Paul writes,
> Do you mean 20 extent blocks or 20 extents?  There is a limitation on
 
extents...based on memory of old conversations and pre-non-disclosure
knowledge.
 
> Wait.  768 pages is indeed .75 MB.  Except the very first extent is 769
> pages (one more page for the header), all other extents are .75MB.
 
768 * 4096 = 3145728 (all in decimal)
 
(see attached example)
 
BTW, that's a lot more than .75 MB ... it's 3 MB.
 
> Label table is very picky about this.  Everytime the label table expands,
> it want EXACTLY .75MB.
 
Here's an example...I have a label table with 1 extent, and about 600
unused entries...so I created a bunch of files and looked again...2 extents,
and the second one is 3 MB.
 
I used no programs to verify this...just debug and watching the #extents
in the Label Table's extent entry block.
 
> It is indeed possible to see label table extent size differ than .75MB.
> It is an indication some one or program had played with the label table.
 
well, at least one machine has a freshly INSTALLed system, with no
utility of any kind run on it (LPS, Bradmark, or HP!)...and 3 MB
label table extents.
 
> Label table is just a file.  If someone is reading or writing it beyond
> its current EOF, it will cause an extent fault and produce a different
> sized extent!  One quick way to do it without even knowing is to look
> at the label table beyond EOF with DEBUG!  Don't try this at home though,
> it waste disk space and slow down bootup time!
 
Yep.
 
 
------------------------------cut here-----------------------------
 
De-Frag/X  B.xxx (run on  7/29/96 12:28:40.1)
Copyright (c) 1993 Lund Performance Solutions
 
...
 
De-Frag/X> de ldev all 1
 
-------------------------------------------------
Ldev 1, entry# 1 --> $11.$600  =  $LABEL_TABLE
 
File: $LABEL_TABLE  (2 extents)
 
   Ldev   Disk Page#   # Pages  File Page #
   ----   ----------   -------  -----------
       1         133       769            0
       1      26,482       768          769
 
   # extents in file:            2
   # pages in file:   1,537 pages;  6.0 MBs
% fragmented:    0.1
...
 
 
from Debug/iX:
 
 
 
fv 11.600 "t_file_label_entry,true"
 
RECORD
      VERSION            : 10
      LT_ENTRY_TYPE      : LT_FILE_LABEL
      PHIL               : 0
      FCTS0              : b0
      FCTS1              :
            DAY    : 88
            HOUR   : 2
            MINUTE : 4
            SECOND : a
            TENTHS : 1
      LAB_ENTRY_OFFSET   : 600
      EXTENT_BLK_OFFSET  : 800
      INTERVAL_TIMER     : 1c6b6dd
      II_FLAB_EXT_OFFSET : 0
...!!!
 
 
fv 11.800 "t_extent_block_entry,true"
 
RECORD
      VERSION                : 10
      LT_ENTRY_TYPE          : LT_EXTENT_BLOCK
      NUM_EXTENTS_IN_BLK     : 2
      FCTS0                  : b0
      FCTS1                  :
            DAY    : 88
            HOUR   : 2
            MINUTE : 4
            SECOND : a
            TENTHS : 1
      PARENT_LABEL_OFFSET    : 600
      PREV_EXTENT_BLK_OFFSET : 0
      EXTENT_BLOCK           :
         [ 1  ]:
            EXTENT_SECTOR_ADDR : 850
            SECTORS_IN_EXTENT  : 3010
            VOL_SET_INDEX      : 1
            FILE_SECTOR_OFFSET : 0
         [ 2  ]:
            EXTENT_SECTOR_ADDR : 67720
            SECTORS_IN_EXTENT  : 3000
            VOL_SET_INDEX      : 1
            FILE_SECTOR_OFFSET : 3010
         [ 3  ]:
            EXTENT_SECTOR_ADDR : 0
            SECTORS_IN_EXTENT  : 0
            VOL_SET_INDEX      : 0
            FILE_SECTOR_OFFSET : 0
...
 
= 3010*#256, #
#3149824
 
--
Stan Sieler                                          [log in to unmask]
                                     http://www.allegro.com/sieler.html