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:
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