- It cannot be resynchronized.
- It cannot be created and registered in CTG 127.
However, a pair can be deleted when status is changing to PSUE.
• In a bi-directional configuration, if all data paths for the primary system
of the reverse direction pair are disconnected when pair status is
changing to PSUE, the disconnection may not be detected.
• If all the data paths for TrueCopy pairs are disconnected, but the paths
used for UR pairs are connected, failure suspend does not occur and S-
VOLs cannot be changed to PSUE status.
• If you turn off the power of the primary system when S-VOLs are in PAIR
status, all the data paths for the primary system will be disconnected and
all the S-VOLs registered in CTG 127 will be changed to PSUE status.
Host failover software
Host failover software transfers information between host servers at the local
and remote sites and is a critical component of a 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).
Data path requirements and configurations
A data path must be designed to adequately manage all possible amounts of
data that could be generated by the host and sent to the P-VOL and S-VOL.
This topic provides requirements and planning considerations for the following
key elements of the data path:
•
Ports on page 3-26
•
Bandwidth requirements on page 3-26
• Fibre Channel data path requirements on page 3-26
• iSCSI data path requirements on page 3-27
• Supported data path configurations on page 3-29
Caution:
• Before replacing a data path (Fibre Channel or iSCSI), first delete the
pairs and delete the remote paths that use the data path to be replaced,
and then replace the data path. Do not replace a data path that is being
used for remote copy operations.
• Use the same protocol for the data paths between the host and storage
system and between the primary and secondary storage systems. When
Planning for TrueCopy
3-25
Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models
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