Is there a rule of thumb that I can use to code the parms when initializing a
volume via ICKDSF. I am not sure what I should use when initing the following:
3380 model E
3380 model K
3390 model 2
3390 model 3
3390 model 9
Below is what I am using to init a 3390-3 for example:
INIT -
UNITADDRESS(A0FC) -
VOLID(PROD65) -
VTOC(0,1,29) INDEX(2,0,45) -
VERIFY(VEA0FC)
You still have 3380s?
There is no good ROT, it depends on how the volume is going to be used.
If it will be mostly medium to large sized datasets, then the VTOC
doesn't need to be more than a few cylinders. You get 50 DSCBs per
VTOC track on a 3390 and 53/track on a 3380 (remember that VSAM KSDS
requires 2 DSCBs per volume), so 2 cylinders gets you about 1500
datasets or components, 5 cyls gets 3750, etc. The VTOCIX only needs
to be a fraction of the size of the VTOC (it is just an index into the
VTOC) so if the VTOC is a few cylinders, the VTOCIX needs to be a
cylinder or less in size.
If the volume is going to contain many small datasets, then the VTOC and
VTOCIX need to be larger.
There are some penalties if the VTOC is too large (sometimes the entire
VTOC must be read) so you don't want to make the VTOC arbitrarily large.
Appendix C of the ICKDSF manual has guidelines for VTOC and VTOCIX size,
including the maximum size for each device type (assuming that the
volume consists entirely of 1-track datasets!).
--
Bruce A. Black
Senior Software Developer for FDR
Innovation Data Processing 973-890-7300
personal: [EMAIL PROTECTED]
sales info: [EMAIL PROTECTED]
tech support: [EMAIL PROTECTED]
web: www.innovationdp.fdr.com
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