What is the maximum value for RBA

senthils · Posted: Mon Nov 30, 2009 11:23 am

Hi,

Does RBA value for an ESDS has a maximum limit or is it just limited by the space allocated to the file?

expat · Posted: Mon Nov 30, 2009 2:37 pm

Why do you believe that there is a limit ?

senthils · Posted: Mon Nov 30, 2009 3:31 pm

I am facing a situation in which the we are holding the RBA value in S9(09) BINARY. Since S9(9) BINARY can hold only a maximum value of +2147483648 is there a possibility of the RBA going beyond this value?

enrico-sorichetti · Posted: Mon Nov 30, 2009 3:41 pm

RBA are by UNSIGNED, for 32bits tha max RBA is x'FFFFFFFF'
why would You want to read a negative RBA

for extended vsam the rba is 64 bits...

investigate accordingly

anyway a signed declaration fo an RBA is just plain wrong

PeterHolland · Posted: Mon Nov 30, 2009 3:41 pm

That could be a problem with 1 byte records.

senthils · Posted: Mon Nov 30, 2009 4:15 pm

We used signed variable beacause it is a standard we had to follow. And the problem we face is is due to the fact that the RBA goes beyond +2147483648 and due to the restriction of S9(9) BINARY the value turns to negative.

Thanks for your replies. I will modify the program logic accordingly.

PeterHolland · Posted: Mon Nov 30, 2009 4:37 pm

So the maximum RBA = 4294967295 (FFFFFFFF).
You could calculate how many records fit into that, given
the record length and the track capacity of the drives
you put your data on.

As for extended vsam i remember vaguely that is only for KSDS vsam datasets.