Complete this task to correct the revertible states and FlashCopy
sequence numbers that require the use of the DS CLI revertflash command.
This is the fifth step in the Global Mirror failover recovery process unless
your corrections require the use of the commitflash DS CLI command.
In this case, the use of the commitflash command becomes your fifth
step.
You can use the
revertflash command only when your analysis
of the FlashCopy relationships reveals one of the following conditions:
- The FlashCopy relationships are revertible and all the sequence numbers
are equal.
- There is a group of FlashCopy pairs that are all revertible and another
group of FlashCopy pairs that are all nonrevertible. In addition, all the
FlashCopy sequence numbers are not equal. However, the following conditions
exist:
- The FlashCopy sequence number for all revertible pairs is equal.
- The FlashCopy sequence number for all nonrevertible pairs is equal.
The revert action removes the FlashCopy relationship changes and
resets them to the last consistency group state. The revertible state is set
to No.
Perform the following step to correct the applicable FlashCopy
relationships. The example command in this task is shown in two formats. The
first format shows the type of information that the command requires. The
second format provides the command with declared values for the variables.
Issue the revertflash command to correct the FlashCopy relationships
and reset them to the last consistency group state. Enter the revertflash command
at the dscli command prompt with the following parameters and variables: dscli>revertflash -dev storage_image_ID SourceVolumeID
Example
dscli>revertflash -dev IBM.1750-68FA150 0100
Notes: - Remember that the storage_image_ID is the value for the remote
server that has been designated the primary server until the original primary
server is available for use.
- Global Mirror operations have performed the establish FlashCopy revertible
processing as it was trying to form a consistency group before the disaster
occurred. If your analysis, through use of the lsflash command, has
determined that a revertflash command is needed, then there is no need
to issue a new mkflash command.
A confirmation message like the following
one is generated for each FlashCopy relationship that has been successfully
reset.
FlashCopy pair 0100:0200 successfully reverted to the previous consistency.
After all the FlashCopy relationships have been corrected, you are
ready to use the fast reverse restore process, which is the next step in the
Global Mirror disaster recovery process.