On Mar 29, 2006, at 3:33 PM, Bruce Black wrote:
Just a point of curiosity here... I have been out of touch on this
and my knowledge maybe out of date.
With the new larger tapes there maybe more than the 255 file
"limit"? When was DFHSM (for that matter TMS) updated to allow for
these
Longer more dense tapes?
I don't believe that the file number was ever limited to 255. The
field in the HDR1 label is 4 digits, from 0001 to 9999, and I
believe it has always been that way.
The field containing the number of blocks in a file was increased,
from 6 digits to 10, some years ago
Bruce,
I remember trying to create a volume that had more than 255 files on
it. I ran into issues. This was approximately 10 years ago.
I remember vaguely looking through HSM's CDS's a while ago and seeing
a field that was 1 byte that indicated the relative file on the tape.
Again this was a while ago (before the huge capacity drive became
available). I thought that HSM used that field to skip to the file
where the migrated was on the real of tape.
Both of the above are remembrances so I could be incorrect. I do
remember coming up with a message (from the converter) that 255 was
the max, IIRC.
Ed
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