Use the prestartfcmap command to prepare a FlashCopy mapping so that it can be
started. This command flushes the cache of any data that is destined for the source volume and
forces the cache into the write-through mode until the mapping is started.
Syntax
prestartfcmap [ -restore ] { fc_map_id | fc_map_name }
Parameters
- -restore
- (Optional) Specifies the restore flag. This forces the mapping to be prepared even if the
target volume is being used as a source volume in another active mapping. An active mapping is
in the copying, suspended, or stopping state.
- fc_map_id | fc_map_name
- (Required) Specifies the name or ID of the mapping to prepare.
Description
This
command prepares a single mapping for subsequent starting. The preparation step ensures that any
data that resides in the cache for the source volume is first transferred to disk. This step
ensures that the copy that is made is consistent with what the operating system expects on the
disk.
The restore parameter can be used to force the mapping to be
prepared even if the target volume is being used as a source volume of another active mapping.
In this case, the mapping is restoring as shown in the lsfcmap view. If the
restore parameter is specified when preparing a mapping where the target
volume is not the source volume of another active mapping, then the parameter is
ignored.
Note: To prepare a FlashCopy mapping that is part of a
consistency group, you must use the prestartfcconsistgrp
command.
The mapping must be in the idle_or_copied or
stopped state before it can be prepared. When the
prestartfcmap command is processed, the mapping enters the preparing state.
After the preparation is complete, it changes to the prepared state. At this point, the mapping
is ready to start.
Attention: This command can take a considerable amount of time
to complete. For example, while a volume is in the prepared state, response
times might increase.
This
command is rejected if the target of the FlashCopy
mappings is the secondary volume in a Metro Mirror, Global Mirror, or
active-active relationship (so that the FlashCopy target is the remote copy secondary). Remote copy
includes Metro Mirror, Global Mirror, and active-active.Note: If the
remote copy is idling or disconnected, even if the FlashCopy and remote copy are pointing to the same volume, the auxiliary volume is not
necessarily the secondary volume. In this case, you can start a FlashCopy mapping.
The FlashCopy mapping also fails in the following cases:
- The remote copy is active.
- The FlashCopy target (and remote copy primary
target) volume is offline. If this occurs, the FlashCopy mapping stops and the target volume remains offline.
Note: Maps that are rc_controlled are not shown in the view when
this command is specified.
An invocation example
prestartfcmap 1
The
resulting output:
No feedback