72 IBM Flex System V7000 Storage Node Introduction and Implementation Guide
FCoE allows for fewer network adapters to be required, as both protocols can share the same
adapter, reducing hardware cost and freeing up bus slots in hosts.
For in-depth details and recommendations for using these protocols, see Storage and
Network Convergence Using FCoE and iSCSI, SG24-7986 available at this website:
http://w3.itso.ibm.com/abstracts/sg247986.html?Open
2.6 Advanced copy services
IBM Flex System V7000 Storage Node supports the following copy services:
FlashCopy
Synchronous Remote Copy
Asynchronous Remote Copy
2.6.1 FlashCopy
FlashCopy makes a copy of a source volume on a target volume. The original content of the
target volume is lost. After the copy operation has started, the target volume has the contents
of the source volume as they existed at a single point in time. Although the copy operation
takes time, the resulting data at the target appears as though the copy was
made instantaneously.
FlashCopy is sometimes described as an instance of a time-zero (T0) copy or a point in time
(PiT) copy technology.
FlashCopy can be performed on multiple source and target volumes. FlashCopy permits the
management operations to be coordinated so that a common single point in time is chosen
for copying target volumes from their respective source volumes.
IBM Flex System V7000 Storage Node also permits multiple target volumes to be
FlashCopied from the same source volume. This capability can be used to create images
from separate points in time for the source volume, and to create multiple images from a
source volume at a common point in time. Source and target volumes can be thin-provisioned
volumes.
Reverse FlashCopy enables target volumes to become restore points for the source volume
without breaking the FlashCopy relationship and without waiting for the original copy
operation to complete. IBM Flex System V7000 Storage Node supports multiple targets and
thus multiple rollback points.
Most clients aim to integrate the FlashCopy feature for point in time copies and quick recovery
of their applications and databases. IBM Support is provided by Tivoli Storage FlashCopy
Manager, which is described at the following website:
http://www-01.ibm.com/software/tivoli/products/storage-flashcopy-mgr/
You can read a detailed description about the FlashCopy copy services in 9.2, “FlashCopy” on
page 342.
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