IBM Flex System V7000 Expansion Enclosure 4939H29 用户手册
产品代码
4939H29
Chapter 2. Introduction to IBM Flex System V7000 Storage Node
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Draft Document for Review January 29, 2013 12:52 pm
8068ch02-HW Intro.fm
This function is used to create copies of copies and supports full, incremental, or
nocopy operations.
nocopy operations.
– Reverse FlashCopy
This function allows data from an earlier point-in-time copy to be restored with minimal
disruption to the host.
disruption to the host.
– FlashCopy nocopy with thin provisioning
This function provides a combination of using thin-provisioned volumes and FlashCopy
together to help reduce disk space requirements when making copies. There are two
variations of this option:
together to help reduce disk space requirements when making copies. There are two
variations of this option:
•
Space-efficient source and target with background copy
Copies only the allocated space.
•
Space-efficient target with no background copy
Copies only the space used for changes between the source and target and is
generally referred to as “snapshots”.
generally referred to as “snapshots”.
This function may be used with multi-target, cascaded, and incremental FlashCopy.
– Consistency groups
Consistency groups address the issue where application data is on multiple volumes.
By placing the FlashCopy relationships into a consistency group, commands can be
issued against all of the volumes in the group. This action enables a consistent
point-in-time copy of all of the data, even though it might be on a physically
separate volume.
By placing the FlashCopy relationships into a consistency group, commands can be
issued against all of the volumes in the group. This action enables a consistent
point-in-time copy of all of the data, even though it might be on a physically
separate volume.
FlashCopy mappings can be members of a consistency group, or they can be operated
in a stand-alone manner, that is, not as part of a consistency group. FlashCopy
commands can be issued to a FlashCopy consistency group, which affects all
FlashCopy mappings in the consistency group, or to a single FlashCopy mapping if it is
not part of a defined FlashCopy consistency group.
in a stand-alone manner, that is, not as part of a consistency group. FlashCopy
commands can be issued to a FlashCopy consistency group, which affects all
FlashCopy mappings in the consistency group, or to a single FlashCopy mapping if it is
not part of a defined FlashCopy consistency group.
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Remote Copy feature
Remote Copy is an optional licensed feature that is based on the number of enclosures
that are being used at the smallest configuration location. See 2.6.3, “Remote Copy
licensing” on page 74 for licensing details. Remote Copy provides for the capability to
perform either Metro mirror or Global Mirror operations.
that are being used at the smallest configuration location. See 2.6.3, “Remote Copy
licensing” on page 74 for licensing details. Remote Copy provides for the capability to
perform either Metro mirror or Global Mirror operations.
– Metro Mirror
Provides a synchronous remote mirroring function up to approximately 300 km
between sites. As the host I/O only completes after the data is cached at both
locations, performance requirements might limit the practical distance. Metro Mirror is
designed to provide fully synchronized copies at both sites with zero data loss after the
initial copy is completed.
between sites. As the host I/O only completes after the data is cached at both
locations, performance requirements might limit the practical distance. Metro Mirror is
designed to provide fully synchronized copies at both sites with zero data loss after the
initial copy is completed.
Metro Mirror can operate between multiple IBM Flex System V7000 Storage Node
systems and is only supported on either FC or FCoE host interfaces.
systems and is only supported on either FC or FCoE host interfaces.
– Global Mirror
Provides long distance asynchronous remote mirroring function up to approximately
8,000 km between sites. With Global Mirror, the host I/O completes locally and the
changed data is sent to the remote site later. This function is designed to maintain a
consistent recoverable copy of data at the remote site, which lags behind the local site.
8,000 km between sites. With Global Mirror, the host I/O completes locally and the
changed data is sent to the remote site later. This function is designed to maintain a
consistent recoverable copy of data at the remote site, which lags behind the local site.
Global Mirror can operate between multiple IBM Flex System V7000 Storage Node
systems and is only supported on FC host interfaces.
systems and is only supported on FC host interfaces.