We're currently about 2 weeks in to eval of a 580. I've been really impressed
with the compression so far. We've been doing test backups of our 2.5Tb SAP
instance - after the first backup the post compression size of that was 500Gb.
We've since been throwing a mix of data at it, from Windows file server,
Exchange, misc Oracle and SQL, and we're up to about 10 to 1 compression.
My biggest issue with the device is the hard limit on how much data it can
process. No matter what I/O options you go with - i.e. VTL or GigE - you'll
always be limited to 220Mb per second. No matter how fast you get the data
there, that's as fast as the DataDomain box can process it. Getting a tape
based solution to match these speeds is quite easy - a properly configured
fibre based tape library solution with, say 8 LTO3 drives, could easily handle
500+Mb per second. Obviously comparing the two is kind of an
apples-and-oranges thing, but what I'm saying is that I don't like having to
max out a products capabilities just to get it to work as I want. I'd rather
have it be able to handle whatever I throw at and have extra capacity to spare.
Especially for the price tag that the DataDomain devices carry.
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