Use the startfcconsistgrp command to start a FlashCopy consistency group of
mappings. This command makes a point-in-time copy of the source volumes at the moment that the
command is started.
Syntax
startfcconsistgrp [ -prep ] [ -restore ] { fc_consist_group_id | fc_consist_group_name }
Parameters
- -prep
- (Optional) Specifies that the designated FlashCopy consistency group be
prepared prior to starting the FlashCopy
consistency group. A FlashCopy
consistency group must be prepared before it can be started. When you use this parameter, the
system automatically issues the prestartfcconsistgrp command for the group
that you specify.
- -restore
- (Optional) Specifies the restore flag. When combined with the prep
option, this forces the consistency group to be prepared even if the target volume of one of
the mappings in the consistency group is being used as a source volume in another active
mapping. An active mapping is in the copying, suspended, or stopping state.
- fc_consist_group_id | fc_consist_group_name
- (Required) Specifies the ID or name of the consistency group mapping to start.
Description
This
command starts a consistency group, which results in a point-in-time copy of the source volumes
of all mappings in the consistency group. You can combine the restore
parameter with the prep parameter to force the consistency group to be
prepared prior to starting, even if the target volume of one or more mappings in the consistency
group 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 starting a consistency group where none of the target volumes are
the source volume of another active mapping, the parameter is ignored.
If a consistency
group is started and the target volume of the mapping being started has up to four other
incremental FlashCopy mappings using the target, the
incremental recording is left on. If there are more than four other incremental FlashCopy mappings using the target volume, the incremental
recording for all of these mappings is turned off until they are restarted.
Note: The
startfcconsistgrp command can take some time to process particularly if you
have specified the prep parameter. If you use the prep
parameter, you give additional processing control to the system because the system must prepare
the mapping before the mapping is started. If the prepare process takes too long, the system
completes the prepare but does not start the consistency group. In this case, error message
CMMVC6209E displays. To control the processing times of the
prestartfcconsistgrp and startfcconsistgrp commands
independently of each other, do not use the prep parameter. Instead, first
issue the prestartfcconsistgrp command, and then issue the
startfcconsistgrp command to start the copy.
This command is
rejected if the target of the FlashCopy mapping in
the specified consistency group is the secondary volume in a remote copy relationship (so that
the FlashCopy target is the remote copy secondary).
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, if the target
of the FlashCopy mapping in the specified
consistency group is the primary volume in a remote copy relationship (so that the FlashCopy target is the remote copy primary target:
- 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.
Maps that are
rc_controlled are not shown in the view when this command is
specified.
If any source
volumes in the FlashCopy consistency group are in an
active-active relationship, the group can only be started if the information
on all those source volumes current, or an older copy to which access has been provided by
specifying:
stoprcrelationship -access
A current volume in an
active-active relationship is the primary copy, or the secondary copy when the
relationship's state is
consistent_syncronized.
An invocation
example
startfcconsistgrp -prep 2
The resulting output:
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