Re: determining a tape's blocksize on a *NL tape

[Pat Barber <mboceanside@xxxxxxxxxxxxxxxx>]

Unless MVS has changed a WHOLE lot, a block size of 0 is not possible.

You can have block=recsize, which is effectively NO blocking, but
ZERO is not a option. I make a "BIG" assumption that this tape was
created on a IBM mainframe.

You should be able to dump the tape and figure out blocksize....


"Prowak, Dave" wrote:
>
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> Hi,
>
> Here's the short story - A procedure to load recs from a tape went down
> recently.
> The provider of the tape (mainframe) changed the blocksize from 128 to 0.
> With a blocksize of 0,
> the program determines the optimum blocksize given a rcdlen of 128.
>
> It's a no-label tape.  How do I determine the blocksize used?