So doesn't the DMX initially offer lower total maximum capacity than previous Symmetrix models? No, says Tucci: Total usable capacity with the Symmetrix 8830 with mirroring turned on was 34 Tbytes. While it does offer less raw capacity than the Symm 5, the DMX line provides more total usable capacity because it now supports parity RAID, EMC maintains.
As far as the threat that the DMX 800 -- the first rack-mountable, modular Symmetrix from EMC -- would be cannibalized by the Clariion CX 600, Tucci said there was enough differentiation that it wouldn't be an issue: "When I talk to customers they have this pretty square in their minds."
[Ed. note: Pause the tape here. We thought EMC was supposed to be in the process of transforming into a software company? Guess not really.]
Other improvements with the DMX: EMC says it's made high availability a top priority and that it has already logged 3 million hours of runtime on the DMX systems without a failure. Among other enhancements, the DMX systems isolate components so that if one of them fails it doesn't affect other elements.
Furthermore, according to EMC, right out of the gate the DMX works with all the existing Symmetrix software, including Symmetrix Data Replication Facility (SRDF). "Typically when new architectures are developed, you have to make a brutal tradeoff -- either move to a new system but leave software behind" or vice versa, Donatelli said. "We're able to move all the customers' software forward seamlessly."
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