9840C drives



There is a host in which we exchange data that is converting to 9840C drives.
We are looking at attaching two 9840C drives to z/OS 1.7 as 3590s. I am
getting quite a bit of mixed information. This is how I see it working to this
point:

The non-IBM host will see the drives as 9840C and that is the mode of the
drive. z/OS will see the drives as 3590s and that will be the mode of the drive.
I have been informed that the microcode within the 9840C is "smart" enough
to realize that the data has been written in 9840C mode and must
be "converted" to 3590 mode on the z/OS side. I was informed that this
replaced the need for a 9840 UIM to be loaded on z/OS (so the 9840C could
be defined to z/OS as 9840s).

I cannot find any proof of this concept and am somewhat concerned about
connecting the 9840Cs (to z/OS) and praying that this arrangement works.

Any information, comments are welcomed.

Thank you

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