Complete this task to prepare for disaster recovery of a FlashCopy
consistency group in a Global Mirror configuration.
Issue the setflashrevertible command to a FlashCopy® relationship
with the persistent, change recording, target write inhibit, and no copy options
enabled, and the revertible option disabled. It is not valid to issue the setflashrevertible command
to a FlashCopy relationship
that is already revertible.
The setflashrevertible command modifies a FlashCopy
volume pair that is part of a Global Mirror relationship
to revertible. If a failure occurs on the primary site during
a Global Mirror create FlashCopy consistency
group process and if that failure results in an inconsistency of the FlashCopy consistency
group target volumes, you might be able to correct the inconsistency either
by discarding changes or committing changes to the target volumes. The revertible
option allows data to be committed to the target to form a new consistency
group or to be reverted back to the last consistency group. The setflashrevertible command
must be run before the FlashCopy pair can be committed or reverted. You must
have previously created a FlashCopy relationship with the persistent, change
recording, target write inhibit, and no copy options enabled. The FlashCopy Revertible
option must be disabled prior to performing this task. It is not valid to
perform the FlashCopy Revertible
task on a FlashCopy relationship
that is already revertible.
The FlashCopy Revertible
task restarts an existing FlashCopy volume pair with the revertible option
enabled for disaster recovery. The FlashCopy Revertible option remains
in effect until the commit changes or discard changes task is performed. Both
the commit changes and discard changes tasks disable the FlashCopy revertible
option.
You can perform the FlashCopy Revertible task using either
the DS CLI or
the DS Storage Manager.
Perform
the following steps to apply the revertible option to existing FlashCopy relationships
with DS CLI commands. The example commands in this task are shown in two formats.
The first format shows the type of information that the command requires.
The second format is an example command with declared values for the variables.
Note: The -nocp, -record, -persist,
and -tgtinhibit (target inhibit) parameters are included automatically
when this command processes.
Issue the setflashrevertible command to apply the revertible
option to existing FlashCopy relationships. Enter the setflashrevertible command
at the dscli command prompt with the following parameters and variables: dscli>setflashrevertible -dev storage_image_ID sourcevolumeID:targetvolumeID
Note: Specify
the storage unit for the -dev storage_image_ID parameter. This parameter
is required if you do not specify a fully qualified ID for the source and
target volumes and you do not specify a value for the devid variable
in your profile file.
Example
dscli>setflashrevertible
IBM.1750-68FA120/0100:IBM.1750-68FA120/0200
The resulting output
Date/Time: Sun Aug 11 02:23:49 PST 2004 IBM DS CLI Version: 5.0.0.0
DS: IBM.1750-68FA120
FlashCopy volume pair IBM.1750-68FA120/0100:IBM.1750-68FA120/0200 successfully
made revertible.