• LDEV type for Volume Migration. The volume of the external
connection for the volume migration must be mapped to an LDEV as
OPEN-V.
Universal Replicator MxN configuration and control
Overview
Universal Replicator supports 4X4 by using sysplex timers on the mainframe.
However, open systems do not have an equivalent of sysplex timers on the
mainframe, because the SCSI protocol does not have timestamps.
If the open system (CCI) has the timestamp as an equivalent of sysplex
timers, Universal Replicator supports 4X4 on the open system.
• CCI: delivers the timestamp(CTQ-Marker) to the consistency group
• Storage system (RCU): arbitrates the timestamp (CTQ-Marker) across
multiple storage systems connected remote command devices, and then
commits the journal data.
In this architecture, CCI needs to be running. If CCI has stopped, the storage
system (RCU) function does not appear to exist. Therefore, the better
architecture is to include the storage system (RCU) function into CCI.
CCI already supports the group control across multiple storage systems in the
TC_Sync group. This means that CCI can support Universal Replicator MxN on
the open system if CCI is capable of delivering the timestamps and
committing the Journal data with a CTQ-Marker.
Thus, CCI supports UR MxN for open systems in the four ways described in
Policy on page 6-44.
Policy
All data consistency of the consistency group across multiple storage systems
is maintained by CCI. The storage system supports only basic functions;
there is no relation between storage systems in order to simplify testing and
configurations.
CCI supports Universal Replicator MxN in the following ways.
6-44
Data replication operations with CCI
Command Control Interface User and Reference Guide
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