542 Implementing the IBM Storwize V7000 with IBM Spectrum Virtualize V8.2.1
Other configuration commands are permitted even though the systems are disconnected. The 
state is reconciled automatically by MM/GM when the systems become connected again.
For any command (with one exception), a single system receives the command from the 
administrator. This design is significant for defining the context for a CreateRelationship 
mkrcrelationship or CreateConsistencyGroup mkrcconsistgrp command. In this case, the 
system that is receiving the command is called the local system.
The exception is a command that sets systems into a MM/GM partnership. The 
mkfcpartnership and mkippartnership commands must be issued on both the local and 
remote systems.
The commands in this section are described as an abstract command set, and are 
implemented by either of the following methods:
/SM590000CLI can be used for scripting and automation.
/SM590000GUI can be used for one-off tasks.
11.7.2  Listing available system partners
Use the lspartnershipcandidate command to list the systems that are available for setting 
up a two-system partnership. This command is a prerequisite for creating MM/GM 
relationships.
11.7.3  Changing the system parameters
When you want to change system parameters specific to any remote copy or Global Mirror 
only, use the chsystem command. The chsystem command features the following parameters 
for MM/GM:
/SM590000-relationshipbandwidthlimit cluster_relationship_bandwidth_limit
This parameter controls the maximum rate at which any one remote copy relationship can 
synchronize. The default value for the relationship bandwidth limit is 25 MBps (megabytes 
per second), but this value can now be specified as 1 - 100,000 MBps. 
The partnership overall limit is controlled at a partnership level by the chpartnership 
-linkbandwidthmbits command, and must be set on each involved system.
/SM590000-gmlinktolerance link_tolerance 
This parameter specifies the maximum period that the system tolerates delay before 
stopping Global Mirror relationships. Specify values of 60 - 86,400 seconds in increments 
of 10 seconds. The default value is 300. Do not change this value except under the 
direction of IBM Support.
Note: This command is not supported on IP partnerships. Use mkippartnership for 
IP connections.
Important: Do not set this value higher than the default without first establishing that 
the higher bandwidth can be sustained without affecting the host’s performance. The 
limit must never be higher than the maximum that is supported by the infrastructure 
connecting the remote sites, regardless of the compression rates that you might 
achieve.