poit...@pobox.com (Don Poitras) writes: > I don't know what IBM uses under the covers, but it's probably the same > thing that SAS/C did. Calculate the CCHHR from the byte offset and use > EXCP to read the block directly. No need to use POINT. FBS is guaranteed > not to have any short blocks, so the calculation is trivial.
aka logical FBA ... one of the reasons that it would tend to also make native FBA more efficient than emulated CKD (aka there haven't been any real CKD DASD manufactured for decades ... all current CKD DASD being emulated on physical FBA disks). -- virtualization experience starting Jan1968, online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
