On Tue, 18 Oct 2011 11:35:04 -0500, J Ellis <[email protected]>
wrote:
>we have arrived at several different answers for this (what I think) is a
>relatively simple question. More opinions/facts are invited---
>
>for the DS8800, how many bytes in ESQA does each 3390B & 3390A take
Good question. I wonder if it is documented somewhere. The best thing I can
offer is a statement in the HCD manual:
"The size of a UCB is dependent on the device type. For example, a DASD UCB
defined below 16 megabytes has approximately 128 bytes below 16 megabytes."
The size of the prefix extension is not included because it already exists above
16 megabytes."
So I would say approximately 128 bytes each + the prefix. Looking at
SYS1.MACLIB(IEFUCBOB) has some good information, including this:
SIZE:
Device Class Extension : 0 to 256 bytes
UCB Common Extension : 32 bytes for all devices
UCB Prefix Stub : 8 bytes for all devices
UCB Common Segment : 24 bytes for all devices
UCB Device Dependent Segment: 0 to 24 bytes for below
16Mb devices. No limit on the size for above 16Mb devices
Device Dependent Extension : 0 to 40 bytes
I know there are some people on this list that can give a better answer
though...
Mark
--
Mark Zelden - Zelden Consulting Services - z/OS, OS/390 and MVS
mailto:[email protected]
Mark's MVS Utilities: http://www.mzelden.com/mvsutil.html
Systems Programming expert at http://expertanswercenter.techtarget.com/
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