[email protected] (Paul Gilmartin) writes: > And somewhere in there, there was something like VM/XA/SF (System > Facility), intended to allow virtual machines for development and > testing, but not to support emigration of the OS workload as happened > in the VSCR crisis.
re: http://www.garlic.com/~lynn/2012g.html#17 Co-existance of z/OS and z/VM on same DASD farm the POK group did VMTOOL that was supposed to be for internal use only for MVX/XA development. However, eventually the decision was made to release it as VM/SF ... for customer aid in MVS to MVS/XA conversion. There was lots of internal politics. Internally, vm370 had been ported and running in 370/XA support ... had much better function, features, performance, reliability, etc than VM/SF. However, there was growing politics to turn VM/SF into VM/XA ... even tho the vm370 solution running in XA-mode was significantly better. Part of the issue was that VM/SF was from the POK "high-end" group ... which was responsible for XA. vm370 was still from the endicott mid-range group ... which had less political clout. old post with mention of vm/811 (aka vm/sf ... XA was referred to as "811" internally for the nov1978 date on lots of the XA architecture documents). http://www.garlic.com/~lynn/2011b.html#70 VM/370 3081 and discussion (with old email) about vm370 running in xa-mode http://www.garlic.com/~lynn/2011c.html#87 A History of VM Performance with regard to "FBA" ... I've mentioned before that I was told that it would cost $26M to release MVS support for FBA (fixed-block archtecture, at the time 3370s) ... even if I gave the MVS group fully integrated and tested code. The $26M was just for education and documentation changes. To justify the $26M, I had to show incremental new disk sales (on the order of ten times the cost ... i.e. around $300M); and they were claiming that they were making & selling as much disks as possible ... and if MVS had FBA support ... customers would just switch to having the same amount of FBA as CKD. I wasn't allowed to use business justification for drastically reduced lifetime costs ... I had to have business justification showing additional new sales. As as been pointed out ... current disks are all FBA ... there haven't been real CDK disks made for decades. misc. past posts mentioning DASD, CKD, FBA, multi-track search, etc http://www.garlic.com/~lynn/submain.html#dasd -- virtualization experience starting Jan1968, online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
