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2.6.2 IBM Flex System V7000 Remote Mirroring software
The IBM Flex System V7000 Remote Mirroring software provides both Metro and Global
mirroring capabilities between the IBM Flex System V7000 Storage Nodes, or between IBM
Flex System V7000 Storage Nodes and IBM Storwize V7000s or IBM SAN Volume
Controllers (SVC). This capability means that customers have greater flexibility in their
expanding environments using Flex System V7000, Storwize V7000, and SVC with the ability
now to remote mirror from one system to the other. With the wide variety of storage systems
that can be managed under any of these systems, the options available for replicating data
between a number of storage systems is multiplied. Remote deployments for disaster
recovery for current SVC and Storwize V7000 environments can easily be fitted with the Flex
System V7000 or vice versa.
The Copy Services layer sits above and operates independently of the function or
characteristics of the underlying disk subsystems used to provide the storage resources to
the IBM Flex System V7000 Storage Node. Figure 2-19 shows an example of possible copy
service relationships (they must be at Version 6.4 or later).
Figure 2-19 Example of possible copy services relationships
With Metro Mirroring, IBM Flex System V7000 Remote Mirroring provides synchronous data
replication at distances less than 300 Km. This capability is supported across either an FC or
FCoE SAN fabric infrastructure. Mirroring over iSCSI connections is not currently supported.
Global Mirroring provides for long distances of greater than 300 Km and is only supported
over an FC SAN infrastructure. Tunneling over a WAN network is frequently used for the
greater distance needs.
Customers who want to use the global mirror capability with Flex System V7000 on a low
bandwidth link between sites can do so with the use of the low bandwidth remote mirroring.
This capability provides options to help administrators balance network bandwidth
requirements and RPO times for applications, helping reduce operation costs for disaster
recovery solutions. Remote mirroring supports higher RPO times by allowing the data at the
disaster recovery site to get further out of sync with the production site if the communication
link limits replication, and then approaches synchronicity again when the link is not as busy.
This low bandwidth remote mirroring uses space-efficient FlashCopy targets as sources in
remote copy relationships to increase the time allowed to complete a remote copy data cycle.
See 9.3, "Remote Copy" on page 380 for more information about the Remote Copy services.
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Chapter 2. Introduction to IBM Flex System V7000 Storage Node
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