To decrease the size of an Enhanced FlashCopy logical drive repository logical drive by the number of
logical drives as defined by the count parameter repository logical drive use this command:
v
set EnhancedFlashCopyLogicalDrive ["EnhancedFlashCopyLogicalDriveName"]
decreaseRepositoryCapacity count=numberOfLogicalDrives
To decrease the size of an Enhanced FlashCopy group repository logical drive by the number of logical
drives as defined by the
count
parameter, use this command:
set EnhancedFlashCopyGroup ["EnhancedFlashCopyGroupName"]
decreaseRepositoryCapacity count=numberOfLogicalDrives
Starting, Stopping, and Resuming an Enhanced FlashCopy Image
Rollback
Enhanced FlashCopy images are useful any time you need to be able to roll back to a known good data
set at a specific point in time. For example, before performing a risky operation on a logical drive, you
can create an Enhanced FlashCopy image to enable “undo” capability for the entire logical drive. You can
start a rollback from the following types of Enhanced FlashCopy images:
v
Enhanced FlashCopy image of a base logical drive, which allows you to roll back the base logical drive
associated with an Enhanced FlashCopy group to a previous state.
v
Consistency group Enhanced FlashCopy image, which allows you to roll back all or select member
logical drives of the consistency group to a previous state.
The Enhanced FlashCopy image rollback commands provide a way for you to manage the content that is
maintained by Enhanced FlashCopy groups and Enhanced FlashCopy consistency groups. An Enhanced
FlashCopy image rollback operation enables you to restore the contents of a base logical drive to a
point-in-time image that was captured when an Enhanced FlashCopy image was created. The base logical
drive is then immediately accessible for read/write operation using the rolled-back content after the
controller firmware accepts the rollback request. The read/write operation can take place while the
rolled-back content is being transferred to the base logical drive.
You can roll back data by either:
v
Creating an Enhanced FlashCopy logical drive of an Enhanced FlashCopy image, which allows you to
retrieve deleted files from that Enhanced FlashCopy logical drive (the base logical drive remains
undisturbed).
v
Restoring an Enhanced FlashCopy image to the base logical drive, which allows you to roll back the
base logical drive to a previous point-in-time.
Note:
The host will have immediate access to the new-rolled-back base logical drive, but the existing
base logical drive will not allow the host read-write access once the rollback is initiated. You can create
an Enhanced FlashCopy of the base logical drive just prior to initiating the rollback to preserve the
pre-rollback base logical drive for recovery purposes.
Keep these guidelines in mind before you start a rollback operation:
v
The rollback operation does not change the content of the Enhanced FlashCopy images that are
associated with the base logical drive.
v
You cannot perform the following actions when a rollback operation is in progress:
– Delete the Enhanced FlashCopy image that is being used for the rollback.
– Create a new Enhanced FlashCopy image for a base logical drive that is participating in a rollback
operation.
– Change the associated Enhanced FlashCopy group’s Repository-Full Policy
v
You cannot start a rollback operation when any of these operations are in progress in the storage
subsystem:
– Dynamic Capacity Expansion (DCE) to increase the capacity of an subsystem.
– Dynamic Volume Expansion (DVE) to increase the capacity of a logical drive.
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