Pair operations workflow
You must have Storage Administrator (Remote Copy) role to perform
TrueCopy operations.
Basic TrueCopy operations consist of the following operations.
• Check prerequisites for each procedure.
• Always check pair status. Each TrueCopy operation requires the pair to be
in a specific status.
• Create a pair, in which the S-VOL becomes a duplicate of the P-VOL.
• Split a pair, which separates the P-VOL and S-VOL and allows read/write
access to the S-VOL if desired.
• Resynchronize a pair, in which the S-VOL again mirrors the on-going,
current data in the P-VOL.
• Delete a pair.
Disaster recovery procedures are discussed in Chapter 9, Disaster recovery
on page 9-1.
Note: To perform pair operations or check the pair status, LU paths must be
established. If you intend to perform storage or replication management
operations, make sure that pairs are deleted before removing LU path
definitions.
Note: Pair operations cannot be performed when changing the firmware, nor
if firmware changes are cancelled. If you start a firmware change, make sure
it completes before performing pair operations.
Note: When the following conditions occur during TC pair duplication,
sometimes the split operation prioritizes update I/O rather than TC pair
duplication.
• The MP unit processor operation rate to which the P-VOL belongs is 70%
or above in the primary system.
• The update I/O inflow of the P-VOL is large in the primary system.
• The MP unit write-pending to which the S-VOL belongs is 65% or above in
the secondary system.
When creating or resynchronizing a TC pair, be aware of the storage system
load at each site.
Checking pair status
Every TrueCopy operation requires that the pairs have a specific status.
Before performing any operation, check pair status.
• Find status requirements under the prerequisite information for each
operation.
• To view a pair's current status in the GUI, or review status definitions, see
Monitoring pair status, license capacity on page 7-2.
6-2
TC pair operations
Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models
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