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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