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HyperMirror Feature Guide 10

OceanStor 18500 V3 and 18800 V3 Mission Critical Storage System V300R003

"This document describes the implementation principles and application scenarios of theHyperMirror feature. Also, it explains how to configure and manage HyperMirror."
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Application Scenarios

Application Scenarios

This section describes the application scenarios of HyperMirror feature. By generating two mirror copies of either a local or external LUN, HyperMirror implements continuous data protection for that LUN. If the LUN or either mirror copy is damaged, host applications will remain unaffected. Therefore, HyperMirror improves the reliability of LUNs and lowers disaster recovery risks and maintenance costs.

HyperMirror applies to the following scenarios:
  • Works with the SmartVirtualization feature to generate redundant data backup in heterogeneous storage systems.
    NOTE:
    For details about the SmartVirtualization feature, refer to OceanStor 18500 V3&18800 V3 Mission Critical Storage System V300R003 SmartVirtualization Feature Guide.
  • Works with SmartVirtualization to back up data between heterogeneous storage systems.
  • Provides continuous protection for data on local LUNs.

Working with SmartVirtualization for Redundant Data Backup in Heterogeneous Storage Systems

To centrally manage storage systems from different vendors in one equipment room, you can use the SmartVirtualization feature of a Huawei storage system to take control of heterogeneous storage systems. After this takeover, the heterogeneous storage systems are centrally managed as external LUNs (displayed as eDevLUN in Huawei storage systems). However, the wide variety of storage systems may cause faults, service interruption, or even data loss. To prevent these problems, you can use the HyperMirror feature to create a mirror LUN for each of the eDevLUNs and map the mirror LUNs to hosts to read and write data. However, mirror copies are from the local storage system. You can copy all data of the external LUNs that correspond to eDevLUNs to the mirror copies of the local storage system, thereby ensuring the high reliability and availability of external LUNs. Figure 1-6 shows how HyperMirror generates redundant backups.
Figure 1-6  Redundant data backups for heterogeneous storage systems

Working with SmartVirtualization to Back Up Data Between Heterogeneous Storage Systems

To fully utilize idle or outdated heterogeneous storage systems and improve their reliability, you can combine the SmartVirtualization and HyperMirror features to assume control of these storage systems and create data backups between them. Mirror LUNs are mapped to hosts for reads and writes. Redundancy improves LUN reliability. In this way, link faults and other faults of heterogeneous storage systems can be prevented and reliability of a single heterogeneous storage system can be improved, as shown in Figure 1-7.

Figure 1-7  Data backup between heterogeneous storage systems

Continuous Data Protection for Local LUNs

To prevent the failure of a local LUN from causing service interruption or data loss, you can improve the LUN's reliability by creating a mirror LUN. The mirror copies are from different disk domains. If the disk domain of local LUNs malfunctions, the mirror copies in another disk domain are not affected. The mirror copies take over host services on the local LUNs, ensuring proper running of host services. Figure 1-8 shows how HyperMirror protects a local LUN.
Figure 1-8  Continuous data protection for a local LUN

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Updated: 2018-06-05

Document ID: EDOC1000084070

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