Gregg, you are making this up a little - data storage is out while data access is in SOA at the utility service level. Data storage is not a business thing but only implementation/operational support to the business. Rooms of folders or rooms of magnetic tapes do not have any business functionality; business services depend on the storage a great deal but it does not change the business meaning of the storage.
How implement quick access to needed data is pure technical task and I do not see reasons why it must be resolved exclusively by services. Nonetheless, I, probably, have to correct myself and say that data storage should be outside of scope of SOA business services. - Michael ________________________________ From: Gregg Wonderly <[email protected]> To: [email protected] Sent: Monday, April 13, 2009 11:18:16 PM Subject: Re: [service-orientated-architecture] Joe on Microsoft's combination of SOA & Storage Michael Poulin wrote: > I still think that data storage should be outside of SOA scope: business > services do not care where data comes from whilst the data is of good > quality. I think this is an interesting opening to some more discussion of what matters in what you call SOA and what doesn't. Data storage has an important aspect to it, and that is the storage technology and the retrieval technology. When you include technology, there is an interface involved, and that interface is important to the overall usability. For example, let's say we have three nice middle aged adults in your business that are responsible for data storage. If they decide that they want to keep everything printed on paper, and anytime you need data, you have to find one of them, have them look through the 3 rooms of file cabinets to find what you need, and then transcribe it into the format that you need it, would that be just as acceptable to you as a database system access using ONLY oracle PSQL, or just as acceptable as an HTTP based service? What if there core of your SOA was CORBA, JMS or Jini based? Would you still "consider" data storage to be "outside of SOA scope"? More directly, how would you decide what was acceptable performance of your system if the data storage decision didn't play into the architecture portion of your SOA? Gregg Wonderly
