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Hi Stefanj,
my request stems from a real case, in which the customer uses an excel sheet to maintain the state of used space in each of his DS8000s. Based on the available space (expressed in extents), it is then decided how many logical volumes can still be defined without exceeding the residual capacity.
In the DS8000 it is essential to know the number of extents if you work in a mainframe environment (CKD), because volumes are not allocated in GiB as in an open environment where an extent is equivalent to 1 GiB (or 16 MiB in case of small extents). In the mainframe environment, an extent is equivalent to 1113 cylinders (or 21 cylinders in the case of small extents). I hope I have clarified.
Extents come in two different sizes, so would probably also need to have the extent size available.
I don't quite understand what advantage it is to see "number of extents" over seeing the actual capacity value, if, as you say, the user still has to do additional computations with that. Whatever the user is trying to figure out, wouldn't it be better to see THAT value in the report, rather than a "number of extents" that needs to be processed further?