Extender connection
The following figure shows an extender connection, in which channel
extenders and switches are used to connect the devices across large
distances.
Figure 3-1 Extender Connection
Set port topology to the following:
• Fab on, Point-to-Point
Caution: Data traffic might concentrate on one switch when you perform
the following actions:
• Use a switch to connect the primary system and the secondary
systems with an extender.
• Gather several remote copy paths in one location.
If you are using a Hitachi switch to make the connection, contact Hitachi
Data Systems customer support.
Caution: Make sure that the channel extender supports remote I/Os.
Contact Hitachi Data Systems customer support for more information.
Note:
• Best practice is to create at least two independent data paths (one per
cluster) between the primary and secondary systems for hardware
redundancy for this critical element.
• When 4,000 pairs or more are used, we recommend that you restrict the
number of pairs when creating pairs, so that 4,000 pairs or less use one
physical path, to distribute load on the physical path.
• The same write-workload would be used in the reverse direction in a
disaster recovery scenario. Therefore, when planning TrueCopy for
disaster recovery, the same number of secondary-to-primary data paths
must be set up as the primary-to-secondary copy paths for normal
operations. Reverse direction paths must be set up independently of the
primary-to-secondary paths.
3-32
Planning for TrueCopy
Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models
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