IBM Mainframe Discussion List <[email protected]> wrote on 06/07/2005 08:43:45 AM:
> I tried the D IOS,CONFIG(HSA) command and got a display that did not tell me > how big HSA is, but rather how much of HSA is available for adding more > configuration changes, such as more control units or subchannels > (more commonly > pronounced "devices"). > HSA stands for Hardware System Area, not Hardware Storage Area as I wrote in > my previous post. > The info on how many HSAs there are, how big each one is, and its beginning > address is all contained in the Service Call Control Block (SCCB), mapped by > SYS1.MACLIB(IHASCCB), and pointed to by CVTSCPIN. Service Call is a special > SVC (I think it is 122) in MVS that invokes the Diagnose instruction to read > hardware configuration info from the floppy disk. I learned about it by > perusing some RMF microfiche in 1987. > The SCCB also has info on various processor features that are installed, > such as the Performed Lock Operation (PLO) instruction. > I don't remember any software that displays the SCCB info. TMON/MVS might. > It should be easy to build code to find and display the contents or to find > it in a system dump that includes (E)CSA and (E)SQA. > Since the beginning address of each HSA is a four-byte value (SCCBAHSA), it > appears that all HSAs are allocated from the top down of the 2GB bar. D M=HSA displays any HSA ranges which are described in the SCCB. However, in LPAR mode, the SCCB for a logical partition describes only HSA ranges which are part of a storage increment in that zone. Usually there are none of those, so you will see D M=HSA IEE174I 17.06.09 DISPLAY M 715 HSA STATUS NO HSA IN MAIN STORE In the archives, see also: http://bama.ua.edu/cgi-bin/wa?A2=ind9902&L=ibm-main&P=R70841&I=1 http://bama.ua.edu/cgi-bin/wa?A2=ind9902&L=ibm-main&P=R71439&I=1 Jim Mulder z/OS System Test IBM Corp. Poughkeepsie, NY ---------------------------------------------------------------------- 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
