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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