Early 2001. Possibly included to run VSE in a z/OS address space to aid migration?
On Thu, Apr 21, 2022 at 6:52 PM PINION, RICHARD W. <[email protected]> wrote: > > Does anybody hear remember a software product from a Russian company that > allowed one to run Linux as > an address space under OS/390? If memory serves me correctly, I think this > was in the 1990's, possible early > 2000's. > > -----Original Message----- > From: IBM Mainframe Discussion List <[email protected]> On Behalf Of > Phil Smith III > Sent: Thursday, April 21, 2022 2:26 PM > To: [email protected] > Subject: Re: Use of zCX > > [External Email. Exercise caution when clicking links or opening attachments.] > > >It likes a LOT of real memory and it appears that the running instance > consumes the full amount of real memory allocated to it for the duration, > making it unavailable to zOS for paging or any other use. > > > > Well, sure-that memory use is Linux caching files in memory. This has all > been explored, analyzed, and solved under z/VM years ago; alas, z/OS doesn't > have the same kinds of controls, so it's going to be a problem with zCX until > and unless IBM adds some knobs. > > > > I'm with Dave Jones re "Where's the real value?" I remember when IBM first > proposed what became zCX, I asked what the point was. The answer I got was > "It's politically hard/impossible to get an LPAR created to run z/VM (not to > mention paying for z/VM) or to run Linux on the bare iron". A technical > solution to a political problem is painful to contemplate, but is sometimes > necessary, and it appears that's what zCX is. > > > > Running an entire operating system under z/OS that isn't acclimated to doing > so is inherently problematic. Things like Db2 and CICS have spent many, many > years being made into good z/OS citizens (OK, since CICS has always been > under z/OS and predecessors, that's obvious-but Db2 started as SQL/DS on VM). > Sure, IBM can make Linux behave under z/OS, but it's gonna take a while! And > the real value is still unclear to me, beyond the political hurdles. You're > sure not going to run hundreds of zCX containers under z/OS, I don't think, > as you can Linuxen under z/VM. > > > > TonyH: My information is that z/OS (MVS) only uses SIE for zCX, so I think > that's just two levels of SIE, which presumably/hopefully means vSIE, which > isn't that bad? > > > > ...phsiii (who spent four years doing Linux provisioning under z/VM at > Linuxcare and then a few years doing performance of Linux under z/VM, so > feels he has some qualifications to make the above assertions) > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send email to > [email protected] with the message: INFO IBM-MAIN > Confidentiality notice: > This e-mail message, including any attachments, may contain legally > privileged and/or confidential information. If you are not the intended > recipient(s), or the employee or agent responsible for delivery of this > message to the intended recipient(s), you are hereby notified that any > dissemination, distribution, or copying of this e-mail message is strictly > prohibited. If you have received this message in error, please immediately > notify the sender and delete this e-mail message from your computer. > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
