>>Have you considered EMC DLm or Bus-tech MDL (EMC owns Bus-tech now). 
I have not worked with MDL (which I think is more of a "small shop" 
solution),
but I have with DLm.    I've also worked with VSM, but it was always 
>>backed by physical tape.   BTW, the vendor is Oracle now, not Sun.


So my understanding is the MDL was the HDS version of the DLM - the 
Bustech appliance ahead of HDS storage.  We have an HDS MDL which uses an 
AMS2500 for back-end storage.  It's also my understanding that the MDL is 
no longer available as such.  HDS now sells the Falconstor's VTL instead.

I would consider the DLM & the MDL to be roughly equivalent.  We are very 
happy with the performance of the MDL.
dd keller





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