Planning Physical Paths; Determining The Required Bandwidth - Hitachi G1000 User Manual

from the primary system. Normally in this case you use paths between the
primary server and primary system and paths between the secondary server
and secondary system. If a failure occurs in a path used in normal
circumstances, you will use the paths between the primary server and
secondary system, and paths between the secondary server and primary
system.
After you incorporate the VSP G1000 settings to HDLM, the attribute of the
HDLM path to which host mode option 78 was set changes to non-owner
path. If host mode option 78 is not set to the path, the HDLM path attribute
changes to owner path.
Related topics
• Planning system performance on page 3-3

Planning physical paths

When configuring physical paths to connect the storage systems at the
primary and secondary sites, make sure that the paths can handle all of the
data that could be transferred to the primary and secondary volumes under
all circumstances. Review the information in the following sections when
planning physical paths:
• Determining the required bandwidth on page 3-4
• Fibre-Channel connections on page 3-5
• Connection types on page 3-6

Determining the required bandwidth

You must have sufficient bandwidth to handle all data transfers at all
workload levels. The amount of required bandwidth depends on the amount
of server I/O to the primary volumes. To identify the required bandwidth, you
3-4
Hitachi Virtual Storage Platform G1000 Global-Active Device User Guide
Planning for global-active device