Hitachi G200 - Failover Software; Overview of Initial, Update Copy Operations

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The primary system must be LAN-attached to a Device Manager -
Storage Navigator computer.
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The secondary system should also be LAN-attached to a separate
Device Manager - Storage Navigator at the remote site. This allows
you to perform operations more efficiently on the secondary system in
the event that the main site is not available.
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When you use virtual storage machine volumes, the physical LDEV ID,
serial number, and the virtual information for the storage system are
displayed on Device Manager - Storage Navigator. However, you
cannot add remote connections by specifying the serial number of the
virtual storage machine or create pairs by specifying the virtual LDEV
ID. When you perform TrueCopy operations using Device Manager -
Storage Navigator, specify the physical LDEV ID and serial number of
the storage system.
• Command Control Interface, which is a command line interface used to
display pair information and perform all copying and pair-managing
operations. CCI provides a full scripting capability that can be used to
automate replication operations. CCI is required for performing failover
operations.
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When you use virtual storage machine volumes in CCI, you can
specify the virtual information and the physical information of the VSP
Gx00 models and VSP Fx00 models in the configuration definition
files. However, when the primary system is HUS VM, specify the
physical information of the VSP Gx00 models and VSP Fx00 models in
the configuration definition files.
Failover software
Host failover software is used to transfer information between host servers at
the local and remote sites. It is a critical component of any disaster recovery
solution.
• When TrueCopy is used as a disaster recovery tool, host failover is
required to ensure effective recovery operations.
• When TrueCopy is used as a data migration tool, host failover is
recommended.
TrueCopy does not provide host failover functions. Use the failover software
most suitable for your platform and requirements (for example, Microsoft
Cluster Server).
Overview of initial, update copy operations
When you perform the initial copy operation, all the data in the P-VOL is
copied into the S-VOL. Thereafter, the primary storage system runs update
copy when it receives write instruction from the host. The update operation
copies host updates to the S-VOL at the same time that they are copied to
the P-VOL.
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TrueCopy overview
Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models