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FlashCopy
Version 2 introduced the ability to flash individual data sets and then added support for “consistency groups”. FlashCopy consistency groups can be used to help create a consistent point-in-time copy across multiple volumes, and even across multiple ESSs, thus managing the consistency of
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Version 1 of FlashCopy had limitations however. Although the copy or “flash” of a volume occurred instantaneously, the FlashCopy commands were issued sequentially and the ESS required a brief moment to establish the new pointers. Because of this minute processing delay, the data residing on two
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The first implementation of FlashCopy, Version 1 allowed entire volumes to be instantaneously “copied” to another volume by using the facilities of the newer
Enterprise Storage Subsystems (ESS).
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FlashCopy consistency groups are used in a single-site scenario in order to create a time-consistent copy of data that can then be backed-up and sent off site, or in a multi-site
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implementation providing similar function was branded as ShadowImage. Using either implementation, the copies are immediately available for both read and write access.
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series (formerly known as XRC or eXtended Remote Copy) also creates consistency groups to asynchronously mirror disk data from one site to another over any distance .
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feature supported on various IBM storage devices that made it possible to create, nearly instantaneously, point-in-time
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for ESS implementation to force time consistency at the remote site.
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volumes that were FlashCopied are not exactly time consistent.
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185:"IBM adds teeth to shark enterprise storage system"
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38:Relevant discussion may be found on the
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