speed that can be specified differs on
each condition either.
Package
name
Protocol
Setting of
the HMO 51
Setting of
the fabric
Topology of
the Initiator
port and the
RCU Target
port
Link speed
that can be
specified
16FC8 8GbpsFC OFF ON Point-to-Point • 2 Gbps
• 4 Gbps
• 8 Gbps
16FC8 8GbpsFC ON ON Point-to-Point • 2 Gbps
• 4 Gbps
• 8 Gbps
Related topics
• Connection types on page 3-6
Connection using channel extenders
Channel extenders and switches should be used for long-distance
connections.
3-8
Planning for global-active device
Hitachi Virtual Storage Platform G1000 Global-Active Device User Guide
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