Quantum uses a variable block size for their dedup, which they claim gives them 
a much higher de-duplication ratio.  If you multiplex, the "natural boundaries" 
that quantum looks for get chopped up and that lowers the effectiveness of the 
de-duplication.

As for having problems with SSO and physical tape drives, I've talked to people 
about that myself, and have seen problems with it too.  99% of the time, it's 
fixed with firmware upgrades on the tape drives and/or the HBA's.

When I first started using the Quantum DXi's, I had problems when trying to do 
multiple reads, that might ( and I stress might ) have been caused by SSO, but 
after a firmware upgrade I haven't see any problems (so far).  It seems to be 
working fine, and the only good reason I've heard for not using SSO with it so 
far, is concerns about unnecessary complexity within the environment.  I 
however, think the extra complexity will help our environment obtain higher 
performance.

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