My documentation shows there are up to 16 item R/W maps per label, starting
on label 3.  So for 10 items, there is a single label, for 30 items, there
are 2 labels.


Each item r/w map requires 8 words (2 bytes per word), and a label is 128
words long.  So the formula is no-of-lbls:= (no-of-itms*8)/128.

The set r/w map, as you say, will start on the label boundary after the item
r/w table, which again, always starts on label 3.

So in the case of 30 items, the set r/w map will start on label 5.

I hope I read you question properly.

Denys

-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]] On Behalf
Of Brian Donaldson
Sent: Monday, February 06, 2006 10:02 AM
To: [log in to unmask]
Subject: [HP3000-L] Image/3000 Handbook Question/Problem

Image/3000 Handbook Chapter 4, pages 39/40

Data items read/write security bitmap table starts at label 3.

Per the calculation below, "n" would yield a result of 1. The book states on

page 40 (chapter 4) that "this table starts in Label 3 and may extend to
Label 
n

Calculation is "n" = (number of items + 15) + 2
                              _____________________ 
                                             16

and "n" is between 3 and 18

Data sets read/write security bitmap table starts in the first label after 
data items read/write security bitmap table...

Seems nice and simple...

Scenario:

Let's say there are 10 items in the base. Per the above calculation "n"
would 
yield
a result of 1. So according to the book, we start and label 3 and extend to 
label 1.
I don't think so....

Let's say there are 30 items in the base. Per the above calculation "n"
would 
yield
a result of 2. So according to the book, we start and label 3 and extend to 
label 2.
I don't think so....

Labels 1 and 2 contain the password list table!

It would seem to me that "n" is the number of labels to read starting at 
label 3, so labels
3 and 4 would store the data items read/write security bitmap table. The
data 
sets read/write security bitmap table would therefore start in label 5.

In one particular base I am working with, this calc is telling me that the 
sets extend from label 6 to label 7. When I do a :listf,-3 on the root file
of 
this base it tells me the number of labels and max number of labels is SIX
(6)
....

The reason I am bringing this up is that my PM program interrogating the
root 
file for this data isn't giving me exactly what I want/need. The call to 
FREADLABEL is failing sometimes and therefore not loading the security
bitmap 
table I thought it was!

Any help on this matter would be very much appreciated.

TIA,
Brian Donaldson. 

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