About nondisruptive migration

Nondisruptive Migration User Guide

Version
9.6.0
Audience
anonymous
Part Number
MK-92RD8086-11

Hitachi Command Suite (HCS) nondisruptive migration makes it possible to relocate data from data from an existing (source) storage system to a new (target) storage system without interrupting access by hosts. This is accomplished using the global storage virtualization technology of Hitachi Virtual Storage Platform 5000 series (VSP 5000 series), Hitachi Virtual Storage Platform G1x00 (VSP G1x00), Hitachi Virtual Storage Platform F1500 (VSP F1500), Hitachi Virtual Storage Platform G200, G400, G600, G800, VSP G350, G370, G700, G900 (VSP Gx00 models), VSP F400, F600, F800, VSP F350, F370, F700, F900 (VSP Fx00 models), and Hitachi Virtual Storage Platform N400, N600, N800 (VSP Nx00 models). Resources on the source storage system are virtualized on the target storage system. From the perspective of the host, I/O requests continue to be serviced by the source storage system during the migration process.

The following storage system combinations are supported:

Source

Target

Hitachi Universal Storage Platform V/VM

VSP G1500, and VSP F1500

Hitachi Universal Storage Platform V/VM

VSP Gx00 models, VSP Fx00 models, and VSP Nx00 models

Hitachi Virtual Storage Platform

VSP 5000 series

Hitachi Virtual Storage Platform

VSP G1000, VSP G1500, and VSP F1500

Hitachi Unified Storage VM VSP 5000 series

Hitachi Unified Storage VM

VSP G1000, VSP G1500, and VSP F1500

Hitachi Unified Storage VM

VSP Gx00 models, VSP Fx00 models, and

VSP Nx00 models

You can migrate the following types of data:
  • Volumes
  • Copy pair configurations (ShadowImage)

To migrate volumes and copy pair configurations, you create a migration project for a source and target storage system. You create one or more migration jobs within a migration project. Then, you perform individual migration steps for each migration job to complete the migration over time at a sustainable work load.

When you create a migration project, a virtual storage machine is created on the target storage system. This virtual storage machine contains the information about the source storage system. Source volumes that are selected for migration are virtualized, masking the physical characteristics of the target storage system, and the data is migrated to target volumes on the target storage system. As far as the host is concerned, I/O requests are still being serviced by the source target system during the migration process.
Note: In this guide, target volume means the virtualized source volume that resolves to the target volume, and target volume for data migration means the physical target storage system volume to which migration data will be written.
HCS nondisruptive migration has several benefits:
  • Data is migrated between storage systems without interrupting host applications.
  • You can maintain data replication throughout the migration process by allowing the target storage system to inherit pair configurations before migrating the actual data.
  • You can reduce the overall migration effort by importing configuration definition files instead of having to reconfigure pairs on the target storage system.
  • The migration process is designed to be carried out in stages to reduce demands on network bandwidth.
  • You can easily monitor migration project and migration job progress and status by reviewing both numerical and graphical data, which includes estimated information about how long the migration is likely to take.
  • Multiple storage systems can be consolidated into a single target VSP 5000 series, VSP G1000, VSP G1500, VSP F1500 , VSP Gx00 models, VSP Fx00 models, or VSP Nx00 models.