re:
http://www.garlic.com/~lynn/2010n.html#62 When will MVS be able to use cheap 
dasd
http://www.garlic.com/~lynn/2010n.html#65 When will MVS be able to use cheap 
dasd

post from similar thread in this n.g. from 2007
http://www.garlic.com/~lynn/2007h.html#13 Question on DASD Hardware

with references to commodity disk having MTBF in the million-plus hrs
and google's (then) recently published study: "Failure Trends in a Large
Disk Drive Population" (invluving more than 100,000 drives).

there was similar but different study from the period that Google's
computing infrastructure was about 1/3rd of the cost (including doing
their own assembly, management, maintenance) compared to ordering from
brand name vendor ... by carefully studying which components to buy in
quantity and puttting them together themselves.

-- 
virtualization experience starting Jan1968, online at home since Mar1970

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