DAG Configuration Question

Hey guys
I have 3 Exchange 2013 servers in one site and 3 in another. I currently have them tied into one large DAG and keep a primary plus 2 copies of each database within my DAG. My question is, is this a valid configuration - to have a DAG that doesn't
necessarily hold a database copy?
Cheers,
Joe

So I have six nodes in the DAG but for each database only three copies (including my primary), therefore there are 3 remaining nodes that are participating in my DAG without a copy for that database. I suppose my question is: is this valid or should I be
creating a DAG specifically for each database and copy relationship (no idle nodes). I think the way I have it set up now is fine, I just wanted to make sure I wasn't going against best practice.

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    2) I would like to know if my jtag-configuration logic (at FPGA-1) will have mistakes, is it possible to damage fpga-2  by sending wrong sequences of bits during configuration it "on fly"?
     

    XSVF is something like taking a straight-forward iMPACT programming process, and then recording the transitions of the JTAG signals.  Then what you do is to "play back" the recording to make the same thing happen within your target system.  Pretty much anything you do in iMPACT including indirect flash programming (SPI or BPI) can be converted into XSVF.
    You could also roll your own JTAG conversion code, but I think that will take a lot more effort.  I would not be too worried about damaging the FPGA, however.  Typically errors in the configuration process are detected as CRC errors and prevent the part from running bad codes.

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