> I am issuing DIAGNOSE 8 on my z/os image under VM (z/vm) to do a > QUERY VIRTUAL DASD. It works?up to a certain point: > > The QUERY VIRTUAL DASD command returns (for me) 38617 (decimal) > bytes, according to the CC=0 after the DIAGNOSE 8 command. My > buffer is large enough to accommodate this. I have tried several > different sub-pools of storage. I PGSER FIX the buffer pages. I do > a SYSEVENT DONTSWAP. I do a LRA of the virtual address of the start > of the buffer. The DIAGNOSE completes CC=0. But, in my buffer, I am > only seeing the first page (4095) bytes of the output. > > My question: I don?t see any documented restriction in the VM > manuals that limits the DIAGNOSE 8 output buffer to 4K (rather the > limitation is the architecture limit depending on your amode.) The > z/vm manuals say the buffer can cross page boundaries. So is there > a way to force the real storage addresses of the page-fixed pages to > be consecutive? According to the diagnose 8 doc., the buffer needs > to be in guest-real storage, hence the LRA. And it is working for > the first 4k page.
RSM internally manages double frames (used for access lists, and before z/Architecture, for segment tables) and quadframes (used for segment tables and region tables). There are no external interfaces for double frames or quadframes. There is IARV64 GETSTOR with TYPE=FIXED and PAGEFRAMESIZE=1M. Jim Mulder z/OS Diagnosis, Design, Development, Test IBM Corp. Poughkeepsie NY ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
