Access "EMC Launches Space-Saving Copy Option for Symmetrix"
This article is part of the Vol. 2 No. 5 July 2003 issue of Evaluating the benefits of IP SANs
AEMC Launches Space-Saving Copy Option for Symmetrix favorite knock against high-end enterprise arrays such as EMC's Symmetrix, Hitachi Data Systems' (HDS) Lightning and IBM's Shark is that it costs an arm and a leg to protect them because the point-in-time cloning software they employ requires a one-for-one mirror of hardware and disk capacity. Now EMC has added copy-on-write snapshot software to the list of options you can purchase for Symmetrix. Called EMC Snap for Symmetrix, the software uses only about 30% of the disk space required to make a copy with TimeFinder, EMC's point-in-time cloning software. It works by making a pointer-based virtual copy of a volume, to which it subsequently writes only those blocks of data that are about to be changed in the physical base volume. But snapshots aren't for every environment, says EMC's Chuck Hollis, vice president of storage platform marketing. While snapshots cost less in terms of disk space, the snapped image relies on the same underlying physical block data, which can cause a performance hit. For example, ... Access >>>
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