EMC CX500I Configuration Guide - Page 82

Provision for Disaster Recovery with Minimal Overhead, CLARiiON Environment, Bidirectional Mirroring

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Page 82 highlights

Data Replication and Data Mobility Software Provision for Disaster Recovery with Minimal Overhead The provision for disaster recovery is the major benefit of MirrorView/A mirroring. Destruction of the data at the primary site would cripple or ruin many organizations. MirrorView/A lets data processing operations resume with minimal overhead. MirrorView/A enables a quicker recovery by creating and maintaining a copy of the data on another storage system. MirrorView/A is transparent to hosts and their applications. Host applications do not know that a LUN is mirrored and the effect on performance is minimal. With MirrorView/A, secondary systems are periodically updated. MirrorView/A is not host-based; therefore it uses no host I/O or CPU resources. The processing for mirroring is performed on the storage system. CLARiiON Environment MirrorView/A operates in a highly available environment, leveraging the dual-SP design of CLARiiON storage systems. If one SP fails, MirrorView/A running on the other SP controls and maintains the mirrored LUNs. If the server is able to fail over I/O to the remaining SP, then periodic updates continue. The highly-available features of RAID protect against disk failure, and mirrors are resilient to an SP failure in the primary of secondary storage system. Bidirectional Mirroring A single storage system can be primary (that is, hold the primary image) for some mirrors and secondary (that is, hold the secondary image) for others. This enables bidirectional mirroring. A storage system can never hold more than one image of a single mirror. Integration with SnapView Software SnapView software lets you create a snapshot of an active LUN at any point in time; however, do this only when the mirror is not updating the secondary image. The snapshot is a consistent image that can serve for other application purposes while I/O continues to the source LUN. The secondary image is not viewable to any hosts, but you can use SnapView in conjunction with MirrorView/A to create a snapshot of a secondary image on a secondary storage system to perform data verification and run parallel processes. 4-20 EMC CLARiiON CX300, CX500, CX500i, and CX700 Storage Systems Configuration Planning Guide

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4-20
EMC CLARiiON CX300, CX500, CX500i, and CX700 Storage Systems Configuration Planning Guide
Data Replication and Data Mobility Software
Provision for Disaster Recovery with Minimal Overhead
The provision for disaster recovery is the major benefit of
MirrorView/A mirroring. Destruction of the data at the primary site
would cripple or ruin many organizations. MirrorView/A lets data
processing operations resume with minimal overhead.
MirrorView/A enables a quicker recovery by creating and
maintaining a copy of the data on another storage system.
MirrorView/A is transparent to hosts and their applications. Host
applications do not know that a LUN is mirrored and the effect on
performance is minimal.
With MirrorView/A, secondary systems are periodically updated.
MirrorView/A is not host-based; therefore it uses no host I/O or CPU
resources. The processing for mirroring is performed on the storage
system.
CLARiiON Environment
MirrorView/A operates in a highly available environment,
leveraging the dual-SP design of CLARiiON storage systems. If one
SP fails, MirrorView/A running on the other SP controls and
maintains the mirrored LUNs. If the server is able to fail over I/O to
the remaining SP, then periodic updates continue. The
highly-available features of RAID protect against disk failure, and
mirrors are resilient to an SP failure in the primary of secondary
storage system.
Bidirectional Mirroring
A single storage system can be primary (that is, hold the primary
image) for some mirrors and secondary (that is, hold the secondary
image) for others. This enables bidirectional mirroring.
A storage system can never hold more than one image of a single mirror.
Integration with SnapView Software
SnapView software lets you create a snapshot of an active LUN at any
point in time; however, do this only when the mirror is not updating
the secondary image. The snapshot is a consistent image that can
serve for other application purposes while I/O continues to the
source LUN. The secondary image is not viewable to any hosts, but
you can use SnapView in conjunction with MirrorView/A to create a
snapshot of a secondary image on a secondary storage system to
perform data verification and run parallel processes.