EMC VMAX 100K, Руководство по эксплуатации продукта

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SRDF and TimeFinder
TimeFinder is a local replication solution that non-disruptively creates point-in-time
copies of critical data. You can configure backup sessions, initiate copies, and
terminate TimeFinder operations using host-based TimeFinder software.
TimeFinder is tightly integrated with SRDF solutions. You can use TimeFinder and
SRDF products to complement each other when you require both local and remote
replication. For example, you can use TimeFinder to create local gold copies of SRDF
devices for recovery operations and for testing disaster recovery solutions.
The key benefits of TimeFinder integration with SRDF include:
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Remote controls simplify automation—Use EMC host-based control software to
transfer commands across the SRDF links. A single command from the host to the
primary array can initiate TimeFinder operations on both the primary and
secondary arrays.
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Consistent data images across multiple devices and arrays—SRDF/CG guarantees
that a dependent-write consistent image of production data on the R1 devices is
replicated across the SRDF links.
You can use TimeFinder/CG in an SRDF configuration to create dependent-write
consistent local and remote images of production data across multiple devices and
arrays.
Note
The SRDF/A single session solution guarantees dependent-write consistency across
the SRDF links and does not require SRDF/CG. SRDF/A MSC mode requires host
software to manage consistency among multiple sessions.
Note
Some TimeFinder operations are not supported on devices protected by SRDF. For
more information, refer to the
Solutions Enabler SnapVX Product Guide .
R1 and R2 devices in TimeFinder operations
You can use TimeFinder to create local replicas of R1 and R2 devices. The following
rules apply:
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You can use R1 devices and R2 devices as TimeFinder source devices.
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R1 devices can be the target of TimeFinder operations as long as there is no host
accessing the R1 during the operation.
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R2 devices can be used as TimeFinder target devices if SRDF replication is not
active (writing to the R2 device). To use R2 devices as TimeFinder target devices,
you must first suspend the SRDF replication session.
SRDF/AR
SRDF/AR combines SRDF and TimeFinder to provide a long-distance disaster restart
solution. SRDF/AR can be deployed in 2-site or 3-site solutions:
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In 2-site solutions, SRDF/DM is deployed with TimeFinder.
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In 3-site solutions, SRDF/DM is deployed with a combination of SRDF/S and
TimeFinder.
Blended local and remote replication
160 Product Guide VMAX 100K, VMAX 200K, VMAX 400K with HYPERMAX OS