Native remote replication with SRDF
The EMC Symmetrix Remote Data Facility (SRDF) family of products offers a range
of array based disaster recovery, parallel processing, and data migration solutions for
VMAX Family systems, including:
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HYPERMAX OS for VMAX All Flash 250F, 450F, 850F, and 950F arrays
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HYPERMAX OS for VMAX 100K, 200K, and 400K arrays
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Enginuity for VMAX 10K, 20K, and 40K arrays
SRDF replicates data between 2, 3 or 4 arrays located in the same room, on the same
campus, or thousands of kilometers apart. Replicated volumes may include a single
device, all devices on a system, or thousands of volumes across multiple systems.
SRDF disaster recovery solutions use “active, remote” mirroring and dependent-write
logic to create consistent copies of data. Dependent-write consistency ensures
transactional consistency when the applications are restarted at the remote location.
You can tailor your SRDF solution to meet various Recovery Point Objectives/
Recovery Time Objectives.
Using only SRDF, you can create complete solutions to:
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Create real-time (SRDF/S) or dependent-write-consistent (SRDF/A) copies at 1,
2, or 3 remote arrays.
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Move data quickly over extended distances.
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Provide 3-site disaster recovery with zero data loss recovery, business continuity
protection and disaster-restart.
You can integrate SRDF with other EMC products to create complete solutions to:
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Restart operations after a disaster with zero data loss and business continuity
protection.
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Restart operations in cluster environments. For example Microsoft Cluster Server
with Microsoft Failover Clusters.
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Monitor and automate restart operations on an alternate local or remote server.
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Automate restart operations in VMware environments.
SRDF operates in the following modes:
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Synchronous mode (SRDF/S) maintains a real-time copy at arrays located within
200 kilometers. Writes from the production host are acknowledged from the local
array when they are written to cache at the remote array.
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Asynchronous mode (SRDF/A) maintains a dependent-write consistent copy at
arrays located at unlimited distances. Writes from the production host are
acknowledged immediately by the local array, thus replication has no impact on
host performance. Data at the remote array is typically only seconds behind the
primary site.
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SRDF/Metro makes R2 devices Read/Write accessible to a host (or multiple
hosts in clusters). Hosts write to both the R1 and R2 sides of SRDF device pairs,
and SRDF/Metro ensures that each copy remains current and consistent. This
feature is only for FBA volumes on arrays running HYPERMAX OS 5977.691.684 or
higher. To manage this feature requires version 8.1 or higher of Solutions Enabler/
Unisphere for VMAX.
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Adaptive copy mode moves large amounts of data quickly with minimal host
impact. Adaptive copy mode does not provide restartable data images at the
Remote replication solutions
102 Product Guide VMAX 100K, VMAX 200K, VMAX 400K with HYPERMAX OS
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