-- snip -- > > 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?
First, the VTOCIX in your example is much too large. It only needs to be a fraction of the size of the VTOC itself, since it is just an index into the real VTOC. The ICKDSF manual has some guidelines for sizing the VTOC/VTOCIX, but there is no penalty if the VTOCIX is too large, so with a 2 cyl VTOC, I would make the VTOCIX 1 cylinder INDEX(2,0,15). -- snip -- One of the advantages of oversizing the VTOC/VTOCIX is that when you use a fine product like FDRPAS to move devices to a larger DASD geometry (eg. 3390-9 to 3390-54), you don't have to worry about enlarging the VTOC/VTOCIX. I'm not advocating making them extreemly large, but it was very convienient for our last migration. John ---------------------------------------------------------------------- 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
