Supported data path configurations
Three configurations are supported for TrueCopy:
• Direct connection on page 3-29
• Switch connection on page 3-30
•
Extender connection on page 3-32
You can use the GUI (Device Manager - Storage Navigator or Hitachi
Command Suite) or the CLI (Command Control Interface) to set ports and
topology.
For direct and switch connections, host I/O response time can be improved
on long-distance direct connections (longwave, less than 10 km/6.2 miles) by
improving the I/O response time between storage systems and by using host
mode options (HMOs) 49 and 50, or HMO 51. The following table describes
these options. A Hitachi Data Systems-approved channel extender is
required. For details about HMOs, see the Provisioning Guide for Hitachi
Virtual Storage Platform Gx00 and Fx00 Models.
HMO Title Description
49 BB Credit Set Up
Option 1
Fixes higher values of buffer-to-buffer credits (BBCs) to
increase data transfer size over long distances.
1
This
host mode option must be used in conjunction with host
mode option 50.
2
50 BB Credit Set Up
Option 2
Fixes higher values of buffer-to-buffer credits (BBCs) to
increase data transfer size over long distances.
1
This
host mode option must be used in conjunction with host
mode option 49.
2
51 Round Trip Set
Up Option
Improves host I/O response time for long distance switch
connections.
2
Notes:
1. Up to 10 km for direct connection and 100 km for switch connection.
2. The firmware supporting these functions must be installed on both the primary and
secondary systems.
Direct connection
The following figure shows a direct connection, in which two devices are
connected directly together.
Planning for TrueCopy
3-29
Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models
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