John Dawes wrote:
Just that I understand correctly the following
If I define the vtoc (below) as
VTOC(0,1,29) -
INDEX(2,0,45)
The VTOC starts at cylinder 0 for 29 tracks
The INDEX starts at cylinder 2 for 45 tracks.
If for some reason the INDEX was set to 5,0,45. Would we have a
problem with response time? Is there a set rule that the INDEX must be
placed after the VTOC?
Currently there is absolutely no ROT regarding physical placement of
VTOC/VTOCIX/VVDS structures. Maybe except keeping everything at the
beginning of plate - just to have free space unfragmented. 3390 is pure
virtual thing nowadays.
Size can be discussed, especially if you use different models. Otherwise
it is a little bit pointless - you could save few hundreds cylinders
which is nothing.
IMHO the best ROT is one size for every model, with possible exception
for system volumes (SPOOL, PAGE).
KISS (Keep It Simple)
My $0.02
--
Radoslaw Skorupka
Lodz, Poland
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html
