IBM Flex System V7000 Expansion Enclosure 4939H29 Manual Do Utilizador

Draft Document for Review January 29, 2013 12:52 pm

IBM Flex System V7000 Storage Node Introduction and Implementation Guide

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ConsistentDisconnected

The volumes in this half of the consistency group are all operating in the secondary role 
and can accept read I/O operations but not write I/O operations.

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Empty

The consistency group does not contain any relationships.

Before you use Remote Copy, you need to plan for its usage.

General guidelines for Remote Copy include the following items:

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Partnerships between a mix of up to four IBM Flex System V7000 Storage Node, IBM 
Storwize V7000 storage systems or IBM SAN Volume Controller systems is allowed. The 
partnership must be defined on all partnered members to make it fully functional.

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The two volumes in a relationship must be the same size.

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The Remote Copy relationship can be established on the volumes within one IBM Flex 
System V7000 Storage Node system or in different IBM Flex System V7000 Storage Node 
system. When the two volumes are in the same cluster, they must be in the same I/O 
group.

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You can use Remote Copy target volumes as Remote Copy source volumes. A FlashCopy 
target volume can be used as Remote Copy source volume, as of Version 6.2.0. There are 
additional restrictions outlined in Table 9-5 on page 396.

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The Metro Mirror function supports copy operations between volumes that are 
separatedby distances up to 300 km. Metro Mirroring is supported over either an FC or 
FCoE SAN infrastructure.

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Global Mirroring function supports copy operations between volumes that are separated 
by distances over 300 km. Global Mirroring is only supported over an FC SAN 
infrastructure. 

At this time no remote mirroring functions are supported over the iSCSI fabric. Consult 
IBM System Storage Interoperation Center (SSIC) for supported configurations at: 

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One Remote Copy relationship can only belong to one consistency group.

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All relationships in a consistency group must have matching primary and secondary 
clusters, which are sometimes referred to as master and auxiliary clusters. All 
relationships in a consistency group must also have the same copy direction and state.

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Metro Mirror and Global Mirror relationships cannot belong to the same 
consistency group.

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To manage multiple Remote Copy relationships as one entity, relationships can be made 
part of a Remote Copy consistency group, which ensures data consistency across 
multiple Remote Copy relationships and provides ease of management.

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An IBM Flex System V7000 storage system implements flexible resynchronization 
support, enabling it to resynchronize volume pairs that have experienced write I/Os to both 
disks and to resynchronize only those regions that are known to have changed.

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With IBM Flex System V7000, customers may wish to use the global mirror capability 
which enables them to have a low bandwidth link between sites. This capability is known