Multiple relationship FlashCopy
Multiple relationship FlashCopy allows a source to have FlashCopy
relationships with multiple targets simultaneously. This flexibility allows you
to establish up to 12 FlashCopy relationships on a given logical unit number
(LUN), volume, or data set, without needing to first wait for or cause
previous relationships to end.
Refresh target volume (also known as incremental FlashCopy)
Refresh target volume provides the ability to ″refresh″ a LUN or volume
involved in a FlashCopy relationship. When a subsequent FlashCopy
operation is initiated, only data that updates the target and the source to the
same point-in-time state is copied. The direction of the ″refresh″ can also
be reversed. The LUN or volume that was defined as the target can now
become the source for the LUN or the volume that was defined as the
source (now the target).
Persistent FlashCopy
Persistent FlashCopy allows the FlashCopy relationship to remain even
after the FlashCopy operation completes. You must explicitly delete the
relationship.
Establish FlashCopy on existing Remote Mirror and Copy source
The establish FlashCopy on an existing Remote Mirror and Copy source
volume option allows you to establish a FlashCopy relationship where the
target volume is also the source of an existing remote mirror and copy
source volume. This enables you to create full or incremental point-in-time
copies at a local site and then use remote mirroring commands to copy the
data to the remote site.
This feature is represented by the Establish target on existing Metro
Mirror source selection in the GUI.
Consistency group commands
Consistency group commands allow the DS8000 to freeze I/O activity to a
LUN or volume until you issue the FlashCopy consistency group command.
Consistency groups help create a consistent point-in-time copy across
multiple LUNs or volumes, and even across multiple DS8000 systems. This
function is available through the use of command-line interface commands.
Inband commands over remote mirror link
In a remote mirror environment, inband commands are issued to a source
volume of a remote mirror and copy volume pair on a local storage unit and
sent across paths (acting as a conduit) to a remote storage unit to enable a
FlashCopy pair to be established at the remote site. This eliminates the
need for a network connection to the remote site solely for the management
of FlashCopy. This function is available through the use of command-line
interface commands.
Disaster recovery using Copy Services
One of the main reasons for using Copy Services functions is in preparation for a
possible disaster by backing up, copying, and mirroring your data at the production
and recovery sites.
You can create a disaster recovery solution using any of the following functions.
These functions help improve a disaster recovery process by allowing a much
shorter recovery time with little or no data loss.
Chapter 1. Introduction to IBM TotalStorage DS8000 series 19
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