Chapter 10. Copy services 505
Start When all of the FlashCopy mappings in a Consistency Group are in the
prepared state, the FlashCopy mappings can be started. To preserve
the cross-volume Consistency Group, the start of all of the FlashCopy
mappings in the Consistency Group must be synchronized correctly
concerning I/Os that are directed at the volumes by using the
startfcmap or startfcconsistgrp command.
The following actions occur during the running of the startfcmap
command or the startfcconsistgrp command:
New reads and writes to all source volumes in the Consistency
Group are paused in the cache layer until all ongoing reads and
writes beneath the cache layer are completed.
After all FlashCopy mappings in the Consistency Group are
paused, the internal cluster state is set to enable FlashCopy
operations.
After the cluster state is set for all FlashCopy mappings in the
Consistency Group, read and write operations continue on the
source volumes.
The target volumes are brought online.
As part of the startfcmap or startfcconsistgrp command, read and
write caching is enabled for the source and target volumes.
Modify The following FlashCopy mapping properties can be modified:
FlashCopy mapping name
Clean rate
Consistency group
Copy rate (for background copy or stopping copy priority)
Automatic deletion of the mapping when the background copy is
complete
Stop The following separate mechanisms can be used to stop a FlashCopy
mapping:
Issue a command
An I/O error occurred
Delete This command requests that the specified FlashCopy mapping is
deleted. If the FlashCopy mapping is in the copying state, the force
flag must be used.
Flush failed If the flush of data from the cache cannot be completed, the FlashCopy
mapping enters the stopped state.
Copy complete After all of the source data is copied to the target and there are no
dependent mappings, the state is set to copied. If the option to
automatically delete the mapping after the background copy completes
is specified, the FlashCopy mapping is deleted automatically. If this
option is not specified, the FlashCopy mapping is not deleted
automatically and can be reactivated by preparing and starting again.
Bitmap online/offline The node failed.
Mapping event Description
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